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17800.711.4939www.directmetals.comBAR GRATINGGlossaryTerminologyANCHOR - A device by which grating isattached to its supports. BAND - A at bar welded to the end of a grating panel or along the line of a cutout and extending neither above nor below the bearing bars. Load-Carrying Band: A band used in a cutout to transfer the load from unsupported bearing bars to the supported bearing bars. Trim Band: A band which carries no load but is used chiey to improve appearance. BEARING BARS - Load-carrying bars made from steel strip, slit sheet or rolled or extruded aluminum, and extending in thedirection of the grating span. BEARING BAR CENTERS - The distance center to center of the bearing bars. CARRIERS - Flats or angles, which are welded to the grating panel and nosing of a stair tread, and are bolted to a stair stringer to support the tread. CLEAR OPENING - The distance between faces of bearing bars in a rectangulargrating or between a bent connecting bar and a bearing bar in a riveted grating. CROSS BARS - The connecting bars made from steel strip, slit sheet, rolled bars, or rolled or extruded aluminum, which extend across the bearing bars, usually perpendicular to them. They may be bent into a corrugated or sinuous pattern where they intersect, the bearing bars are welded, forged, or mechanically locked to them. CROSS BAR CENTERS - The distance center to center of the cross bars. CURVED CUT - A cutout following a curved pattern. CUTOUT - An area of grating removed to clear an obstruction or to permit pipes, ducts, columns, etc. to pass through the grating. ELECTRO-FORGED - A process combining hydraulic pressure and heat fusion to forge bearing bars and cross bars into a panel grid. FINISH - The coating, usually paint orgalvanizing, which is applied to the grating. FLUSH TOP GRATING - A type of pressure-locked grating, in which the cross bars and bearing bars are in the same plane relative to the top surface of the grating. GRATING - An open grid assembly of metal bars, in which the bearing bars running in one direction are spaced by rigid attachment to cross bars running perpendicular to them, or by bent connecting bars extending between them. HINGED PANELS - Grating panels which are hinged to their supports or to other grating parts. I-BAR - An extruded aluminum bearing bar having a cross sectional shape resembling the letter “I”. LENGTH - The dimension of a grating panel measured parallel to the bearing bars. Also referred to as span. LOAD-CARRYING BAND - see Band. NOSING - A special L-section member serving as the front or leading edge of a stair tread or of grating at the head of a stair. PRESSURE-LOCKED GRATING - Grating in which the cross bars are mechanically locked to the bearing bars at their intersections by deforming orswaging the metal. RADIALLY CUT GRATING - Rectangular grating which is cut into panels shaped as annular segments for use in circular or annular areas. RETICULINE BAR - A sinuously bent connecting bar extending between two adjacent bearing bars, alternately contacting and being riveted to each. RIVET CENTERS - The distance center to center of rivets along one bearing bar. RIVETED GRATING - Grating composed of straight bearing bars and bent connecting bars, which are joined at their contact points by riveting. SERRATED GRATING - Grating which has the top surfaces of the bearing bars, cross bars or both notched. SPAN OF GRATING - The distancebetween points of grating support or thedirection of the dimension. Also referred to as length. STRAIGHT CUT - That portion of the cut edge or cutout of a grating, which follows a straight line. SWAGING - A method of altering the cross-sectional shape of a metal bar by pressure applied through dies. TOEPLATE - A at bar attached against the outer edge of a grating or rear edge of a tread, and projecting above the top surface of grating or tread to form a lip or curb. TREAD - A panel of grating having carriers and nosing attached by welding, and designed specically to serve as a stair tread. WELDED GRATING - Grating in which the bearing bars and cross bars are joined at their intersections by a weld. WIDTH - The overall dimension of a grating panel, measured perpendicular to the bearing bars and in the same direction as the cross bars.This catalog uses a form of the NAAMM alpha-numeric designation for bar spacing and manufacturing identication. The rst number signies center-to-center bearing bar spacing in 1/16ths of an inch*. A letter designates method of manufacture. The last number details center-to-center cross bar spacing in whole inches (usually 4" or 2")or rivet spacing (usually 3-1/2", 5" or 7").Methods of manufacturing and their letter designations used in this catalog include: SG ........ Swaged Rectangular Bar SGF ...... Swaged Flush Top SGI ....... Swaged I-Bar W .......... Welded Steel R .......... Riveted (Steel) AR ........ Riveted (Aluminum)FOR EXAMPLE: 19-W-4 – Bearing Bars 19/16" (or 1-3/16") c.c. – Welded Steel Construction – Cross Bars 4" c.c. 15-SGI-2 – Bearing Bars 15/16" c.c. – Swaged I-Bar – Cross Bars 2" c.c.Other Bearing Bar Spacings commonly used throughout the industry are designated thus: 38-W-4 (or 2) Bearing Bars 38/16" c.c. (2-3/8" c.c.) 30-W-4 (or 2) Bearing Bars 30/16" c.c. (1-7/8" c.c.) 22-W-4 (or 2) Bearing Bars 22/16” c.c. (1-3/8” c.c.) 11-SG-4 (or 2) Bearing Bars 11/16" c.c. 7-SG-4 (or 2) Bearing Bars 7/16" c.c. 18-R-7 (or 3-1/2) Bearing Bars 18/16" face-to-face (1-1/8")* 37-R-5 Bearing Bars 37/16" face-to-face (2-5/16")* 12-R-7 (or 3-1/2) Bearing Bars 12/16" face-to-face (3/4")**Note: Riveted grating marking indicates space between bearing bars.

26www.directmetals.com800.711.4939BAR GRATINGHeavy Duty Welded Steel 19-W-4/19-W-21 x 1/41 x 3/81 - 1/4 x 1/41 - 1/4 x 3/81 - 1/2 x 1/41 - 1/2 x 5/161 - 1/2 x 3/81 - 3/4 x 1/41 - 3/4 x 3/82 x 1/42 x 5/162 x 3/82 - 1/4 x 1/42 - 1/4 x 3/82 - 1/2 x 1/42 - 1/2 x 5/162 - 1/2 x 3/83 x 1/43 x 5/163 x 3/83 x 1/23 - 1/2 x 1/43 - 1/2 x 3/83 - 1/2 x 1/24 x 1/44 x 5/164 x 3/84 x 1/24 - 1/2 x 1/44 - 1/2 x 3/84 - 1/2 x 1/25 x 1/45 x 5/165 x 3/85 x 1/25 - 1/2 x 1/45 - 1/2 x 3/85 - 1/2 x 1/26 x 1/46 x 5/166 x 3/86 x 1/29.7114.0111.8717.2314.0117.2320.4616.1623.6718.3022.6026.8920.4630.1222.6027.9633.3428.3234.7641.2054.0932.6147.6562.6736.9145.5054.0971.2641.2060.5379.8545.5056.2466.9788.4449.7973.4297.0354.0966.9779.85105.620.4210.6320.6580.9870.9471.1841.4211.2891.9341.6842.1052.5262.1323.1972.6323.2893.9473.7894.7375.6847.5795.1587.73710.3166.7378.42110.10513.4738.52612.78917.05210.52613.15815.78921.05212.73719.10525.47315.15818.94722.73630.3150.2110.3160.4110.6170.7110.8881.0661.1281.6921.6842.1052.5262.3983.5973.2894.1124.9345.6847.1058.52611.3689.02613.53918.05213.47316.84220.21026.94719.18428.77638.36726.31532.89439.47352.63035.02552.53870.05145.47356.84168.20990.94579101413161917252228332841344250496067*78*6685*9685*95*96969696969696969696969696969696688101011131217151821182622273130374457405875*51637591*6494*967896969694969696969696799121113141418161922192622273130364355395672*50617288*619096759296968996969696969691112141416181721202326233127313635424961*456476*577080*92*7095*968596969696969696969696Bar Size,Inches Wt.**Lbs.Sq. FtSx**, in3Ft. Widthlx**, in4Ft. WidthSection Properties Maximum Safe Clear Span, Inches-Partially Distributed Load1 Ton 3 Ton 5 Ton H15/H20BBSizeThru2 - 1/2"4"cc2"cc72%65%67%61%62%56%74%70%69%65%64%60%54%51%4"cc2"cc3" to 6"CBCtrs1/4" 5/16" 3/8" 1/2"Bearing Bar Thickness% Open Area**Span limited to 1/400 of span = Deection. ** Based on 10.105 bars/ft of grating width. Bearing bars 1-3/16" c.c. When serrated grating is specied, the depth of grating required for a specic load will be 1/4" greater than that shown in these tables. Weights shown are for 4" cross bar centers. Add 1.13 lbs/sq. ft. (3/8" Dia.) or 2.55 lbs/sq. ft. (1" x 1/4") for 2" cross bar centers. Cross bars are determined based on project applications and bearing bar height.

27800.711.4939www.directmetals.comBAR GRATINGHeavy Duty Welded Steel - 19 Space1 x 1/41 x 3/81 - 1/4 x 1/41 - 1/4 x 3/81 - 1/2 x 1/41 - 1/2 x 5/161 - 1/2 x 3/81 - 3/4 x 1/41 - 3/4 x 3/82 x 1/42 x 5/162 x 3/82 - 1/4 x 1/42 - 1/4 x 3/82 - 1/2 x 1/42 - 1/2 x 5/162 - 1/2 x 3/83 x 1/43 x 5/163 x 3/83 x 1/23 - 1/2 x 1/43 - 1/2 x 3/83 - 1/2 x 1/24 x 1/44 x 5/164 x 3/84 x 1/24 - 1/2 x 1/44 - 1/2 x 3/84 - 1/2 x 1/25 x 1/45 x 5/165 x 3/85 x 1/25 - 1/2 x 1/45 - 1/2 x 3/85 - 1/2 x 1/26 x 1/46 x 5/166 x 3/86 x 1/2Bar Size,InchesLoads are theoretical, and are based on a unit stress of 20,000 psi.1'- 0" 1'- 6" 2'- 0" 2'- 6" 3'- 0" 3'- 6" 4'- 0" 4'- 6" 5'- 0" 5'- 6" 6'- 0" 8'- 0"7'- 0"BBSizeThru2 - 1/2"4"cc2"cc72%65%67%61%62%56%74%70%69%65%64%60%54%51%4"cc2"cc3" to 6"CBCtrs1/4" 5/16" 3/8" 1/2"Bearing Bar Thickness% Open Area*Maximum Safe Concentrated Load*, Lbs. - Clear Span28074213438765806313789394738593128931122714033168401421321313175472192726313252603158037893505273438751580421343187128092924438742095262631657298596748493561122794761420911698146181754216840210532526233684229243438745849299423742744911598803789356840140321072193329031573947473742976447561370178420106578773109631315712630157901894725263171932579034387224572807033683449102842042630568403508743860526301123168517552632252531573789343751574491561367365685852570198771105251010412632151572021113755206322750917965224562694735928227363410445472280693508842104561393396550947936140414622193210426313158286442983742467856134738710458497309877184201052712631168421146217193229241497118713224562994018947284203789323391292403508746782283044245656607336844210450524802120412531880180422552707245536843208401048114061609050136265751872179023108271443698251473719650128321604019248256631624024360324802005025063300744009924261363904852028872360904330757743109716451578197323682148322328073508421035535328438754826578631578959473126328597128951719311228140351684222455142102131528420175432193026315350872122831842424552526331578378935052514031754210519102865249531193742315947363899487358475613701884211122876411146215283998112476149701996012631189472526215594194932339131188188702830437738224562807033683449111719257922452807336828434263350943855263505263167579101056877103161375589831122813473179641136817052227361403517544210522806916983254733396420211252633031540420258438753190398747844593574268909187625293781250481661020712248163311033515502206691275915949191382551815439231583087618373229662755936745292436544386421052636316842157318597114627486935711228149709473142101894711696146201754323391141522122828303168422105225262336834912736998256416802096241283181201218016240100251253115037200501213018195242601443618045216532887171051065814210877210965131581754310614159212122812632157891894725263*Based on 10.105 bars / ft. of grating width. Bearing bars 1-1/16" c.c. Note: When serrated grating is specied, the depth of grating required for a specicload will be 1/4" greater than that shown in these tables19-W-4 & 19-W-2 Panel Width Chart (in.) Dimensions Are Out-to-Out of Bearing Bars** No. of Bars 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1/4" Bars 1-7/16 2-5/8 3-13/16 5 6-3/16 7-3/8 8-9/16 9-3/4 10-15/16 12-1/8 13-5/16 14-1/2 15-11/16 16-7/8 18-1/16 5/16" Bars 1-1/2 2-11/16 3-7/8 5-1/16 6-1/4 7-7/16 8-5/8 9-13/16 11 12-3/16 13-3/8 14-9/16 15-3/4 16-15/16 18-1/8 3/8" Bars 1-9/16 2-3/4 3-15/16 5-1/8 6-5/16 7-1/2 8-11/16 9-7/8 11-1/16 12-1/4 13-7/16 14-5/8 15-13/16 17 18-3/16 1/2" Bars 1-11/16 2-7/8 4-1/16 5-1/4 6-7/16 7-5/8 8-13/16 10 11-3/16 12-3/8 13-9/16 14-3/4 15-15/16 17-1/8 18-5/16 No. of Bars 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1/4" Bars 19-1/4 20-7/16 21-5/8 22-13/16 24 25-3/16 26-3/8 27-9/16 28-3/4 29-15/16 31-1/8 32-5/16 33-1/2 34-11/16 35-7/8 5/16" Bars 19-5/16 20-1/2 21-11/16 22-7/8 24-1/16 25-1/4 26-7/16 27-5/8 28-13/16 30 31-3/16 32-3/8 33-9/16 34-3/4 35-15/16 3/8" Bars 19-3/8 20-9/16 21-3/4 22-15/16 24-1/8 25-5/16 26-1/2 27-11/16 28-7/8 30-1/16 31-1/4 32-7/16 33-5/8 34-13/16 36 1/2" Bars 19-1/2 20-11/16 21-7/8 23-1/16 24-1/4 25-7/16 26-5/8 27-13/16 29 30-3/16 31-3/8 32-9/16 33-3/4 34-15/16 36-1/8

28www.directmetals.com800.711.4939BAR GRATINGHeavy Duty Welded Steel 22-W-4/22-W-21 x 1/41 x 3/81 - 1/4 x 1/41 - 1/4 x 3/81 - 1/2 x 1/41 - 1/2 x 5/161 - 1/2 x 3/81 - 3/4 x 1/41 - 3/4 x 3/82 x 1/42 x 5/162 x 3/82 - 1/4 x 1/42 - 1/4 x 3/82 - 1/2 x 1/42 - 1/2 x 5/162 - 1/2 x 3/83 x 1/43 x 5/163 x 3/83 x 1/23 - 1/2 x 1/43 - 1/2 x 3/83 - 1/2 x 1/24 x 1/44 x 5/164 x 3/84 x 1/24 - 1/2 x 1/44 - 1/2 x 3/84 - 1/2 x 1/25 x 1/45 x 5/165 x 3/85 x 1/25 - 1/2 x 1/45 - 1/2 x 3/85 - 1/2 x 1/26 x 1/46 x 5/166 x 3/86 x 1/28.5412.2510.4015.0412.2515.0417.8214.1120.5915.9619.6723.3817.8226.1619.6724.3028.9524.8030.3735.9347.0628.5141.5054.4832.2239.6447.0661.8935.9352.6369.3139.6448.9258.1876.7343.3563.7584.1547.0658.1869.3191.570.3640.5450.5680.8520.8181.0231.2271.1141.6701.4551.8182.1821.8412.7612.2732.8413.4093.2734.0914.9096.5454.4546.6828.9095.8187.2738.72711.6367.36311.04514.7279.09111.36313.63618.18111.00016.49921.99913.09116.36319.63626.1810.1820.2730.3550.5330.6140.7670.9200.9741.4621.4551.8182.1822.0713.1062.8413.5514.2614.9096.1367.3639.8187.79511.69315.59011.63614.54517.45423.27216.56824.85133.13522.72728.40834.09045.45330.24945.37460.49839.27249.08958.90778.5436991312151816232125302638313946455564*74*6081*94*7891*96969696969696969696969696969696677991112111514171917242024282733405236536946576886*588596718896968596969696969679911111213131615172018242024282733385035506645546483*558096678296968096969496969691111131315161520182124212824293332384457*415871*51627387*6389*967692969690969696969696Bar Size,Inches Wt.**Lbs.Sq. FtSx**, in3Ft. Widthlx**, in4Ft. WidthSection Properties Maximum Safe Clear Span, Inches-Partially Distributed Load1 Ton 3 Ton5 Ton H15/H20BBSizeThru2 - 1/2"4"cc2"cc75%68%70%64%66%60%77%72%72%68%68%64%60%56%4"cc2"cc3" to 6"CBCtrs1/4" 5/16" 3/8" 1/2"Bearing Bar Thickness% Open Area**Span limited to 1/400 of span = Deection. ** Based on 8.727 bars/ft of grating width. Bearing bars 1-3/8" c.c. When serrated grating is specied, the depth of grating required for a specic load will be 1/4" greater than that shown in these tables. Weights shown are for 4" cross bar centers. Add 1.13 lbs/sq. ft. (3/8" Dia.) or 2.55 lbs/sq. ft. (1" x 1/4") for 2" cross bar centers. Cross bars aredetermined based on project applications and bearing bar height.

29800.711.4939www.directmetals.comBAR GRATINGHeavy Duty Welded Steel - 22 Space2427363337875680545368208180742711133970012120145471227318407151531894022727218202727332727436332969344547593933878748487581801 x 1/41 x 3/81 - 1/4 x 1/41 - 1/4 x 3/81 - 1/2 x 1/41 - 1/2 x 5/161 - 1/2 x 3/81 - 3/4 x 1/41 - 3/4 x 3/82 x 1/42 x 5/162 x 3/82 - 1/4 x 1/42 - 1/4 x 3/82 - 1/2 x 1/42 - 1/2 x 5/162 - 1/2 x 3/83 x 1/43 x 5/163 x 3/83 x 1/23 - 1/2 x 1/43 - 1/2 x 3/83 - 1/2 x 1/24 x 1/44 x 5/164 x 3/84 x 1/24 - 1/2 x 1/44 - 1/2 x 3/84 - 1/2 x 1/25 x 1/45 x 5/165 x 3/85 x 1/25 - 1/2 x 1/45 - 1/2 x 3/85 - 1/2 x 1/26 x 1/46 x 5/166 x 3/86 x 1/21618242225243787363645475453495174226467808096988182122711010212627151511454718182218182908919796296983959625858323243878751716327244908912131817189328402727341040903713556748506060727361379203757794701136310910136371636321817148472227329697193932424329090387872454336817490903030337877454539711453151522722181272832722971445338804848581949097363606175769091872810909130911745311877178192375715515193952327231029196352945339272242433030136363484832933343997586643490943635523638091211126218931818227327272476371132334040484940916136505163137576727390911090914544989814849197981292916162193932585816362245443272720202252513030240402244443666448887290913636243636581806931038108216231558194923372122318127713463415635075259433054116493623477929350124678484127281697011082138531662322164140252103828051173162164425973346302095231427419032493531168374024986994714201363170520451857278324253030363730684602378847355682545568188182109087423111371484896971212214545193931227218404245451515218938227273030218333274983666521818272723272743635121215161818165024742156269332332727409033674209505048496061727396966599989913199861910775129291723910908163632181813468168342020126935162962444332591193942424129090387871485222719402424290924553681303137884545436454556545872759398909118797757969711636155159817147271963612121151511818124241146672199929332174552181726181349082232334727553444413239674959595079335399809910799705288161057814104892513388178511101913773165282203813333199992666515868198342380131735252631573788363745465454727249497424989964648081969712929818112272163631010112626151512020112222183322444314546181812181829090424263648485554169278311110827012105191402686581082212987173151047615713209511246815584187012493461369204122737576946911363151519167137491833310909136361636321818Bar Size,InchesMaximum Safe Concentrated Load*, Lbs. - Clear SpanLoads are theoretical, and are based on a unit stress of 20,000 psi.1'- 0" 1'- 6" 2'- 0" 2'- 6" 3'- 0" 3'- 6" 4'- 0" 4'- 6" 5'- 0" 5'- 6" 6'- 0" 8'- 0"7'- 0"BBSizeThru2 - 1/2"4"cc2"cc75%68%70%64%66%60%77%72%72%68%68%64%60%56%4"cc2"cc3" to 6"CBCtrs1/4" 5/16" 3/8" 1/2"Bearing Bar Thickness% Open Area** Based on 8.727 bars/ft of grating width. Bearing bars 1-3/8" c.c. Note: When serrated grating is specied, the depth of grating required for a specic load will be 1/4" greater than that shown in these tables.

30www.directmetals.com800.711.4939BAR GRATINGStair TreadsSTANDARD TREAD WIDTHS AND END PLATE DIMENSIONS*Table of widths based on 3/16" thick bearing bars and standard bar spacing 1-3/16" cc (1-1/8" face-to-face for riveted grating.)SUGGESTED BEARING BAR SIZES**Maximum tread length based on 400-lb. concentrated load on nosing and 4 bearing bars at center of tread length. NOTE: Since a serrated connecting bar does not reduce the strength of the grating, R and AR series treads may always be selected from the “Plain” column.NOTE: DIM, B = 2-1/4"for ALL aluminum treads.NOTE: Refer to drawings above for A and B dimensions 5 6-3/16 6-1/4 6-11/16 6-3/8 2-1/2 1-3/4 2-1/4 6 7-3/8 7-7/16 8 7-1/4 4-1/2 1-3/4 2-1/4 7 8-9/16 8-5/8 9-5/16 8-3/4 4-1/2 1-3/4 2-1/4 8 9-3/4 9-13/16 10-5/8 9-15/16 7 1-3/4 2-1/4 9 10-15/16 11 11-15/16 11-1/8 7 1-3/4 2-1/4 10 12-1/8 12-3/16 13-1/4 12-3/8 7 1-3/4 2-1/4 W, SG, SGF SGI R, AR Plank Dimension 1 1-1/2 Series Series Series Series A 1-1/4 1-3/4Dimension BEnd Plate DimensionsAluminum TreadsWidth (includes nosing*) Number of Bearing Bars 1" x 3/16" 2'-4" 2'-2" 1" I-Bar / Plank 2'-6" 3/4" x 3/16" 2'-4" 1'-11" 1-1/4" x 3/16" 2'-10" 2'-7" 1-1/4" I-Bar / Plank 3'-0" 1" x 3/16" 3'-5" 2'-10" 1-1/2" x 3/16" 3'-6" 3'-2" 1-1/2" I-Bar / Plank 3'-6" 1-1/4" x 3/16" 4'-8" 4'-2" 1-3/4" x 3/16" 4'-3" 3'-10" 1-3/4" I-Bar / Plank 4'-5" 1-1/2" x 3/16" 5'-6" 5'-3"Steel TreadsMax. Tread Length*PlainW, RSeriesSGI SeriesPlank SeriesMaximum TreadLength*SGF, SG, ARSeriesSerratedMax. Tread Length*Plain SerratedSTAIR TREAD DETAILS

31800.711.4939www.directmetals.comBAR GRATINGAnchoring DevicesSADDLE CLIPA special bent-clip type fastener for removable bar grating panels is available in aluminum, stainless steel, and galvanized steel. Clips are only supplied by the grating manufacturer. Other fasteningaccessories to be provided byothers. (Note: Cross bars may need to be snipped in the eld to facilitate placement of saddle clips.)ANCHOR BLOCKAnchor blocks of 1/4" or 3/16" thick aluminum. Steel may be shop welded by the gratingmanufacturer and used to fasten permanent or removable grating panels. Anchor blocks arerecessed thus offering a trip-free surface.PLANK CLIPA special friction fastener used in conjunction with plank grating and embedded grating frames. When plank is banded, the clips are installed by the manufacturer.COUNTERSUNK LANDFor close-mesh aluminum grating (7/16" bearing bar centers) a countersunk land may be drilled by the grating manufacturer for use with a 1/4" diameter TEK screw by others.GRATING CLAMPA special friction fastener is available in aluminum, stainless steel, or galvanized steel can be used in conjunction with bar grating and embedded grating frames. (Note: Cross bars may need to be snipped in the eld to facilitate placement of grating clamps.)Z CLIPThe most versatile clip anchor available is the Z Clip. These clips are especially helpful in holding down riveted grating. Z Clips are manufactured from stainless steel and are available in 1" (1" and1-1/4" grating) 1-1/2" (1-1/2" and 1-3/4" grating) and 2" (2", 2-1/4" and 2-1/2" grating) with apre-punched hole to accept a 1/4" bolt or TEK screw by others.PLANK LUGA plank lug inserted and tack welded between anges can serve as an anchor block for plank grating. TEK screw fastener by others.TACK WELDA positive method for anchoring all permanently installed grating.EXAMPLES OF FABRICATIONS

BAR GRATING18www.directmetals.com800.711.4939ALUMINUM RIVETEDA type of aluminum grating, which combines straight bearing bars and bent connectingbars riveted together at their contact points. Riveted grating, although being the oldest style of industrial footwalk, is still the choice of many engineers due to its reliability and durability. All popular sizes and spacings of riveted grating are available. ALUMINUM PLANKA type ofextruded grating, available In 6" wide sections and either plain sided or Interlock-ing. Plank can be provided in sections up to 26'0" in length or fabricated per plans and specs. Plank grating is available un-punched as an economical and structurally superior substitute for aluminum checker-plate or with a variety of punch/patterns. Aluminum ProductsALUMINUM FLUSH TOP A type of pressure locked grating in which the cross bars are in the same plane rela-tive to the top surface of the grating. Bearing bar sizes range from 1" x 1/8" through 2-1/2" x 3/16" in 1/4" increments. Bearing bar spacing of 13/16", 15/16", 11/16" and 7/16" c.c. and cross bar spacing of 4" or 2" are available. Where skid resistance is desired, a serrated surface can be provided. ALUMINUM RECTANGULAR BARA type ofpressure lockedgrating madebypermanentlyattaching cross bars to bearing bars through a pressure applied swagingprocess. Bearing bar sizes range from1" x 1/8" through 2-1/2" x 3/16" in 1/4"increments. Bearing bar spacing of 13/16", 15/16", 11/16" and 7/16" c.c., with cross bar spacing of 4" or 2" are available. Where skid resistance is desired, aserrated surface can be provided. ALUMINUM I-BARA type of pressure locked grating, which utilizes an “I” shaped bearing bar ranging in size from 1" x 1/4" through2-1/2" x1/4" in 1/4" increments. Bearing bar spacing of 13/16" and 15/16" c.c. and cross bar spacings of 4" or 2" are available. The I-Bar design takes advantage of the aluminum extru-sion process by placing the metal where it is most effective, at the outermost ber, while reducing the thickness of the neutral axis web. This design consideration allows the same load carrying capacity at less weight per square foot than rectangular bar, therefore resulting in cost savings.PRESSURE LOCKINGThe most common method of manufactur-ing aluminum bar grating is through a process known as pressure locking.Pressure locked grating as de-ned by the NAAMM Metal Bar Grat-ing Manual is “Grating in which the cross bars aremechanically locked to the bearing bars at their intersections by deforming or swaging the metal.” Direct Metals® provides a permanently attached pressure locked joint, which will give long lasting life under normal service conditions.Aluminum Plank GratingGRATING TYPES AVAILABLE IN ALUMINUMWhere economy is a major consideration, the I-Bar SGI Series offers a popular andreasonably priced alternative to rect-angular bar grating. Extruded I-Bar sections have the same load carrying capacity with less weight per square foot than rectangular bars. The stri-ated top and bottom anges provide a “built-in” skid resistance feature without the added cost of serrating.

19800.711.4939www.directmetals.comBAR GRATINGAluminum 19 Space (1-3/16") Load Table0.329 0.206 1 - 1/4 x 1/8 47 2.081 - 1/4 x 3/163.01 0.4932.34 0.3080.4740.355521 - 1/2 x 1/81 - 1/2 x 3/163.56 0.7111 - 3/4 x 3/162 x 3/162 - 1/4 x 3/162 - 1/2 x 3/165.79 1.9745.24 1.5994.68 1.2630.9674.122.70 0.5334.15 2.4673.75 1.7983.43 1.2630.8463.065359667380872.461.99 0.1581 x 1/8 39 1.710.2110.1051 x 3/16442.46 0.316UDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUD CDUDCD4210.1444210.1156320.1446320.1156580.1156580.0929870.1159870.0929470.0969470.07714210.09614210.07719340.08219340.06625260.07225260.05831970.06431970.05139470.05839470.0462690.2253370.1804040.2555050.1804210.1805260.1446320.1807890.1446060.1507580.1209090.15011370.12012380.12915470.10316170.11320210.09020460.10025580.08025260.09031580.0721870.3242810.2592810.3244210.2592920.2594390.2074390.2596580.2074210.2166320.1736320.2169470.1738600.18512890.14811230.16216840.13014210.14421320.11517540.13026320.104137.4412410.3532060.4413610.3532150.3533760.2823220.3535640.2823090.2945410.2354640.2948120.2356320.25211050.2028250.22114440.17610440.19618270.15712890.17622560.1411580.5763160.4611640.4613290.3692470.4614930.3692370.3844740.3073550.3847110.3074840.3299670.2636320.28812630.2307990.25615990.2059870.23019740.1841950.5834390.4671870.4864210.3892810.4866320.3893820.4178600.3334990.36511230.2926320.32414210.2597800.29217540.2332270.6005680.4803090.5147740.4114040.45010110.3605120.40012790.3206320.36015790.2882560.6227030.4983340.5459190.4364230.48411630.3875220.43614350.3482150.7416450.5922810.6488420.5183550.57610660.4614390.51813160.4152390.7617770.6083030.6769840.5413740.60812150.4872610.7849140.6273220.70611280.5642470.9229870.737Bar Size,InchesPedSpanInchesWt.*Lbs.Sq. Ft.2'- 0" 2'- 6" 3'- 0" 3'- 6" 4'-0" 4'- 6" 5'- 0" 5'- 6" 6'- 0" 6'- 6" 7'- 0" 8'- 0"Sec. PropSx*, in3Ix*, in4U - Safe uniform load in pounds sq. ft.C - Safe concentrated load in pounds/ft. grating widthD - Deflection in inchesLoads and deflections given in this table are theoretical and are based on a unit stress of 12,000 psi.Clear SpanPanel Width Chart (in.) 19-SG-4/19SG-2 Dimensions Are Out-to-Out of Bearing Bars****Bar thickness is 1/4" at top and bottom. Add 1/4" for extended cross bars. Standard panel widths indicated in bold. No. of Bars 2 3 4 5 6 7 8 9 1/4" Flange 1-7/16 2-5/8 3-13/16 5 6-3/16 7-3/8 8-9/16 9-3/4 No. of Bars 10 11 12 13 14 15 16 17 1/4" Flange 10-15/16 12-1/8 13-5/16 14-1/2 15-11/16 16-7/8 18-1/16 19-1/4 No. of Bars 18 19 20 21 22 23 24 25 1/4" Flange 20-7/16 21-5/8 22-13/16 24 25-3/16 26-3/8 27-9/16 28-3/4 No. of Bars 26 27 28 29 30 31 1/4" Flange 29-15/16 31-1/8 32-5/16 33-1/2 34-11/16 35-7/8I-BarI-BarI-BarI-BarI-BarI-BarI-Bar

20www.directmetals.com800.711.4939BAR GRATINGAluminum I-Bar & Rectangular Bar (SGI Series)7-SGI-4 7-SGI-27/16"7-SGI-44"SPAN7/16"7-SGI-2SPAN2"7-SGI-4 7-SGI-2 Panel Width Chart (in.) Dimensions Are Out-to-Out of Bearing Bars** No. of Bars 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1/4" Flange 11/16 1-1/8 1-9/16 2 2-7/16 2-7/8 3-5/16 3-3/4 4-3/16 4-5/8 5-1/16 5-1/2 5-15/16 6-3/8 6-13/16 No. of Bars 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1/4" Flange 7-1/4 7-11/16 8-1/8 8-9/16 9 9-7/16 9-7/8 10-5/16 10-3/4 11-3/16 11-5/8 12-1/16 12-1/2 12-15/16 13-3/8 No. of Bars 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 1/4" Flange 13-13/16 14-1/4 14-11/16 15-1/8 15-9/16 16 16-7/16 16-7/8 17-5/16 17-3/4 18-3/16 18-5/8 19-1/16 19-1/2 19-15/16 No. of Bars 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 1/4" Flange 20-3/8 20-13/16 21-1/4 21-11/16 22-1/8 22-9/16 23 23-7/16 23-7/8 24-5/16 24-3/4 25-3/16 25-5/8 26-1/16 26-1/2 No. of Bars 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 1/4" Flange 26-15/16 27-3/8 27-13/16 28-1/4 28-11/16 29-1/8 29-9/16 30 30-7/16 30-7/8 31-5/16 31-3/4 32-3/16 32-5/8 33-1/16 No. of Bars 77 78 79 80 81 82 83 1/4" Flange 33-1/2 33-15/16 34-3/8 34-13/16 35-1/4 35-11/16 36-1/8 **Bar thickness is 1/4" at top and bottom. Add 1/4" for extended cross bars.*Based on 27.429 bars/ft. of grating width. Bearing bars 7/16" c.c. Add .3 lbs./sq. ft. for 7-SG-2. 1/8" bearing bars available by inquiry. Note: Grating for spans to the left of the heavy line have a deection less than 1/4" for uniform loads of 100 lbs./sq. ft. This is the maximum deection to afford pedestrian comfort and can be exceeded for other types of load at the discretion of the engineer.PedSpan,Inches5666768594103111Wt.*Lbs.Sq. Ft.6.307.789.2810.8012.3213.8315.33Sec. PropSx*, in3Ix*, in40.8570.4291.3390.8371.9291.4462.6252.2973.4293.4294.3394.8825.3576.697UDCDUDCDUDCDUDCDUDCDUDCDUDCDClearSpan2'- 0" 2'- 6" 3'- 0" 3'- 6" 4'- 0" 4'- 6" 5'- 0" 5'- 6" 6'- 0" 6'- 6" 7'- 0" 8'- 0"17140.14417140.11526790.11526790.09238570.09638570.07752500.08252500.06668570.07268570.05886790.06486790.051107140.058107140.04610970.22513710.18017140.18021430.14424690.15030860.12033600.12942000.10343890.11354860.09055540.10069430.08068570.09085720.0727620.32411430.25911900.25917860.20717140.21625710.17323330.18535000.14830480.16245720.13038570.14457860.11547620.13071430.1045600.4419800.3538750.35315310.28212590.29422040.23517140.25230000.20222390.22039180.17628340.19649590.15734990.17661230.1414290.5778570.4616700.46113390.3699640.38419290.30713130.32926250.26317140.28834290.23021700.25643390.20526790.23053570.1843390.7307620.5835290.58311900.4667620.48617140.38910370.41723330.33313550.36530480.29217140.32438570.25921160.29247620.2332740.8996860.7204290.72110710.5766170.60015430.4808400.51421000.41110970.45027430.36013890.40034710.32017140.36042860.2883540.8719740.6975100.72614030.5816940.62219090.4989070.54524940.43611480.48431560.38714170.43638960.3482981.0388930.8304290.86512860.6915830.74017500.5927620.64822860.5189640.57628930.46111900.51835710.4153651.01411870.8114970.86916150.6956490.76021100.6088220.67626700.54110140.60832970.487U - Safe uniform load in pounds/sq. ft.C - Safe concentrated load in pounds/ft. grating widthD - Deection in inchesLoads and deectionsgiven in this table are the-oretical, and are based on a unit stress of 12,000 psi.4291.00915000.8065600.88219590.7067080.78324800.6278750.70630610.5643281.31613131.0544291.15317140.9215421.02321700.8196700.92226790.737Bar Size,Inches1 x 3/161-1/4 x 3/161-1/2 x 3/161-3/4 x 3/162 x 3/162-1/4 x 3/162-1/2 x 3/161" I-Bar1-1/4" I-Bar4.795.751-1/2" I-Bar6.741-3/4" I-Bar7.702" I-Bar8.712-1/4" I-Bar9.592-1/2" I-Bar10.66

21800.711.4939www.directmetals.comAluminum Plank Section AvailabilityAluminum Plank is structurally sound and cosmetically attractive. Plank grating is non-sparking, non-magnetic, non-skid and relatively maintenance free. It is durable, corrosion resistant, and possesses a high strength-to-weight ratio. The surface can be provided unpunched or with a variety of punch/patterns for the passage of air, light, heat, or moisture. The interconnecting webs offer a ush top walking surface. Aluminum plank grating has found use in sewage and waste water treatment plants, as well as in the marine refrigerator (reefer), freezers and cargo-hold ooring market. Aluminum plank grating is available in ve cross-sectional designs: Heavy Duty (plain sides), Heavy Duty (interlocking sides), Light Series (plain sides), Reefer (plain sides) and Reefer (interlocking sides). The Heavy Duty sections are used primarily in water, waste treatment and the marine markets, while the Light Series and Reefer sections are exclusively in the marine refrigerator applications.Interlocking Heavy Duty, Reefer sections and edge sections are available in 1" deep grating only.Plank Punch / Pattern AvailabilityAluminum plank grating is available unpunched or with a variety of punch/patterns as shown below. Rectangular or square punched holes are most commonly used for water and waste treatment plants and in marine applications, while the round holes nd applications primarily in the marine market. The surface of plank grating can be specied as plain or with one of two styles of upsets designed to promote a slip resistant walkway, especially in the presence of moisture, oil or other spilled substances. REEFER (Plain Sides)REEFER PUNCH/PATTERNAVAILABILITYHEAVY DUTY (Plain Sides)3/4"thru2-1/2"1.200"1.200"6"1" only1.500"6"3" FEMALE EDGE 3" MALE EDGE1" only1" only1.500"1.500"1.500"6"HEAVY DUTY (Interlocking Sides)LIGHT SERIES (Plain Sides)1.200"1.200"1.200"2.400"1.200"2-1/2" FEMALE EDGE 2-1/2" MALE EDGE1" only1" only1" only6"6"REEFER (Interlocking Sides)ADA CompliantBAR GRATING

22www.directmetals.com800.711.4939BAR GRATINGTiteWeld® 7-TW-4 Welded SteelIN STOCK!!7-TW-4SPANSPAN7/16"7-TW-44"7/16"7-TW-22"7-TW-4TiteWeld® super narrow welded grating - ideal for those very tight spacing requirements when you need maximum “roll-a-bility.” TiteWeld® satises both ADA comfort requirements for wheel chairs and walking pedestrians. TiteWeld® is IN STOCK and ready to ship.Panel Width Chart (in.) 7-TW-4 TiteWeld® Dimensions Are Out-to-Out of Bearing Bars** No. of Bars 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 3/16" Bars 5/8 1-1/16 1-1/2 1-15/16 2-3/8 2-13/16 3-1/4 3-11/16 4-1/8 4-9/16 5 5-7/16 5-7/8 6-5/16 6-3/4 No. of Bars 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 3/16" Bars 7-3/16 7-5/8 8-1/16 8-1/2 8-15/16 9-3/8 9-13/16 10-1/4 10-11/16 11-1/8 11-9/16 12 12-7/16 12-7/8 13-5/16 No. of Bars 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 3/16" Bars 13-3/4 14-3/16 14-5/8 15-1/16 15-1/2 15-15/16 16-3/8 16-13/16 17-1/4 17-11/16 18-1/8 18-9/16 19 19-7/16 19-7/8 No. of Bars 47 48 49 50 51 52 53 54 55 3/16" Bars 20-5/16 20-3/4 21-3/16 21-5/8 22-1/16 22-1/2 22-15/16 23-3/8 23-13/16**Add 1/4" for extended cross bars. Deduct 1/16" for 1/8" bearing bars. Standard panel widths indicated in bold.*Based on 27.429 bars/ft. of grating width. Bearing bars 7/16" c.c. Add .6 lbs./sq. ft. for 7-TW-2. 1/8" bearing bars available upon inquiry. Note: Grating for spans to the left of the heavy line have a deection less than 1/4" for uniform loads of 100 lbs./sq. ft. This is the maximum deection to afford pedestrian comfort, and can be exceeded for other types of load at the discretion of the engineer. The actual “Ped (pedestrian) Span” under this condi-tion is shown above for each size of grating. When serrated grating is specied, the depth of grating required for a specic load will be 1/4" greater than that shown in these tables. 3/4" x 3/16" serrated grating is NOT available.IN STOCK!!ADA CompliantWt.*Lbs.Sq. Ft.13.7318.0922.4526.8131.2035.5939.9244.31UDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDClearSpan2'- 0" 2'- 6" 3'- 0" 3'- 6" 4'- 0" 4'- 6" 5'- 0" 5'- 6" 6'- 0" 6'- 6" 7'- 0" 8'- 0"1446.0991446.0792571.0742571.0604018.0604018.0485786.0505786.0407875.0437875.03410286.03710286.03013018.03313018.02616072.03016072.030926.1551157.1241646.1162057.0932571.0933214.0743703.0784629.0625040.0676300.0536583.0588229.0478332.05210414.04110286.04712857.037643.223964.1791143.1681714.1341786.1342679.1072571.1123857.0893500.0965250.0774572.0846857.0675786.0748679.0607143.06710714.054472.304827.243840.2281469.1821312.1822296.1461889.1523306.1222571.1304500.1043359.1145878.0914251.1017439.0815248.0919184.073362.398723.318643.2981286.2381004.2382009.1911446.1992893.1591969.1703938.1362571.1495143.1193255.1326509.1064018.1198036.095286.503643.402508.3771143.302794.3021786.2411143.2512571.2011556.2163500.1722032.1894572.1512571.1685786.1343175.1517143.121231.620579.497411.4651029.373643.3721607.298926.3102314.2481260.2663150.2131646.2334114.1862083.2705207.1662571.1866429.149340.563935.451531.4501461.360765.3752104.3001041.3222864.2581360.2823740.2251721.2504734.2002125.2255844.180286.671857.536446.5361339.429643.4471929.358875.3832625.3061143.3353429.2681446.2984339.2381786.2685357.215380.6291236.503548.5251780.420746.4502423.360974.3933165.3151232.3504006.2801522.3154945.252U - Safe uniform load in pounds/sq. ft.C - Safe concentrated load in pounds/ft. grating widthD - Deection in inchesLoads and deectionsgiven in this table aretheoretical, and are based on a unit stress of 18,000 psi.328.7301148.584472.6081653.487643.5212250.417840.4562939.3651063.4063719.3241312.3654592.292251.9531004.762362.7951446.635492.6811969.545643.5962571.477814.5303255.4241004.4764018.381Bar Size,Inches3/4 x 3/161 x 3/161-1/4 x 3/161-1/2 x 3/161-3/4 x 3/162 x 3/162-1/4 x 3/162-1/2 x 3/16

23800.711.4939www.directmetals.comLight Duty Steel Design CriteriaThe tables of safe loads have been computed using the following design parameters:U = Uniform Load - lbs/ft2C = Concentrated Load - lbs/ft of grating widthS = Section Modulus - in3/ft of grating widthI = Moment of Inertia - in4/ft of grating widthL = Simple Clear Span - feetD = Deection - inchesE = Modulus of Elasticity (30,000,000 psi)F = Allowable Bending Stress (18,000 psi)M = Bending MomentLight Duty Welded Steel (W Series)GRATING TYPES - LIGHT DUTY WELDED STEEL W SERIESHOW TO SPECIFY: 1. Grating: Light Duty Welded Steel W Series. 2. Bearing Bars: Rectangular Bar on 1-3/16" centers maximum. (Note: Other spacings may be specied at the discretion of the architect/ engineer.) 3. Cross Bars: Electroforge welded at right angles to bearing bars at 4" centers maximum. (Note: 2" cross bar centers may be specied at the discretion of the architect/engineer.) 4. Surface: Plain. (Note: A serrated surface may be specied for maximum skid resistance.) 5. Loading: Grating to carry a pedestrian loading equal to 100# per square foot over the required clear span with deection not to exceed 1/4". (Note: Alternate loading requirements may be specied at the discretion of the architect/engineer.) 6. Finish: Galvanized or manufacturer’s standard black paint at the discretion of the architect/engineer. 7. Fabrication and Tolerances: In accordance with the NAAMM Metal Bar Grating Manual. For those areas requiring the corrosion resistance of stainless steel, Direct Metals® stocks 1" x 3/16", 1-1/4" x 3/16", and1-1/2" x 3/16" 19-W-4 Type 304 stainless steel electroforge welded grating. Since the welding process discolors the stainless surface, this grating is best suited for industrial applications only and should not be where cosmetic appearance is important. Serrated SurfaceBAR GRATING

24www.directmetals.com800.711.4939BAR GRATINGLight Duty Welded Steel0.316 0.158 1 x 3/16 57 7.040.3290.2060.4930.30861 5.961 - 1/4 x 1/81 - 1/4 x 3/160.4741.5991.9741.2630.9670.7110.3551.7982.4671.2630.8460.5336770 7.041 - 1/2 x 1/877 10.251 - 1/2 x 3/1687 11.871 - 3/4 x 3/1696 13.482 x 3/1610511315.0816.702 - 1/4 x 3/162 - 1/2 x 3/168.640.1053/4 x 3/16 46 5.430.1780.06751 4.881 x 1/80.211UDCDUDCDUDCDUDCDUDCDUDCDUDCDUDCDUD CDUDCDUDCD5330.0995330.0796320.0756320.0609470.0749470.0609870.0609870.04814800.06014800.04814210.05014210.04021320.05021320.04029010.04329010.03437890.03737890.03047960.03347960.02659210.03059210.0243410.1554260.1244040.1165050.0936060.1167580.0936320.0937890.0749470.09311840.0749090.07811370.06213640.07817050.06218570.06723210.05324250.05830320.04730690.05238370.04137890.04747370.0372370.2243550.1792810.1684210.1344210.1686320.1344390.1346580.1076580.1349870.1076320.1129470.0899470.11214210.08912890.09619340.07716840.08425260.06721320.07431970.06026320.06739470.0541740.3043050.2442060.2283610.1833090.2285410.1823220.1825640.1464830.1828460.1464640.1528120.1226960.15212180.1229470.13016580.10412370.11421650.09115660.10127410.08119330.09133830.0731330.3972660.3171580.2983160.2392370.2984740.2392470.2394930.1913700.2387400.1913550.1987110.1595330.19910660.1597250.17014510.1369470.14918950.11911990.13223980.10614800.11929600.0951250.3782810.3021870.3774210.302 1950.3024390.2422920.3016580.2412810.2526320.2014210.2519470.2015730.21512890.1727490.18916840.1519470.16821320.13411700.15126320.1211520.4673790.3721580.3733950.2982370.3735920.2982270.3105680.2483410.3108530.2484640.26611600.2136060.23315160.1867670.20719180.1659470.18623680.1491300.4493590.3611960.4515380.3601880.3765170.3002820.3767750.3013840.32210550.2575010.28213780.2256340.25017440.2007830.22521530.1801640.5354930.4291580.4474740.3582370.4477110.3583220.3839670.3064210.33512630.2685330.29815990.2386580.26819740.2152020.5256560.4202750.4508930.3603590.39411660.3154540.35014760.2805610.31518220.2522370.5228290.4173090.45610830.3653920.40613700.3244830.36516920.2921810.6807250.5452370.5969470.4773000.53011990.4243700.47714800.381Bar Size,InchesPedSpanInchesWt.*Lbs.Sq. Ft.2'- 0" 2'- 6" 3'- 0" 3'- 6" 4'- 0" 4'- 6" 5'- 0" 5'- 6" 6'- 0" 6'- 6" 7'- 0" 8'- 0"Sec. PropSx*, in3Ix*, in4U - Safe uniform load in pounds sq. ft.C - Safe concentrated load in pounds/ft. grating widthD - Deflection in inchesLoads and deflections given in this table are theoretical, and based on a unit stress of 18,000 psi.Clear Span*Based on 10.105 bars/ft. of grating width. Bearing bars 1-3/16" c.c. Add .6 lbs./sq. ft. for 19-SGCS-2. Note: Grating for spans to the left of the heavy line have a deection less than 1/4" for uniform loads of 100 lbs./sq. ft. This is the maximum deection to afford pedestrian comfort, and can be exceeded for other types of load at the discretion of the engineer. The actual “Ped (pedestrian) Span” under this condition is shown above for each size of grating. When serrated grating is specied, the depth of grating required for a specic load will be 1/4" greater than that shown in these tables. 3/4" x 3/16" serrated grating is NOT available.

25800.711.4939www.directmetals.comHeavy Duty Welded Steel (W Series)SLIP-NOT Grip Grate Safety Surface AvailablePlain Surface Serrated SurfaceHeavy Duty Welded Grating ranges in size from 1-1/4" X 1/4" bearing bars through6" x 1/2" (7" bearing bars available byinquiry). Standard bearing bar spacings are 15/16", 13/16",1-3/8", 1-7/8", and 2-3/8"center-to-center. See pages 25 and 27 for standard cross bar design. Rectangular cross bars are also available. Standard cross bar spacings are 4" or 2"center-to-center. HOW TO SPECIFY: 1. Grating: Heavy Duty Welded Steel W Series by Direct Metals® or approved equal. 2. Bearing Bars: To be (size) rectangular bar spaced (as specied) inches center-to-center. (Note: Bearing bar size selection and spacing must be coordinated with the load and span conditions.) 3. Cross Bars: To be (size) spaced 4" center-to-center and welded at right angles to bearing bars with one llet at each bearing bar/cross bar intersection. (Note: 2" cross bar spacing may be specied for maximum lateral stability.) 4. Surface: Plain. (Note: A serrated surface may be specied for maximum skid resistance.) 5. Loading: Shall be specied by the architect/engineer in terms of uniform load/sq. ft., concentrated load/ft. of grating width or by wheel load designation. Loading, bearing bar size, bearing bar spacing and span conditions must be coordinated. 6. Finish: Galvanized or manufacturer’s standard black paint at the discretion of the architect/engineer. 7. Fabrication and Tolerances: In accordance with the NAAMM Heavy Duty Metal Bar Grating Manual.GRATING TYPESHEAVY DUTY WELDED STEEL W SERIESFor trafc areas running perpendicular to the span direction, supplementary bottom cross bars may be specied to provide added lateral stability and impact resistance.BAR GRATING