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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 = Deection - 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 specied 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 specied at the discretion of the architect/engineer.) 4. Surface: Plain. (Note: A serrated surface may be specied for maximum skid resistance.) 5. Loading: Grating to carry a pedestrian loading equal to 100# per square foot over the required clear span with deection not to exceed 1/4". (Note: Alternate loading requirements may be specied 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 deection less than 1/4" for uniform loads of 100 lbs./sq. ft. This is the maximum deection 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 specied, the depth of grating required for a specic load will be 1/4" greater than that shown in these tables. 3/4" x 3/16" serrated grating is NOT available.