U = safe uniform load (psf)
C = safe concentrated load (psf)
D = deflection in inches
E = modulus of elasticity, 29,000,000 (psi)
F = fiber stress, 18,000 (psi)
Material: ASTM-A-1011 standard
Deflection: Spans and loads to the right of the bold line exceed 1/4″ deflection for uniform load of 100 psf which provides safe pedestrian comport. These can be exceeded for other types of loads with engineer’s approval.
Serrated Bars: For serrated grating, the depth of grating required for a specified load is 1/4″ deeper than that shown in the table.

LOAD & DEFLECTION TABLE: | |||||||||||||||||
Bar Size | Symbol | # per sf | Sec. Mod per ft. of width | ||||||||||||||
2′-0 | 2′-6 | 3′-0 | 3′-6 | 4′-0 | 4′-6 | ||||||||||||
3/4″ x 1/8″ Non-Serrated Only | 19W4 | 3.9 | 0.12 | U D | 355 0.099 | 227 0.155 | 158 0.223 | 116 0.304 | 89 0.397 | 70 0.503 | |||||||
19P4 19P2 | 4.3 5.2 | C D | 355 0.079 | 284 0.124 | 237 0.179 | 203 0.243 | 178 0.318 | 158 0.402 | |||||||||
3/4″ x 3/16″ Non-Serrated Only | 19W4 | 5.6 | 0.18 | U D | 533 0.099 | 341 0.155 | 237 0.223 | 174 0.304 | 133 0.397 | 105 0.503 | |||||||
19P4 19P2 | 6.4 7.8 | C D | 533 0.079 | 426 0.124 | 355 0.179 | 305 0.243 | 266 0.318 | 237 0.402 | |||||||||
5′-0 | 5′-6 | ||||||||||||||||
1″ x 1/8″ | 19W4 19W2 | 5.0 5.5 | 0.21 | U D | 632 0.074 | 404 0.116 | 281 0.168 | 206 0.228 | 158 0.298 | 125 0.377 | 101 0.466 | 84 0.563 | |||||
19P4 19P2 | 5.4 6.3 | C D | 632 0.060 | 505 0.093 | 421 0.134 | 361 0.182 | 316 0.238 | 281 0.302 | 253 0.372 | 230 0.451 | |||||||
1″ x 3/16″ | 19W4 19W2 | 7.2 7.8 | 0.32 | U D | 947 0.074 | 606 0.116 | 421 0.168 | 309 0.228 | 237 0.298 | 187 0.377 | 152 0.466 | 125 0.563 | |||||
19P4 19P2 | 8.1 9.5 | C D | 947 0.060 | 758 0.093 | 632 0.134 | 541 0.182 | 474 0.238 | 421 0.302 | 379 0.372 | 344 0.451 | |||||||
6′-0 | 6′-6 | 7′-0 | |||||||||||||||
1-1/4″ x 1/8″ | 19W4 19W2 | 6.1 6.6 | 0.33 | U D | 987 0.060 | 632 0.093 | 439 0.134 | 322 0.182 | 247 0.238 | 195 0.302 | 158 0.372 | 130 0.451 | 110 0.536 | 93 0.629 | 81 0.730 | ||
19P4 19P2 | 6.8 8.1 | C D | 987 0.048 | 789 0.074 | 658 0.107 | 564 0.146 | 493 0.191 | 439 0.241 | 395 0.298 | 359 0.360 | 329 0.429 | 304 0.504 | 282 0.584 | ||||
1-1/4″ x 3/16″ | 19W4 19W2 | 8.9 9.5 | 0.49 | U D | 1480 0.060 | 947 0.093 | 658 0.134 | 483 0.182 | 370 0.238 | 292 0.302 | 237 0.372 | 196 0.451 | 164 0.536 | 140 0.629 | 121 0.730 | ||
19P4 19P2 | 10.2 12.1 | C D | 1480 0.048 | 1184 0.074 | 987 0.107 | 846 0.146 | 740 0.191 | 658 0.241 | 592 0.298 | 538 0.360 | 493 0.429 | 455 0.504 | 423 0.584 | ||||
8′-0 | 9′-0 | ||||||||||||||||
1-1/2″ x 1/8″ | 19W4 19W2 | 7.2 7.7 | 0.47 | U D | 1421 0.050 | 909 0.078 | 632 0.112 | 464 0.152 | 355 0.199 | 281 0.251 | 227 0.310 | 188 0.376 | 158 0.447 | 135 0.524 | 116 0.608 | 89 0.794 | 70 1.006 |
19P4 19P2 | 7.9 9.2 | C D | 1421 0.040 | 1137 0.062 | 947 0.089 | 812 0.122 | 711 0.159 | 632 0.201 | 568 0.248 | 517 0.300 | 474 0.358 | 437 0.420 | 406 0.487 | 554 0.636 | 316 0.804 | ||
1-1/2″ x 3/16″ | 19W4 19W2 | 10.5 11.2 | 0.71 | U D | 2132 0.050 | 1364 0.078 | 947 0.112 | 696 0.152 | 533 0.199 | 421 0.251 | 341 0.310 | 282 0.376 | 237 0.447 | 202 0.524 | 174 0.608 | 133 0.794 | 105 1.006 |
19P4 19P2 | 11.8 13.8 | C D | 2132 0.040 | 1705 0.062 | 1421 0.089 | 1218 0.122 | 1066 0.159 | 947 0.201 | 853 0.248 | 775 0.300 | 711 0.358 | 656 0.420 | 609 0.487 | 533 0.636 | 474 0.804 | ||
1-3/4″ x 3/16″ | 19W4 19W2 | 12.2 12.8 | 0.97 | U D | 2901 0.043 | 1857 0.067 | 1289 0.096 | 947 0.130 | 725 0.170 | 573 0.215 | 464 0.266 | 384 0.322 | 322 0.383 | 275 0.450 | 237 0.521 | 181 0.681 | 143 0.862 |
19P4 19P2 | 13.5 15.4 | C D | 1901 0.034 | 2321 0.053 | 1934 0.077 | 1658 0.104 | 1451 0.136 | 1289 0.172 | 1161 0.213 | 1055 0.257 | 967 0.306 | 893 0.360 | 829 0.417 | 725 0.545 | 645 0.689 | ||
2″ x 3/16″ | 19W4 19W2 | 13.9 14.5 | 1.26 | U D | 3789 0.037 | 2425 0.058 | 1684 0.084 | 1237 0.114 | 947 0.149 | 749 0.189 | 606 0.233 | 501 0.282 | 421 0.335 | 359 0.393 | 309 0.456 | 237 0.596 | 187 0.754 |
19P4 19P2 | 15.2 17.1 | C D | 3789 0.030 | 3032 0.047 | 2526 0.067 | 2165 0.091 | 1895 0.119 | 1684 0.151 | 1516 0.186 | 1378 0.225 | 1263 0.268 | 1166 0.315 | 1083 0.365 | 947 0.477 | 842 0.603 | ||
2-1/4″ x 3/16″ | 19W4 19W2 | 15.5 16.1 | 1.6 | U D | 4796 0.033 | 3069 0.052 | 2132 0.074 | 1566 0.101 | 1199 0.132 | 947 0.168 | 767 0.207 | 634 0.250 | 533 0.298 | 454 0.350 | 392 0.406 | 300 0.530 | 237 0.670 |
19P4 19P2 | 16.8 18.7 | C D | 4796 0.026 | 3837 0.041 | 3197 0.060 | 2741 0.081 | 2398 0.106 | 2132 0.134 | 1918 0.166 | 1744 0.200 | 1599 0.238 | 1476 0.280 | 1370 0.324 | 1199 0.424 | 1066 0.536 | ||
2-1/2″ x 3/16″ | 19W4 19W2 | 17.2 17.8 | 1.97 | U D | 5921 0.030 | 3789 0.047 | 2632 0.067 | 1933 0.091 | 1480 0.119 | 1170 0.151 | 947 0.186 | 783 0.225 | 658 0.268 | 561 0.315 | 483 0.365 | 370 0.477 | 1292 0.603 |
19P4 19P2 | 18.5 20.4 | C D | 5921 0.024 | 4737 0.037 | 3947 0.054 | 3383 0.073 | 2961 0.095 | 2632 0.121 | 2368 0.149 | 2153 0.180 | 1974 0.215 | 1822 0.252 | 1692 0.292 | 1480 0.381 | 1316 0.483 |

19W4 & 19P4 STANDARD PANEL WIDTH (inches) | |||||||||||||||
Panel widths do not include these extensions. | |||||||||||||||
No. of Bars | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
1/8″ Bar | 1-5/16″ | 2-1/2″ | 3-11/16″ | 4-7/8″ | 6-1/16″ | 7-1/4″ | 8-7/16″ | 9-5/8″ | 10-13/16″ | 12″ | 13-3/16″ | 14-3/8″ | 15-9/16″ | 16-3/4″ | 17-15/16″ |
3/16″ Bar | 1-3/8″ | 2-9/16″ | 3-3/4″ | 4-15/16″ | 6-1/8″ | 7-5/16″ | 8-1/2″ | 9-11/16″ | 10-7/8″ | 12-1/16″ | 13-1/4″ | 14-7/16″ | 15-5/8″ | 16-13/16″ | 18″ |
No. of Bars | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
1/8″ Bar | 19-1/8″ | 20-5/16″ | 21-1/2″ | 22-11/16″ | 23-7/8″ | 25-1/16″ | 26-1/4″ | 27-7/16″ | 28-5/8″ | 29-13/16″ | 31″ | 32-3/16″ | 33-3/8″ | 34-9/16″ | 35-3/4″ |
3/16″ Bar | 19-3/16″ | 20-3/8″ | 21-9/16″ | 22-3/4″ | 23-15/16″ | 25-1/8″ | 26-5/16″ | 27-1/2″ | 28-11/16″ | 29-7/8″ | 31-1/16″ | 32-1/4″ | 33-7/16″ | 34-5/8″ | 35-13/16″ |