7W4 7P4 7W2 7P2
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 | 5'-0 | 5'-6 | ||||||||||
| 3/4" x 1/8" Non-Serrated Only | 7W4 | 9.3 | 0.32 | U D |
964 0.099 |
617 0.155 |
429 0.223 |
315 0.304 |
241 0.397 |
190 0.503 |
154 0.621 |
||||||
| 7P4 7P2 |
9.8 10.7 |
C D |
964 0.079 |
771 0.124 |
643 0.179 |
551 0.243 |
482 0.318 |
429 0.402 |
386 0.497 |
||||||||
| 3/4" x 3/16" Non-Serrated Only | 7W4 | 13.7 | 0.48 | U D |
1446 0.099 |
926 0.155 |
643 0.223 |
472 0.304 |
362 0.397 |
286 0.503 |
231 0.621 |
191 0.751 |
|||||
| 7P4 7P2 |
14.6 16.1 |
C D |
1446 0.079 |
1157 0.124 |
964 0.179 |
827 0.243 |
723 0.318 |
643 0.402 |
579 0.497 |
526 0.601 |
|||||||
| 6'-0 | 6'-6 | 7'-0 | |||||||||||||||
| 1" x 1/8" | 7W4 | 12.3 | 0.57 | U D |
1714 0.074 |
1097 0.116 |
762 0.168 |
560 0.228 |
429 0.298 |
339 0.377 |
274 0.466 |
227 0.563 |
190 0.670 |
162 0.787 |
|||
| 7P4 7P2 |
12.7 13.7 |
C D |
1714 0.060 |
1371 0.093 |
1143 0.134 |
980 0.182 |
857 0.238 |
762 0.302 |
686 0.372 |
623 0.451 |
571 0.536 |
527 0.629 |
|||||
| 1" x 3/16" | 7W4 | 18.1 | 0.86 | U D |
2571 0.074 |
1646 0.116 |
1143 0.168 |
840 0.228 |
643 0.298 |
508 0.377 |
411 0.466 |
340 0.563 |
286 0.670 |
243 0.787 |
210 0.912 |
||
| 7P4 7P2 |
19.0 20.5 |
C D |
2571 0.060 |
2057 0.093 |
1714 0.134 |
1469 0.182 |
1286 0.238 |
1143 0.302 |
1029 0.372 |
935 0.451 |
857 0.536 |
791 0.629 |
735 0.730 |
||||
| 8'-0 | 9'-0 | ||||||||||||||||
| 1-1/4" x 1/8" | 7W4 | 15.3 | 0.89 | U D |
2679 0.060 |
1714 0.093 |
1190 0.134 |
875 0.182 |
670 0.238 |
529 0.302 |
429 0.372 |
354 0.451 |
298 0.536 |
254 0.629 |
219 0.730 |
167 0.953 |
|
| 7P4 7P2 |
16.0 17.3 |
C D |
2679 0.048 |
2143 0.074 |
1786 0.107 |
1531 0.146 |
1339 0.191 |
1190 0.241 |
1071 0.298 |
974 0.360 |
893 0.429 |
824 0.504 |
765 0.584 |
670 0.763 |
|||
| 1-1/4" x 3/16" | 7W4 | 22.5 | 1.34 | U D |
4018 0.060 |
2571 0.093 |
1786 0.134 |
1312 0.182 |
1004 0.238 |
794 0.302 |
643 0.372 |
531 0.451 |
446 0.536 |
380 0.629 |
328 0.730 |
251 0.953 |
198 1.207 |
| 7P4 7P2 |
23.9 25.8 |
C D |
4018 0.048 |
3214 0.074 |
2679 0.107 |
2296 0.146 |
2009 0.191 |
1786 0.241 |
1607 0.298 |
1461 0.360 |
1339 0.429 |
1236 0.504 |
1148 0.584 |
1004 0.763 |
893 0.965 |
||
| 1-1/2" x 1/8" | 7W4 | 18.1 | 1.29 | U D |
3857 0.050 |
2469 0.078 |
1714 0.112 |
1259 0.152 |
964 0.199 |
762 0.251 |
617 0.310 |
510 0.376 |
429 0.447 |
365 0.524 |
315 0.608 |
241 0.794 |
190 1.006 |
| 7P4 7P2 |
18.9 20.2 |
C D |
3857 0.040 |
3086 0.062 |
2571 0.089 |
2204 0.122 |
1929 0.159 |
1714 0.201 |
1543 0.248 |
1403 0.300 |
1286 0.358 |
1187 0.420 |
1102 0.487 |
964 0.636 |
857 0.804 |
||
| 1-1/2" x 3/16" | 7W4 | 26.9 | 1.93 | U D |
5786 0.050 |
3703 0.078 |
2571 0.112 |
1889 0.152 |
1446 0.199 |
1143 0.251 |
926 0.310 |
765 0.376 |
643 0.447 |
548 0.524 |
472 0.608 |
362 0.794 |
286 1.006 |
| 7P4 7P2 |
28.3 30.2 |
C D |
5786 0.040 |
4629 0.062 |
3857 0.089 |
3306 0.122 |
2893 0.159 |
2571 0.201 |
2314 0.248 |
2104 0.300 |
1929 0.358 |
1780 0.420 |
1653 0.487 |
1446 0.636 |
1286 0.804 |
||
| 1-3/4" x 3/16" | 2.63 | U D |
7875 0.043 |
5040 0.067 |
3500 0.096 |
2571 0.130 |
1969 0.170 |
1556 0.215 |
1260 0.266 |
1041 0.322 |
875 0.383 |
746 0.450 |
643 0.521 |
492 0.681 |
389 0.862 |
||
| 7P4 7P2 |
32.7 34.6 |
C D |
7875 0.034 |
6300 0.053 |
5250 0.077 |
4500 0.104 |
3938 0.136 |
3500 0.172 |
3150 0.213 |
2864 0.257 |
2625 0.306 |
2423 0.360 |
2250 0.417 |
1969 0.545 |
1750 0.689 |
||
| 2" x 3/16" | 3.43 | U D |
10286 0.037 |
6583 0.058 |
4571 0.084 |
3359 0.114 |
2571 0.149 |
2032 0.189 |
1646 0.233 |
1360 0.282 |
1143 0.335 |
974 0.393 |
840 0.456 |
643 0.596 |
508 0.754 |
||
| 7P4 7P2 |
37.1 39.0 |
C D |
10286 0.030 |
8229 0.047 |
6857 0.067 |
5878 0.091 |
5143 0.119 |
4571 0.151 |
4114 0.186 |
3740 0.225 |
3429 0.268 |
3165 0.315 |
2939 0.365 |
2571 0.477 |
2286 0.603 |
||
| 2-1/4" x 3/16" | 4.34 | U D |
13018 0.033 |
8331 0.052 |
5786 0.074 |
4251 0.101 |
3254 0.132 |
2571 0.168 |
2083 0.207 |
1721 0.250 |
1446 0.298 |
1232 0.350 |
1063 0.406 |
814 0.530 |
643 0.670 |
||
| 7P4 7P2 |
41.5 43.4 |
C D |
13018 0.026 |
10414 0.041 |
8679 0.060 |
7439 0.081 |
6509 0.106 |
5786 0.134 |
5207 0.166 |
4734 0.200 |
4339 0.238 |
4005 0.280 |
3719 0.324 |
3254 0.424 |
2893 0.536 |
||
| 2-1/2" x 3/16" | 5.36 | U D |
16071 0.030 |
10286 0.047 |
7143 0.067 |
5248 0.091 |
4018 0.119 |
3175 0.151 |
2571 0.186 |
2125 0.225 |
1786 0.268 |
1522 0.315 |
1312 0.365 |
1004 0.477 |
794 0.603 |
||
| 7P4 7P2 |
45.9 47.8 |
C D |
16071 0.024 |
12857 0.037 |
10714 0.054 |
9184 0.073 |
8036 0.095 |
7143 0.121 |
6429 0.149 |
5844 0.180 |
5357 0.215 |
4945 0.252 |
4592 0.292 |
4018 0.381 |
3571 0.483 |
||
| 7W4 & 7P4 STANDARD PANEL WIDTH (inches) | ||||||||||||||||||
Panel widths do not include these extensions. |
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| No. of Bars | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | |||
| 1/8" Bar | 9/16" | 1" | 1-7/16" | 1-7/8" | 2-5/16" | 2-3/4" | 3-3/16" | 3-5/8" | 4-1/16" | 4-1/2" | 4-15/16" | 5-3/8" | 5-13/16" | 6-1/4" | 6-11/16" | |||
| 3/16" Bar | 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 | |||
| 1/8" Bar | 7-1/8" | 7-9/16" | 8" | 8-7/16" | 8-7/8" | 9-5/16" | 9-3/4" | 10-3/16" | 10-5/8" | 11-1/16" | 11-1/2" | 11-5/16" | 12-3/8" | 12-13/16" | 13-1/4" | |||
| 3/16" Bar | 7-3/16" | 7-5/8" | 8-1/16" | 8-1/2" | 8-15/16" | 9-3/8" | 9-13/16" | 9-1/4" | 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 | |||
| 1/8" Bar | 13-11/16" | 14-1/8" | 14-9/16" | 15" | 15-7/16" | 15-7/8" | 16-5/16" | 16-3/4" | 17-3/16" | 17-5/8" | 18-1/16" | 18-1/2" | 18-15/16" | 19-3/8" | 19-13/16" | |||
| 3/16" Bar | 13-3/4" | 14-3/16" | 14-5/8" | 15-1/16" | 15-1/2" | 15-15/16" | 16-3/8" | 16-3/16" | 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 | 56 | 57 | 58 | 59 | 60 | 61 | |||
| 1/8" Bar | 20-1/4" | 20-11/16" | 21-1/8" | 21-9/16" | 22" | 22-7/16" | 22-7/8" | 23-5/16" | 23-3/4" | 24-3/16" | 24-5/8" | 25-1/16" | 25-1/2" | 25-15/16" | 26-1/8" | |||
| 3/16" Bar | 20-5/16" | 20-3/4" | 21-13/16" | 21-5/8" | 22-1/16" | 22-1/2" | 22-15/16" | 23-3/8" | 23-13/16" | 24-1/4" | 24-11/16" | 25-1/8" | 25-9/16" | 26" | 26-7/16" | |||
| No. of Bars | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | |||
| 1/8" Bar | 26-13/16" | 27-1/4" | 27-11/16" | 28-1/8" | 28-9/16" | 29" | 29-7/16" | 29-7/8" | 30-5/16" | 30-3/4" | 31-3/16" | 31-5/8" | 32-1/16" | 32-1/2" | 32-15/16" | |||
| 3/16" Bar | 26-7/8" | 27-5/16" | 27-3/4" | 28-3/16" | 28-5/8" | 29-1/16" | 29-1/2" | 29-15/16" | 30-3/8" | 30-13/16" | 31-1/4" | 31-11/16" | 32-1/8" | 32-9/16" | 33" | |||
| No. of Bars | 77 | 78 | 79 | 80 | 81 | 82 | 83 | |||||||||||
| 1/8" Bar | 33-3/8" | 33-13/16" | 34-1/4" | 34-11/16" | 35-1/8" | 35-9/16" | 36" | |||||||||||
| 3/16" Bar | 33-7/16" | 33-7/8" | 34-5/16" | 34-3/4" | 35-3/16" | 35-5/8" | 36-1/16" | |||||||||||