EnZar®

Aluminum Grating Spacing & Load Tables Help You Know Gratings Better

Aluminum Grating Spacing Table
Part No. Spacing Open Area* Description
19-SG-4
19-SGI-4
19-SGF-4
19-ADT-4
The picture shows the bearing bar spacing and cross bar spacing of aluminum grating 19-SG-4. 78% Bearing bars spaced at 1-3/16" on center and cross bars at 4" on center;
The workhorse of industrial flooring popular for platforms, catwalks, mezzanines and stairways.
19-SG-2
19-SGI-2
19-SGF-2
19-ADT-2
The picture shows the bearing bar spacing and cross bar spacing of aluminum grating 19-SG-2. 73% Bearing bars spaced at 1-3/16" on center and cross bars at 4" on center;
Excellent for short spans and applications where additional lateral stability is desired.
15-SG-4
15-SGI-4
15-SGF-4
15-ADT-4
The picture shows the bearing bar spacing and cross bar spacing of aluminum grating 15-SG-4. 75% Bearing bars spaced at 15/16" on center and cross bars at 4" on center;
More than 26% stronger than similar "19" spaced gratings and provides additional flooring surface.
15-SG-2
15-SGI-2
15-SGF-2
15-ADT-2
The picture shows the bearing bar spacing and cross bar spacing of aluminum grating 15-SG-2. 69% Bearing bars spaced at 15/16" on center and close spaced cross bars at 2" on center;
Provides the advantage of closer spaced bearing bars and cross bars.
11-SG-4
11-SGI-4
11-SGF-4
11-ADT-4
The picture shows the bearing bar spacing and cross bar spacing of aluminum grating 11-SG-4. 68% With bearing bars spaced at 11/16" on center, 11-4 and 11-2 gratings with 3/16" thick bearing bars comply with the spacing requirements of the Americans with Disabilities Act. For ADA installations, specify that the bearing bars span perpendicular to the normal flow of traffic.
11-SG-2
11-SGI-2
11-SGF-2
11-ADT-2
The picture shows the bearing bar spacing and cross bar spacing of aluminum grating 11-SG-2. 63%
8-SG-4
8-SGI-4
8-SGF-4
8-ADT-4
The picture shows the bearing bar spacing and cross bar spacing of aluminum grating 8-SG-4. 58% The bar spacing on 8-4 and 8-2 gratings comply with ADA spacing requirements. In addition to pedestrian applications, these products are popular for material handling platforms and mezzanines subject to continuous cart and dolly traffic.
8-SG-2
8-SGI-2
8-SGF-2
8-ADT-2
The picture shows the bearing bar spacing and cross bar spacing of aluminum grating 8-SG-2. 54%
7-SG-4
7-SGI-4
7-SGF-4
7-ADT-4
The picture shows the bearing bar spacing and cross bar spacing of aluminum grating 7-SG-4. 53% The bar spacing on 7-4 and 7-2 gratings comply with ADA spacing requirements and are popular for applications in the public way. When specified with 3/16" thick bearing bars, 7-4 and 7-2 gratings have a net 1/4" clear opening between the bearing bars and often reject intrusion by high-heeled shoes.
7-SG-2
7-SGI-2
7-SGF-2
7-ADT-2
The picture shows the bearing bar spacing and cross bar spacing of aluminum grating 7-SG-2. 49%

* Percentage of open area is based upon 3/16" thick bearing bars and 0.275 cross bars. Contact us if exact open area calculation is required for alternative bearing bar thickness or cross bar sizes.

Where, SG stands for swaged rectangular bar grating; SGI stands for swaged I-bar grating; SGF stands for swaged flush top grating; ADT stands for aluminum dovetail pressure locked grating.

7 Space Load Table

Use this table when evaluating spans and loads for the following types of aluminum grating:
7-SG-4, 7-SG-2, 7-SGI-4, 7-SGI-2, 7-SGF-4, 7-SGF-2, 7-ADT-4 and 7-ADT-2

7 Space Load Table
Bearing Bar Size Approx. Weight Psf* Maximum Pedestrian Span** Unsupported Span
2'-0" 2'-6" 3'-0" 3'-6" 4'-0" 4'-6" 5'-0" 5'-6" 6'-0" 6'-6" 7'-0" 8'-0"
3/4" × 3/16" 4.8 3'-9" U 964 617 429 315 241 191 All loads and deflections are theoretical and based upon the gross sections of the bearing bars, using a fiber stress of 12.000 psi.
D .192 .300 .432 .588 .768 .972
3/4" l-Bar 3.8 C 964 771 643 551 482 429
D .154 .240 .346 .470 .614 .778
1" × 1/8" 4.3 4'-2" U 1143 731 508 373 286 226 183 The values are not intended to be absolute since the actual load capacity will be affected by the slight variations in mill and manufacturing tolerances.
D .144 .225 .324 .441 .576 .729 .900
C 1143 914 762 653 571 508 457
D .115 .180 .259 .353 .461 .583 .720
1" × 3/16" 6.3 4'-8" U 1714 1097 762 560 429 339 274 227 Grating for spans to the left of the heavy line have a deflection ≤ 1/4" for uniform loads of 100 psi.
D .144 .225 .324 .441 .576 .729 .900 1.089
1" l-Bar 4.8 C 1714 1371 1143 980 857 762 686 623
D .115 .180 .259 .353 .461 .583 .720 .871
1-1/4" × 1/8" 5.3 4'-11" U 1786 1143 794 583 446 353 286 236 U = Safe Uniform Load in pounds/sq. foot
C = Concentrated Load in pounds/foot of grating width
D = Deflection in inches
D .115 .180 .259 .353 .461 .583 .720 .871
C 1786 1429 1191 1020 893 794 714 649
D .092 .144 .207 .282 .369 .467 .576 .697
1-1/4" × 3/16" 7.9 5'-6" U 2679 1714 1191 875 670 529 429 354 298 254
D .115 .180 .259 .353 .461 .583 .720 .871 1.037 1.217
1-1/4" I-Bar 5.8 C 2679 2143 1786 1531 1339 1191 1071 974 893 824
D .092 .144 .207 .282 .369 .467 .576 .697 .829 .973
1-1/2" × 1/8" 6.3 5'-8" U 2571 1646 1143 840 643 508 411 340 286 243 210 161
D .096 .150 .216 .294 .384 .486 .600 .726 .864 1.014 1.176 1.536
C 2571 2057 1714 1469 1286 1143 1029 935 857 791 735 643
D .077 .120 .173 .235 .307 .389 .480 .581 .691 .811 .941 1.229
1-1/2 × 3/16 9.4 6'-4" U 3857 2469 1714 1260 964 762 617 510 429 365 315 241
D .096 .150 .216 .294 .384 .486 .600 .726 .864 1.014 1.176 1.536
1-1/2" I-Bar 6.8 C 3857 3086 2571 2204 1929 1714 1543 1403 1286 1187 1102 964
D .077 .120 .173 .235 .307 .389 .480 .581 .691 .811 .941 1.229
1-3/4" × 1/8" 7.4 6'-5" U 3500 2240 1556 1143 875 691 560 463 389 331 286 219
D .082 .129 .185 .252 .329 .417 .514 .622 .741 .869 1.008 1.317
C 3500 2800 2333 2000 1750 1556 1400 1273 1167 1077 1000 875
D .066 .103 .148 .202 .263 .333 .411 .498 .592 .695 .806 1.053
1-3/4" × 3/16" 10.9 7'-1" U 5250 3360 2333 1714 1313 1037 840 694 583 497 429 328
D .082 .129 .185 .252 .329 .417 .514 .622 .741 .869 1.008 1.317
1-3/4" I-Bar 7.7 C 5250 4200 3500 3000 2625 2333 2100 1909 1750 1615 1500 1313
D .066 .103 .148 .202 .263 .333 .411 .498 .592 .695 .806 1.053
2" × 1/8" 8.4 7'-1" U 4571 2926 2032 1493 1143 903 731 605 508 433 373 286
D .072 .113 .162 .221 .288 .365 .450 .545 .648 .761 .882 1.152
C 4571 3657 3048 2612 2286 2032 1829 1662 1524 1407 1306 1143
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2" × 3/16" 12.5 7'-10" U 6857 4389 3048 2239 1714 1355 1097 907 762 649 560 429
D .072 .113 .162 .221 .288 .365 .450 .545 .648 .761 .882 1.152
2" I-Bar 8.7 C 6857 5486 4571 3918 3429 3048 2743 2494 2286 2110 1959 1714
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2-1/4" × 3/16" 14.0 8'-7" U 8679 5554 3857 2834 2170 1714 1389 1148 964 822 709 542
D .064 .100 .144 .196 .256 .324 .400 .484 .576 .676 .784 1.024
2-1/4" I-Bar 9.6 C 8679 6943 5786 4959 4339 3857 3471 3156 2893 2670 2480 2170
D .051 .080 .115 .157 .205 .259 .320 .387 .461 .541 .627 .819
2-1/2" × 3/16" 15.5 9'-3" U 10714 6857 4762 3499 2679 2116 1714 1417 1191 1014 875 670
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2-1/2" I-Bar 10.7 C 10714 8571 7143 6122 5357 4762 4286 3896 3571 3297 3061 2679
D .046 .072 .104 .141 .184 .233 .288 .348 .415 .487 .564 .737

*Weight per square foot based upon 7-SG-4 grating. Add 0.30 psf for 2" on center cross bars.

**Maximum pedestrian load is defined as a 100# Uniform Load with deflection ≤ 1/4 inch. The 1/4" maximum deflection criteria is considered consistent with pedestrian comfort, but may be exceeded for other loading conditions at the discretion of the specifying authority.

Note: When gratings with serrated surface are specified, the depth of the grating required for a specific load will be 1/4" greater than that shown in these tables.

Panel Widths

Grating panels are available from stock in nominal 24" and 36" widths. When considering alternative widths, consult this table to select widths that will maintain uniform "out-to-out" spacing of the bearing bars. Specified widths deviating from this table will be fabricated to size with side banding and the bar spacing on one side of the finished panel will deviate from the spacing throughout the remainder of the panel.

Panel Widths
Number of Bearing Bars 2 3 4 5 6 7 8 9 10 11
Panel Width 5/8" 1-1/16" 1-1/2" 1-15/16" 2-3/8" 2-13/16" 3-1/4" 3-1/4" 4-1/8" 4-9/16"
Number of Bearing Bars 12 13 14 15 16 17 18 19 20 21
Panel Width 5" 5-7/16" 5-7/8" 6-5/16" 6-3/4" 7-3/16" 7-5/8" 8-1/16" 8-1/2" 8-15/16"
Number of Bearing Bars 22 23 24 25 26 27 28 29 30 31
Panel Width 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"
Number of Bearing Bars 32 33 34 35 36 37 38 39 40 41
Panel Width 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"
Number of Bearing Bars 42 43 44 45 46 47 48 49 50 51
Panel Width 18-1/8" 18-9/16" 19" 19-7/16" 19-7/8" 20-5/16" 20-3/4" 21-3/16" 21-5/8" 22-1/16"
Number of Bearing Bars 52 53 54 55 56 57 58 59 60 61
Panel Width 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"
Number of Bearing Bars 62 63 64 65 66 67 68 69 70 71
Panel Width 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"
Number of Bearing Bars 72 73 74 75 76 77 78 79 80 81
Panel Width 31-1/4" 31-11/16" 32-1/8" 32-9/16" 33" 33-7/16" 33-7/8" 34-5/16" 34-3/4" 35-3/16"
Number of Bearing Bars 82 83
Panel Width 35-5/8" 36-1/16"

Panel widths indicated are for gratings with 3/16" thick bearing bars. For 1/8" thick bearing bars deduct 1/16" from the stated values. Add 1/4" to all dimensions for extended cross bars on all aluminum products.

8 Space Load Table

Use this table when evaluating spans and loads for the following types of aluminum grating:
8-SG-4, 8-SG-2, 8-SGI-4, 8-SGI-2, 8-SGF-4, 8-SGF-2, 8-ADT-4 and 8-ADT-2.

8 Space Load Table
Bearing Bar Size Approx. Weight Psf* Maximum Pedestrian Span** Unsupported Span
2'-0" 2'-6" 3'-0" 3'-6" 4'-0" 4'-6" 5'-0" 5'-6" 6'-0" 6'-6" 7'-0" 8'-0"
3/4" × 3/16" 4.3 3'-7" U 844 540 375 276 211 167 All loads and deflections are theoretical and based upon the gross sections of the bearing bars, using a fiber stress of 12.000 psi.
D .192 .300 .432 .588 .768 .972
3/4" l-Bar 3.4 C 844 675 563 482 422 375
D .154 .240 .346 .470 .614 .778
1" × 1/8" 3.8 4'-1" U 1000 640 444 327 250 198 160 The values are not intended to be absolute since the actual load capacity will be affected by the slight variations in mill and manufacturing tolerances.
D .144 .225 .324 .441 .576 .729 .900
C 1000 800 667 571 500 444 400
D .115 .180 .259 .353 .461 .583 .720
1" × 3/16" 5.6 4'-6" U 1500 960 667 490 375 296 240 198 Grating for spans to the left of the heavy line have a deflection ≤ 1/4" for uniform loads of 100 psi.
D .144 .225 .324 .441 .576 .729 .900 1.089
1" l-Bar 4.3 C 1500 1200 1000 857 750 667 600 546
D .115 .180 .259 .353 .461 .583 .720 .871
1-1/4" × 1/8" 4.7 4'-10" U 1563 1000 694 510 391 309 250 207 U = Safe Uniform Load in pounds/sq. foot
C = Concentrated Load in pounds/foot of grating width
D = Deflection in inches
D .115 .180 .259 .353 .461 .583 .720 .871
C 1563 1250 1042 893 781 694 625 568
D .092 .144 .207 .282 .369 .467 .576 .697
1-1/4" × 3/16" 7.0 5'-4" U 2344 1500 1042 765 586 463 375 310 260 222
D .115 .180 .259 .353 .461 .583 .720 .871 1.037 1.217
1-1/4" I-Bar 5.2 C 2344 1875 1563 1339 1172 1042 938 852 781 721
D .092 .144 .207 .282 .369 .467 .576 .697 .829 .973
1-1/2" × 1/8" 5.6 5'-6" U 2250 1440 1000 735 563 444 360 298 250 213 184 141
D .096 .150 .216 .294 .384 .486 .600 .726 .864 1.014 1.176 1.536
C 2250 1800 1500 1286 1125 1000 900 818 750 692 643 563
D .077 .120 .173 .235 .307 .389 .480 .581 .691 .811 .941 1.229
1-1/2 × 3/16 8.3 6'-1" U 3375 2160 1500 1102 844 667 540 446 375 320 276 211
D .096 .150 .216 .294 .384 .486 .600 .726 .864 1.014 1.176 1.536
1-1/2" I-Bar 6.0 C 3375 2700 2250 1929 1688 1500 1350 1227 1125 1039 964 844
D .077 .120 .173 .235 .307 .389 .480 .581 .691 .811 .941 1.229
1-3/4" × 1/8" 6.5 6'-2" U 3063 1960 1361 1000 766 605 490 405 340 290 250 191
D .082 .129 .185 .252 .329 .417 .514 .622 .741 .869 1.008 1.317
C 3063 2450 2042 1750 1531 1361 1225 1114 1021 942 875 766
D .066 .103 .148 .202 .263 .333 .411 .498 .592 .695 .806 1.053
1-3/4" × 3/16" 9.6 6'-10" U 4594 2940 2042 1500 1148 907 735 607 510 435 375 287
D .082 .129 .185 .252 .329 .417 .514 .622 .741 .869 1.008 1.317
1-3/4" I-Bar 6.8 C 4594 3675 3063 2625 2297 2042 1838 1671 1531 1414 1313 1148
D .066 .103 .148 .202 .263 .333 .411 .498 .592 .695 .806 1.053
2" × 1/8" 7.4 6'-10" U 4000 2560 1778 1306 1000 790 640 529 444 379 327 250
D .072 .113 .162 .221 .288 .365 .450 .545 .648 .761 .882 1.152
C 4000 3200 2667 2286 2000 1778 1600 1455 1333 1231 1143 1000
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2" × 3/16" 11.0 7'-7" U 6000 3840 2667 1959 1500 1185 960 793 667 568 490 375
D .072 .113 .162 .221 .288 .365 .450 .545 .648 .761 .882 1.152
2" I-Bar 7.7 C 6000 4800 4000 3429 3000 2667 2400 2182 2000 1846 1714 1500
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2-1/4" × 3/16" 12.3 8'-4" U 7594 4860 3375 2480 1898 1500 1215 1004 844 719 620 475
D .064 .100 .144 .196 .256 .324 .400 .484 .576 .676 .784 1.024
2-1/4" I-Bar 8.5 C 7594 6075 5063 4339 3797 3375 3038 2761 2531 2337 2170 1898
D .051 .080 .115 .157 .205 .259 .320 .387 .461 .541 .627 .819
2-1/2" × 3/16" 13.7 9'-0" U 9375 6000 4167 3061 2344 1852 1500 1240 1042 888 765 586
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2-1/2" I-Bar 9.5 C 9375 7500 6250 5357 4688 4167 3750 3409 3125 2885 2679 2344
D .046 .072 .104 .141 .184 .233 .288 .348 .415 .487 .564 .737

*Weight per square foot based upon 8-SG-4 grating. Add 0.30 psf for 2" on center cross bars.

**Maximum pedestrian load is defined as a 100# Uniform Load with deflection ≤ 1/4 inch.

The 1/4" maximum deflection criteria is considered consistent with pedestrian comfort, but may be exceeded for other loading conditions at the discretion of the specifying authority.

Note: When gratings with serrated surface are specified, the depth of the grating required for a specific load will be 1/4" greater than that shown in these tables.

Panel Widths

Grating panels are available from stock in nominal 24" and 36" widths. When considering alternative widths, consult this table to select widths that will maintain uniform "out-to-out" spacing of the bearing bars. Specified widths deviating from this table will be fabricated to size with side banding and the bar spacing on one side of the finished panel will deviate from the spacing throughout the remainder of the panel.

Panel Widths
Number of Bearing Bars 2 3 4 5 6 7 8 9 10 11
Panel Width 11/16" 1-3/16" 1-11/16" 2-3/16" 2-11/16" 3-3/16" 3-11/16" 4-3/16" 4-11/16" 5-3/16"
Number of Bearing Bars 12 13 14 15 16 17 18 19 20 21
Panel Width 5-11/16" 6-3/16" 6-11/16" 7-3/16" 7-11/16" 8-3/16" 8-3/16" 9-3/16" 9-11/16" 10-3/16"
Number of Bearing Bars 22 23 24 25 26 27 28 29 30 31
Panel Width 10-11/16" 11-3/16" 11-11/16" 12-3/16" 12-11/16" 13-3/16" 13-11/16" 14-3/16" 14-11/16" 15-3/16"
Number of Bearing Bars 32 33 34 35 36 37 38 39 40 41
Panel Width 15-11/16" 16-3/16" 16-11/16" 17-3/16" 17-3/16" 18-3/16" 18-11/16" 19-3/16" 19-11/16" 20-3/16"
Number of Bearing Bars 42 43 44 45 46 47 48 49 50 51
Panel Width 20-11/16" 21-3/16" 21-11/16" 22-3/16" 22-11/16" 23-3/16" 23-11/16" 24-3/16" 24-11/16" 25-3/16"
Number of Bearing Bars 52 53 54 55 56 57 58 59 60 61
Panel Width 25-11/16" 26-3/16" 26-11/16" 27-11/16" 27-11/16" 28-3/16" 28-11/16" 29-3/16" 29-11/16" 30-3/16"
Number of Bearing Bars 62 63 64 65 66 67 68 69 70 71
Panel Width 30-11/16" 31-3/16" 31-11/16" 32-3/16" 32-11/16" 34-3/16" 34-3/16" 34-3/16" 34-11/16" 35-3/16"
Number of Bearing Bars 72
Panel Width 35-11/16"

Panel widths indicated are for gratings with 3/16" thick bearing bars. For 1/8" thick bearing bars deduct 1/16" from the stated values. Add 1/4" to all dimensions for extended cross bars on all aluminum products.

11 Space Load Table

Use this table when evaluating spans and loads for the following types of aluminum grating:
11-SG-4, 11-SG-2, 11-SGI-4, 11-SGI-2, 11-SGF-4, 11-SGF-2, 11-ADT-4 and 11-ADT-2.

11 Space Load Table
Bearing Bar Size Approx. Weight Psf* Maximum Pedestrian Span** Unsupported Span
2'-0" 2'-6" 3'-0" 3'-6" 4'-0" 4'-6" 5'-0" 5'-6" 6'-0" 6'-6" 7'-0" 8'-0"
3/4" × 3/16" 3.2 3'-4" U 614 393 273 200 153 All loads and deflections are theoretical and based upon the gross sections of the bearing bars, using a fiber stress of 12.000 psi.
D .192 .300 .432 .588 .768
3/4" l-Bar 2.7 C 614 491 409 351 307
D .154 .240 .346 .470 .614
1" × 1/8" 2.8 3'-9" U 727 466 323 238 182 144 The values are not intended to be absolute since the actual load capacity will be affected by the slight variations in mill and manufacturing tolerances.
D .144 .225 .324 .441 .576 .729
C 727 582 485 416 364 323
D .115 .180 .259 .353 .461 .583
1" × 3/16" 4.1 4'-2" U 1091 698 485 356 273 216 175 Grating for spans to the left of the heavy line have a deflection ≤ 1/4" for uniform loads of 100 psi.
D .144 .225 .324 .441 .576 .729 .900
1" l-Bar 3.2 C 1091 873 727 623 546 485 436
D .115 .180 .259 .353 .461 .583 .720
1-1/4" × 1/8" 3.5 4'-5" U 1136 727 505 371 284 225 182 U = Safe Uniform Load in pounds/sq. foot
C = Concentrated Load in pounds/foot of grating width
D = Deflection in inches
D .115 .180 .259 .353 .461 .583 .720
C 1136 909 758 649 568 505 455
D .092 .144 .207 .282 .369 .467 .576
1-1/4" × 3/16" 5.1 4'-11" U 1705 1091 758 557 426 337 273 225 189
D .115 .180 .259 .353 .461 .583 .720 .871 1.037
1-1/4" I-Bar 3.8 C 1705 1364 1136 974 852 758 682 620 568
D .092 .144 .207 .282 .369 .467 .576 .697 .829
1-1/2" × 1/8" 4.1 5'-1" U 1636 1047 727 534 409 323 262 216 182 155 134 102
D .096 .150 .216 .294 .384 .486 .600 .726 .864 1.014 1.176 1.536
C 1636 1309 1091 935 818 727 655 595 546 504 468 409
D .077 .120 .173 .235 .307 .389 .480 .581 .691 .811 .941 1.229
1-1/2 × 3/16 6.1 5'-8" U 2455 1571 1091 802 614 485 393 325 273 232 200 153
D .096 .150 .216 .294 .384 .486 .600 .726 .864 1.014 1.176 1.536
1-1/2" I-Bar 4.4 C 2455 1964 1636 1403 1227 1091 982 893 818 755 701 614
D .077 .120 .173 .235 .307 .389 .480 .581 .691 .811 .941 1.229
1-3/4" × 1/8" 4.8 5'-9" U 2227 1426 990 727 557 440 356 295 248 211 182 139
D .082 .129 .185 .252 .329 .417 .514 .622 .741 .869 1.008 1.317
C 2227 1782 1485 1273 1114 990 891 810 742 685 636 557
D .066 .103 .148 .202 .263 .333 .411 .498 .592 .695 .806 1.053
1-3/4" × 3/16" 7.1 6'-4" U 3341 2138 1485 1091 835 660 535 442 371 316 273 209
D .082 .129 .185 .252 .329 .417 .514 .622 .741 .869 1.008 1.317
1-3/4" I-Bar 5.1 C 3341 2673 2227 1909 1671 1485 1336 1215 1114 1028 955 835
D .066 .103 .148 .202 .263 .333 .411 .498 .592 .695 .806 1.053
2" × 1/8" 5.4 6'-4" U 2909 1862 1293 950 727 575 466 385 323 275 238 182
D .072 .113 .162 .221 .288 .365 .450 .545 .648 .761 .882 1.152
C 2909 2327 1939 1662 1455 1293 1164 1058 970 895 831 727
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2" × 3/16" 8.0 7'-0" U 4364 2793 1939 1425 1091 862 698 577 485 413 356 273
D .072 .113 .162 .221 .288 .365 .450 .545 .648 .761 .882 1.152
2" I-Bar 5.7 C 4364 3491 2909 2494 2182 1939 1746 1587 1455 1343 1247 1091
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2-1/4" × 3/16" 9.0 7'-8" U 5523 3535 2455 1803 1381 1091 884 730 614 523 451 345
D .064 .100 .144 .196 .256 .324 .400 .484 .576 .676 .784 1.024
2-1/4" I-Bar 6.3 C 5523 4418 3682 3156 2761 2455 2209 2008 1841 1699 1578 1381
D .051 .080 .115 .157 .205 .259 .320 .387 .461 .541 .627 .819
2-1/2" × 3/16" 10.0 8'-4" U 6818 4364 3030 2226 1705 1347 1091 902 758 646 557 426
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2-1/2" I-Bar 6.9 C 6818 5455 4546 3896 3409 3030 2727 2479 2273 2098 1948 1705
D .046 .072 .104 .141 .184 .233 .288 .348 .415 .487 .564 .737

*Weight per square foot based upon 11-SG-4 grating. Add 0.30 psf for 2" on center cross bars.

**Maximum pedestrian load is defined as a 100# Uniform Load with deflection ≤ 1/4 inch.

The 1/4" maximum deflection criteria is considered consistent with pedestrian comfort, but may be exceeded for other loading conditions at the discretion of the specifying authority.

Note: When gratings with serrated surface are specified, the depth of the grating required for a specific load will be 1/4" greater than that shown in these tables.

Panel Widths

Grating panels are available from stock in nominal 24" and 36" widths. When considering alternative widths, consult this table to select widths that will maintain uniform "out-to-out" spacing of the bearing bars. Specified widths deviating from this table will be fabricated to size with side banding and the bar spacing on one side of the finished panel will deviate from the spacing throughout the remainder of the panel.

Panel Widths
Number of Bearing Bars 2 3 4 5 6 7 8 9 10 11
Panel Width 7/8" 1-9/16" 2-1/4" 2-15/16" 3-5/8" 4-5/16" 5" 5-11/16" 6-3/8" 7-1/16"
Number of Bearing Bars 12 13 14 15 16 17 18 19 20 21
Panel Width 7-3/4" 8-7/16" 9-1/8" 9-13/16" 10-1/2" 11-3/16" 11-7/8" 12-9/16" 13-1/4" 13-15/16"
Number of Bearing Bars 22 23 24 25 26 27 28 29 30 31
Panel Width 14-5/8" 15-5/16" 16" 16-11/16" 17-3/8" 18-1/16" 18-3/4" 19-7/16" 20-1/8" 20-13/16"
Number of Bearing Bars 32 33 34 35 36 37 38 39 40 41
Panel Width 21-1/2" 22-3/16" 22-7/8" 23-9/16" 24-1/4" 24-15/16" 25-5/8" 26-5/16" 27" 27-11/16"
Number of Bearing Bars 42 43 44 45 46 47 48 49 50 51
Panel Width 28-3/8" 29-1/16" 29-3/4" 31-1/8" 31-1/8" 32-1/2" 32-1/2" 33-7/8" 33-7/8" 34-9/16"
Number of Bearing Bars 52 53
Panel Width 35-1/4" 35-15/16"

Panel widths indicated are for gratings with 3/16" thick bearing bars. For 1/8" thick bearing bars deduct 1/16" from the stated values. Add 1/4" to all dimensions for extended cross bars on all aluminum products.

15 Space Load Table

Use this table when evaluating spans and loads for the following types of aluminum grating:
15-SG-4, 15-SG-2, 15-SGI-4, 15-SGI-2, 15-SGF-4, 15-SGF-2, 15-ADT-4 and 15-ADT-2.

15 Space Load Table
Bearing Bar Size Approx. Weight Psf* Maximum Pedestrian Span** Unsupported Span
2'-0" 2'-6" 3'-0" 3'-6" 4'-0" 4'-6" 5'-0" 5'-6" 6'-0" 6'-6" 7'-0" 8'-0"
3/4" × 3/16" 2.4 3'-1" U 450 288 200 147 113 All loads and deflections are theoretical and based upon the gross sections of the bearing bars, using a fiber stress of 12.000 psi.
D .192 .300 .432 .588 .768
3/4" l-Bar 2.0 C 450 360 300 257 225
D .154 .240 .346 .470 .614
1" × 1/8" 2.1 3'-6" U 533 341 237 174 133 105 The values are not intended to be absolute since the actual load capacity will be affected by the slight variations in mill and manufacturing tolerances. Grating for spans to the left of the heavy line have a deflection ≤ 1/4" for uniform loads of 100 psi.
D .144 .225 .324 .441 .576 .729
C 533 427 356 305 267 237
D .115 .180 .259 .353 .461 .583
1" × 3/16" 3.1 3'-10" U 800 512 356 261 200 158
D .144 .225 .324 .441 .576 .729
1" l-Bar 2.5 C 800 640 533 457 400 356
D .115 .180 .259 .353 .461 .583
1-1/4" × 1/8" 2.6 4'-1" U 833 533 370 272 208 165 133 U = Safe Uniform Load in pounds/sq. foot
C = Concentrated Load in pounds/foot of grating width
D = Deflection in inches
D .115 .180 .259 .353 .461 .583 .720
C 833 667 556 476 417 370 333
D .092 .144 .207 .282 .369 .467 .576
1-1/4" × 3/16" 3.8 4'-7" U 1250 800 556 408 313 247 200 165 139
D .115 .180 .259 .353 .461 .583 .720 .871 1.037
1-1/4" I-Bar 2.9 C 1250 1000 833 714 625 556 500 455 417
D .092 .144 .207 .282 .369 .467 .576 .697 .829
1-1/2" × 1/8" 3.1 4'-8" U 1200 768 533 392 300 237 192 159 133 114 98 75
D .096 .150 .216 .294 .384 .486 .600 .726 .864 1.014 1.176 1.536
C 1200 960 800 686 600 533 480 436 400 369 343 300
D .077 .120 .173 .235 .307 .389 .480 .581 .691 .811 .941 1.229
1-1/2 × 3/16 4.5 5'-3" U 1800 1152 800 588 450 356 288 238 200 170 147 113
D .096 .150 .216 .294 .384 .486 .600 .726 .864 1.014 1.176 1.536
1-1/2" I-Bar 3.4 C 1800 1440 1200 1029 900 800 720 655 600 554 514 450
D .077 .120 .173 .235 .307 .389 .480 .581 .691 .811 .941 1.229
1-3/4" × 1/8" 3.6 5'-4" U 1633 1045 726 533 408 323 261 216 182 155 133 102
D .082 .129 .185 .252 .329 .417 .514 .622 .741 .869 1.008 1.317
C 1633 1307 1089 933 817 726 653 594 544 503 467 408
D .066 .103 .148 .202 .263 .333 .411 .498 .592 .695 .806 1.053
1-3/4" × 3/16" 5.3 5'-10" U 2450 1568 1089 800 613 484 392 324 272 232 200 153
D .082 .129 .185 .252 .329 .417 .514 .622 .741 .869 1.008 1.317
1-3/4" I-Bar 3.8 C 2450 1960 1633 1400 1225 1089 980 891 817 754 700 613
D .066 .103 .148 .202 .263 .333 .411 .498 .592 .695 .806 1.053
2" × 1/8" 4.1 5'-10" U 2133 1365 948 697 533 421 341 282 237 202 174 133
D .072 .113 .162 .221 .288 .365 .450 .545 .648 .761 .882 1.152
C 2133 1707 1422 1219 1067 948 853 776 711 656 610 533
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2" × 3/16" 6.0 6'-6" U 3200 2048 1422 1045 800 632 512 423 356 303 261 200
D .072 .113 .162 .221 .288 .365 .450 .545 .648 .761 .882 1.152
2" I-Bar 4.3 C 3200 2560 2133 1829 1600 1422 1280 1164 1067 985 914 800
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2-1/4" × 3/16" 6.7 7'-1" U 4050 2592 1800 1322 1013 800 648 536 450 383 331 253
D .064 .100 .144 .196 .256 .324 .400 .484 .576 .676 .784 1.024
2-1/4" I-Bar 4.7 C 4050 3240 2700 2314 2025 1800 1620 1473 1350 1246 1157 1013
D .051 .080 .115 .157 .205 .259 .320 .387 .461 .541 .627 .819
2-1/2" × 3/16" 7.4 7'-8" U 5000 3200 2222 1633 1250 988 800 661 556 473 408 313
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2-1/2" I-Bar 5.2 C 5000 4000 3333 2857 2500 2222 2000 1818 1667 1539 1429 1250
D .046 .072 .104 .141 .184 .233 .288 .348 .415 .487 .564 .737

*Weight per square foot based upon 15-SG-4 grating. Add 0.30 psf for 2" on center cross bars.

**Maximum pedestrian load is defined as a 100# Uniform Load with deflection≤1/4 inch.

**The 1/4" maximum deflection criteria is considered consistent with pedestrian comfort, but may be exceeded for other loading conditions at the discretion of the specifying authority.

Note: When gratings with serrated surface are specified, the depth of the grating required for a specific load will be 1/4" greater than that shown in these tables.

Panel Widths

Grating panels are available from stock in nominal 24" and 36" widths. When considering alternative widths, consult this table to select widths that will maintain uniform "out-to-out" spacing of the bearing bars. Specified widths deviating from this table will be fabricated to size with side banding and the bar spacing on one side of the finished panel will deviate from the spacing throughout the remainder of the panel.

Panel Widths
Number of Bearing Bars 2 3 4 5 6 7 8 9 10 11
Panel Width 1-1/8" 2-1/16" 3" 3-15/16" 4-7/8" 5-13/16" 6-3/4" 7-11/16" 8-5/8" 9-9/16"
Number of Bearing Bars 12 13 14 15 16 17 18 19 20 21
Panel Width 10-1/2" 11-7/16" 12-3/8" 13-5/16" 14-1/4" 15-3/16" 16-1/8" 17-1/16" 18" 18-15/16"
Number of Bearing Bars 22 23 24 25 26 27 28 29 30 31
Panel Width 19-7/8" 20-13/16" 21-3/4" 22-11/16" 23-5/8" 24-9/16" 25-1/2" 26-7/16" 27-3/8" 28-5/16"
Number of Bearing Bars 32 33 34 35 36 37 38 39
Panel Width 29-1/4" 30-3/16" 31-1/8" 32-1/16" 33" 33-15/16" 34-7/8" 35-13/16"

Panel widths indicated are for gratings with 3/16" thick bearing bars. For 1/8" thick bearing bars deduct 1/16" from the stated values. Add 1/4" to ail dimensions for extended cross bars on all aluminum products.

19 Space Load Table

Use this table when evaluating spans and loads for the following types of aluminum grating:
19-SG-4, 19-SG-2, 19-SGI-4, 19-SGI-2, 19-SGF-4, 19-SGF-2, 19-ADT-4 and 19-ADT-2.

19 Space Load Table
Bearing Bar Size Approx.
Weight
Psf*
Maximum
Pedestrian
Span**
Unsupported Span
2'-0" 2'-6" 3'-0" 3'-6" 4'-0" 4'-6" 5'-0" 5'-6" 6'-0" 6'-6" 7'-0" 8'-0"
3/4" × 3/16" 1.9 2'-11" U 355 227 158 116 All loads and deflections are theoretical and based upon the gross sections of the bearing bars, using a fiber stress of 12.000 psi.
D .192 .300 .432 .588
3/4" l-Bar 1.7 C 355 284 237 203
D .154 .240 .346 .470
1" × 1/8" 1.7 3'-3" U 421 270 187 138 105 The values are not intended to be absolute since the actual load capacity will be affected by the slight variations in mill and manufacturing tolerances.
D .144 .225 .324 .441 .576
C 421 337 281 241 211
D .115 .180 .259 .353 .461
1" × 3/16" 2.5 3'-8" U 632 404 281 206 158 125 Grating for spans to the left of the heavy line have a deflection ≤ 1/4" for uniform loads of 100 psi.
U = Safe Uniform Load in pounds/sq. foot
C = Concentrated Load in pounds/foot of grating width
D = Deflection in inches
D .144 .225 .324 .441 .576 .729
1" l-Bar 2.0 C 632 505 421 361 316 281
D .115 .180 .259 .353 .461 .583
1-1/4" × 1/8" 2.1 3'-11" U 658 421 292 215 165 130
D .115 .180 .259 .353 .461 .583
C 658 526 439 376 329 292
D .092 .144 .207 .282 .369 .467
1-1/4" × 3/16" 3.1 4'-4" U 987 632 439 322 247 195 158 131 110
D .115 .180 .259 .353 .461 .583 .720 .871 1.037
1-1/4" I-Bar 2.4 C 987 790 658 564 493 439 395 359 329
D .092 .144 .207 .282 .369 .467 .576 .697 .829
1-1/2" × 1/8" 2.5 4'-5" U 947 606 421 309 237 187 152 125 105 90 77 59
D .096 .150 .216 .294 .384 .486 .600 .726 .864 1.014 1.176 1.536
C 947 758 632 541 474 421 379 345 316 292 271 237
D .077 .120 .173 .235 .307 .389 .480 .581 .691 .811 .941 1.229
1-1/2 × 3/16 3.7 4'-11" U 1421 910 632 464 355 281 227 188 158 135 116 89
D .096 .150 .216 .294 .384 .486 .600 .726 .864 1.014 1.176 1.536
1-1/2" I-Bar 2.7 C 1421 1137 947 812 711 632 568 517 474 437 406 355
D .077 .120 .173 .235 .307 .389 .480 .581 .691 .811 .941 1.229
1-3/4" × 1/8" 2.9 5'-0" U 1290 825 573 421 322 255 206 171 143 122 105 81
D .082 .129 .185 .252 .329 .417 .514 .622 .741 .869 1.008 1.317
C 1290 1032 860 737 645 573 516 469 430 397 368 322
D .066 .103 .148 .202 .263 .333 .411 .498 .592 .695 .806 1.053
1-3/4" × 3/16" 4.2 5'-6" U 1934 1238 860 632 484 382 310 256 215 183 158 121
D .082 .129 .185 .252 .329 .417 .514 .622 .741 .869 1.008 1.317
1-3/4" I-Bar 3.1 C 1934 1547 1290 1105 967 860 774 703 645 595 553 484
D .066 .103 .148 .202 .263 .333 .411 .498 .592 .695 .806 1.053
2" × 1/8" 3.3 5'-6" U 1684 1078 749 550 421 333 270 223 187 160 138 105
D .072 .113 .162 .221 .288 .365 .450 .545 .648 .761 .882 1.152
C 1684 1347 1123 962 842 749 674 612 561 518 481 421
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2" × 3/16" 4.8 6'-1" U 2526 1617 1123 825 632 499 404 334 281 239 206 158
D .072 .113 .162 .221 .288 .365 .450 .545 .648 .761 .882 1.152
2" I-Bar 3.5 C 2526 2021 1684 1444 1263 1123 1011 919 842 777 722 632
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2-1/4" × 3/16" 5.4 6'-8" U 3197 2046 1421 1044 799 632 512 423 355 303 261 200
D .064 .100 .144 .196 .256 .324 .400 .484 .576 .676 .784 1.024
2-1/4" I-Bar 3.8 C 3197 2558 2132 1827 1599 1421 1279 1163 1066 984 914 799
D .051 .080 .115 .157 .205 .259 .320 .387 .461 .541 .627 .819
2-1/2" × 3/16" 5.9 7'-3" U 3947 2526 1754 1289 987 780 632 522 439 374 322 247
D .058 .090 .130 .176 .230 .292 .360 .436 .518 .608 .706 .922
2-1/2" I-Bar 4.2 C 3947 3158 2632 2256 1974 1754 1579 1435 1316 1215 1128 987
D .046 .072 .104 .141 .184 .233 .288 .348 .415 .487 .564 .737

*Weight per square foot based upon 19-SG-4 grating. Add 0.30 psf for 2" on center cross bars.

**Maximum pedestrian load is defined as a 100# Uniform Load with deflection ≤ 1/4 inch.

The 1/4" maximum deflection criteria is considered consistent with pedestrian comfort, but may be exceeded for other loading conditions at the discretion of the specifying authority.

Note: When gratings with serrated surface are specified, the depth of the grating required for a specific load will be 1/4" greater than that shown in these tables.

Panel Widths

Grating panels are available from stock in nominal 24" and 36" widths. When considering alternative widths, consult this table to select widths that will maintain uniform "out-to-out" spacing of the bearing bars. Specified widths deviating from this table will be fabricated to size with side banding and the bar spacing on one side of the finished panel will deviate from the spacing throughout the remainder of the panel.

Panel Widths
Number of Bearing Bars 2 3 4 5 6 7 8 9 10 11
Panel Width 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"
Number of Bearing Bars 12 13 14 15 16 17 18 19 20 21
Panel Width 13-1/4" 14-7/16" 15-5/8" 16-13/16" 18" 19-3/16" 20-3/8" 21-9/16" 22-3/4" 23-15/16"
Number of Bearing Bars 22 23 24 25 26 27 28 29 30 31
Panel Width 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"

Panel widths indicated are for gratings with 3/16" thick bearing bars. For 1/8" thick bearing bars deduct 1/16" from the stated values. Add 1/4" to ail dimensions for extended cross bars on all aluminum products.