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Dimensional
Tolerances

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OUTSIDE DIAMETER ***

HUB
When O.D. is 24" or less ± .06" Welding Neck
When O.D. is over 24" ± .12" Outside Diameter of hub at point of Weld

INSIDE DIAMETER

 5" and smaller + .09" - .03"
Slip-On, Lap Joint 6" and larger + .16" - .03"
10" and smaller + .03" - .0" Long Welding Neck ( O.D. of Neck )
12" to 24" + .06" - .0" All Sizes + .12" - .0"
26" and larger + .09" - .0"

WELDING NECK, LONG WELDING NECK

DRILLING
10" and smaller ± .03" Bolt Circle Diameter ± .06"
12" to 18" ± .06" Bolt Hole Spacing ± .03"
20" and larger + .12" - .06" Eccentricity of Bolt Circle and Facing .03" Max

DIAMETER OF CONTACT FACE

OVERALL HEIGHT
1/16" Raised Face ± .03" Threaded, Slip-On, Lap Joint***
1/4" Raised Face, Tongue and Groove, All Sizes ± .06"
Male or Female ± .02"
Ring Joint Facing*** +.060" -.0" Welding Neck

DIAMETER OF COUNTERBORE

 4" and smaller ± .06"
Threaded 5" to 10" + .06" - .12"
10" and smaller + .03" - .0" 12" and larger + .12" - .18"
12" and larger + .06" - .0"
Socket Weld

DEPTH OF SOCKET WELD***
3" and smaller ± .01" All Sizes + .03" - .0"

FLANGE THICKNESS
18" and smaller + .12" - .0"
Over 18" + .19" - .0"

Notes:
Thickness of Hub at Point of Weld:
Not less than 871⁄2 % of the nominal thickness of the pipe to which the flange is to be attached.
Ring Joint Facing:
Diameter of raised portion minimum. Depth of groove should not exceed minimum flange thickness; (also refer GDL-QA-031)

Although great care has been taken in compiling the information contained in this catalogue, Western Forge & Flange does not accept responsibility for the consequences of any errors, nor for the effects of any subsequent changes made by the various sources of data. GDL-IN-009 Rev. 1 08/05/2019
*** Not covered by B16.5, added for completeness

Dimensions of a

Pipe | Bore Chart |
Wall Thickness

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NOM PIPE SIZE PIPE OD. WALL I.D. SCH 5S SCH 10S SCH 10 SCH 20 SCH 30 STD & SCH 40S SCH 40 SCH 60 XH & SCH 80S SCH 80 SCH 100 SCH 120 SCH 140 SCH 160 XX HVY
1/2" .840 WALL .065 .083 .083 .109 .109 .147 .147 .188 .294
I.D. .710 .674 .674 .622 .622 .546 .546 .464 .252
3/4" 1.05 WALL .065 .083 .083 .113 .113 .154 .154 .219 .308
I.D. .920 .884 .884 .824 .824 .742 .742 .612 .434
1" 1.315 WALL .065 .109 .109 .133 .133 .179 .179 .250 .358
I.D. 1.185 1.097 1.097 1.049 1.049 .957 .957 .815 .599
1 1/4" 1.66 WALL .065 .109 .109 .140 .140 .191 .191 .250 .382
I.D. 1.530 1.442 1.442 1.380 1.380 1.278 1.278 1.160 .896
1 1/2" 1.90 WALL .065 .109 .109 .145 .145 .200 .200 .281 .400
I.D. 1.770 1.682 1.682 1.610 1.610 1.500 1.500 1.338 1.100
2" 2.375 WALL .065 .109 .109 .154 .154 .218 .218 .344 .436
I.D. 2.245 2.157 2.157 2.067 2.067 1.939 1.939 1.687 1.503
2 1/2" 2.875 WALL .083 .120 .120 .203 .203 .276 .276 .375 .552
I.D. 2.709 2.635 2.635 2.469 2.469 2.323 2.323 2.125 1.771
3" 3.50 WALL .083 .120 .120 .216 .216 .300 .300 .438 .600
I.D. 3.334 3.260 3.260 3.068 3.068 2.900 2.900 2.624 2.300
3 1/2" 4.00 WALL .083 .120 .120 .226 .226 .318 .318 .636
I.D. 3.834 3.760 3.760 3.548 3.548 3.364 3.364 2.728
4" 4.50 WALL .083 .120 .120 .237 .237 .337 .337 .438 .531 .674
I.D. 4.334 4.260 4.260 4.026 4.026 3.826 3.826 3.624 3.438 3.152
5" 5.563 WALL .109 .134 .134 .258 .258 .375 .375 .500 .625 .750
I.D. 5.345 5.295 5.295 5.047 5.047 4.813 4.813 4.563 4.313 4.063
6" 6.625 WALL .109 .134 .134 .280 .280 .432 .432 .562 .719 .864
I.D. 6.407 6.357 6.357 6.065 6.065 5.761 5.761 5.501 5.187 4.897
8" 8.625 WALL .109 .148 .148 .250 .277 .322 .322 .406 .500 .500 .594 .719 .812 .906 .875
I.D. 8.407 8.329 8.329 8.125 8.071 7.981 7.981 7.813 7.625 7.625 7.437 7.187 7.001 6.813 6.875
10" 10.75 WALL .134 .165 .165 .250 .307 .365 .365 .500 .500 .594 .719 .844 1.000 1.125 1.000
I.D. 10.482 10.420 10.420 10.250 10.136 10.020 10.020 9.750 9.750 9.562 9.312 9.062 8.750 8.500 8.750
12" 12.75 WALL .156 .180 .180 .250 .330 .375 .406 .562 .500 .688 .844 1.000 1.125 1.312 1.000
I.D. 12.438 12.390 12.390 12.250 12.090 12.000 11.938 11.626 11.750 11.374 11.062 10.750 10.500 10.126 10.750
14" 14.00 WALL .156 .188 .250 .312 .375 .375 .438 .594 .500 .750 .938 1.094 1.250 1.406
I.D. 13.688 13.624 13.500 13.376 13.250 13.250 13.124 12.812 13.000 12.500 12.124 11.812 11.500 11.188
16" 16.00 WALL .165 .188 .250 .312 .375 .375 .500 .656 .500 .844 1.031 1.219 1.438 1.594
I.D. 15.670 15.624 15.500 15.376 15.250 15.250 15.000 14.688 15.000 14.312 13.938 13.562 13.124 12.812
18" 18.00 WALL .165 .188 .250 .312 .438 .375 .562 .750 .500 .938 1.156 1.375 1.562 1.781
I.D. 17.670 17.624 17.500 17.376 17.124 17.250 16.876 16.500 17.000 16.124 15.688 15.250 14.876 14.438
20" 20.00 WALL .188 .218 .250 .375 .500 .375 .594 .812 .500 1.031 1.281 1.500 1.750 1.969
I.D. 19.624 19.564 19.500 19.250 19.000 19.250 18.812 18.376 19.000 17.938 17.438 17.000 16.500 16.062
22" 22.00 WALL .188 .218 .250 .375 .500
I.D. 21.624 21.564 21.500 21.250 21.000
24" 24.00 WALL .218 .250 .250 .375 .562 .375 .688 .969 .500 1.219 1.531 1.812 2.062 2.344
I.D. 23.564 23.500 23.500 23.250 22.876 23.250 22.624 22.062 23.000 21.562 20.938 20.376 19.876 19.312
26" 26.00 WALL .375 .500
I.D. 25.250 25.000
30" 30.00 WALL .250 .312 .312 .500 .625 .375 .500
I.D. 29.500 29.376 29.376 29.000 28.750 29.250 29.000
36" 36.00 WALL .312 .500 .625 .375 .750 .500
I.D. 35.376 35.000 34.750 35.250 34.500 35.000
40" 40.00 WALL .375 .500
I.D. 39.250 39.000
42" 42.00 WALL .375 .500
I.D. 41.250 41.000

Although great care has been taken in compiling the information contained in this catalogue, Western Forge & Flange does not accept responsibility for the consequences of any errors, nor for the effects of any subsequent changes made by the various sources of data. GDL-IN-009 Rev. 1 08/05/2019