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| you are here: Home > Weldbend Catalog > Technical Data > Weld Neck Flange Tolerances |
| Dimensional Tolerances |
| For Weldbend Forged Steel Pipe Flanges |
| Listed below are the dimensional tolerances to which Weldbend flanges are manufactured. These tolerances are a part of ASME B16.5 except where noted otherwise. The limits given are maximum. |
| Welding Neck** | ||
| Outside Diameter | When O.D. is 24" or Less | +.06" * |
| When O.D. is Over 24" | + .12" * | |
| Inside Diameter |
10" and Smaller + .03" |
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12" thru 18" + .06" |
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20" thru 24" + .12", - .06" |
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| Diameter of Contact Face |
0.06" Raised Face + .03" |
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| Diameter of Hub at Base | When "X" is 24" or Smaller | + .06" * |
| When "X" is Over 24" | + .12" * | |
| Diameter of Hub at Point of Welding | 5" and Smaller | + .09", - .03" |
| 6" and Larger | + .16", - .03" | |
| Drilling | Bolt Circle |
1/2" - 24" + .06" |
| Hole Spacing | + .03" * | |
| Eccentricity of Bolt Circle with Respect to Facing |
2 1/2" and Smaller .03" Max. |
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3" and Larger .06" Max. |
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| Eccentricity of Bolt Circle with Respect to Bore | .03" Max. * *** | |
| Eccentricity of Facing with Respect to Bore | .03" Max. * | |
| Thickness |
18" and Smaller + .12", - 0" |
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Over 18" + .19", - 0 |
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| Length Thru Hub |
10" and Smaller + .06" |
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12" thru 24" + .12" |
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