Note:
- Ring flanges available overbored or counterbored per customer specification.
- Bolt holes shall be drilled 1/8th inch larger in diameter than the nominal diameter of the bolt, except for flanges larger than 84 inch in diameter which shall be drilled 3/16th inch larger than the nominal diameter of the bolt.
- Drilling same as ANSI/ASME B16.1 125 lb and B16.5 150 lb pattern.
- Flanges available overdrilled to accommodate insulators.
- AWWA recommends the use of dished head assemblies as alternate to blind flanges, sizes over 72" nominal.
- AWWA C207-01 Class B and D Hub Flanges are identical to Industry Standard Class 125 Light Weight Flanges.
These tolerances are a part of ANSI B16.5 and AWWA C207-01 Sec. 4.2 except where noted otherwise.