Specification of

Dimensions shown are for Raised Face and Flat Faced Flanged Datasheets

Dimensions to ASME B16.5 - Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
Bolt circle diameters are 1/8 inch larger than bolt diameter.
1/4" raised face is not included in dimension "C" and "M"