Awwa Flanges

These standards are predicated on the user of either a cloth-inserted rubber gasket 1/16 in. thick or an absestos ring gasket that is either 1/16 in. or 1/8 in. thick, at the purchaser's option. The gasket shall extend from the inside diameter of the flange to at least the inside edge of the bolt holes, or it may.

2. Gaskets

All bolts and nuts shall be threaded in accordance with ANSI B1.1 for screw threads, coarse-thread series, Class 2A and 2B fit.

Bolts and nuts shall be carbon steel ASTM A307, Grades A or B. Bolts shall have regular unfinished square or hexagonal heads, and nuts shall have regular square or hexagonal dimensions all in accordance with ANSI B18.21 for wrench head bolts and nuts and wrench openings.

1. Bolting

Note: For other dimensional tolerances, see ANSI B16.5, page 49

Note: For other dimensional tolerances, see ANSI B16.5, page 49