... ,301, 2.Standard: ASME, ANSI, API, JIS, JPI,MSS flanges(flange gasket,stainless steel flanges)Threaded Flanges standard: ANSI/ASME B16.5, ANSI B16.47,AWWA ... /304L,F316/316L,321,A105 Certificate: >ISO9001:2000 Threaded flange is similar to slip-on flange, except they a bore and a counter ... , which acts as a shoulder for the pipe to rest on, and has the same ID of matching pipe. The flow ...