... ,stainless steel flanges) 1.Materia:304,316,347,321,301,625,800 2.Standard: ASME, ANSI, API, JIS, JPI, ... is similar to slip-on flange, except they a bore and a counter bore. The counter bore is slightly larger ... the matching pipe, allowing the pipe to be inserted. A restriction is built into the bottom of the bore, ... which acts as a shoulder for the pipe to rest on, and has ...