We are offering flanges.material specification : a182f304, f304l, f316, f316l, f321, f22, f11, aisi 304, 304l, 316, 316l, 321, a350 gr lf2, monel. A105, a515 gr 6070, a516 gr 6070, is-2062, is-2002, a285 gr c. dimensional standards : ansi, awwa, mssp, din, bs, is, uni, jis, api type of flange facing : raised face (r.f) serrated, rf smooth, flat face (ff), ring joint, tongue & groove sizes & pressure ratings : for 'slip on & blind type : 12" (15 nb) to 24" (600nb) in all pressure ratings.For socket-weld & threaded type : 12" (15 nb) to 3" (80nb) in all pressure ratings.For weld-neck type : 12" (15 nb) to 2" (50nb) pressure rating 150 lbs to 2500 lbs 3" (80 nb) to 8" (200nb) pressure rating 150 lbs to 300 lbs