Specification :ASME B16.9 11 ElbowSize Chart Of Threaded Elbow:1/8” NB to 4” NB (Screwed-Socket)Forged Type :NPT (Threaded), BSPT, BSPP.Elbow SW Dimensions Class:2000#, 3000#, 6000#, 9000#Standard Of 45 Degree Npt Elbow:JISB2311, IS 2062, DIN, ANSI B16.28, ASME B16.9, BS10, ASME B16.47, ASME B16.38,