Designation Description Page Internal, right hand, full profile (BSW, BSF, BSP) 1214 Whitworth BS.84-1956 DIN 259 medium class Internal, right hand, pressed, full profile (BSW, 1216 Whitworth (M-type) BSF, BSP) BS.84-1956 DIN 259 medium class Internal, full profile (BSN, BSF, BSP) BS.84-1956 1216 Whitworth (U-type) DIN 259 medium class Internal and external, full profile (BSN, BSF, BSP) 1217 Whitworth (U-type) BS.84-1956 DIN 259 medium class External, full profile (ANSI/ASME B1.20.1-1983), 1218 NPT (National Pipe Thread) regular and M-type Internal, full profile (ANSI/ASME B1.20.1-1983), 1219 NPT (National Pipe Thread) regular and M-type External, full profile (ANSI/ASME B1.20.3-1976) 1220 NPT (National Pipe Thread - Dry Seal) Internal, full profile (ANSI/ASME B1.20.3-1976) 1221 NPT (National Pipe Thread - Dry Seal) External, full profile (B.S.21-1957) 1222 BSPT (British Standard Pipe Thread) Internal, full profile (B.S.21-1957) 1223 BSPT (British Standard Pipe Thread) External (ASME/ANSI B1.5-1988 CLASS 2G) 1224 Stub Acme Internal (ASME/ANSI B1.5-1988 CLASS 2G) 1225 Stub Acme 1180