Designation Description Page External, left hand, full profile (UN, UNC, UNF, 1198 American UN UNEF) ANSI B1, 3M-1986 CLASS 2A External, right hand, full profile (UN, UNC, UNF, 1199 American UN UNEF) ANSI B1, 3M-1986 CLASS 2A External, right hand, pressed, full profile (UN, 1200 American UN (M-type) UNC, UNF, UNEF) ANSI B1, 3M-1986 CLASS 2A External, full profile (UN, UNC, UNF, UNEF) ANSI 1201 American UN (U-type) B1, 3M-1986 CLASS 2A Internal, left hand, full profile (UN, UNC, UNF, 1202 American UN UNEF) ANSI B1, 3M-1986 CLASS 2A Internal, right hand, full profile (UN, UNC, UNF, 1204 American UN (UN, UNC, UNF, UNEF) UNEF) ANSI B1, 3M - 1986 CLASS 2A Internal, right hand, pressed, full profile (UN, 1206 American UN UNC, UNF, UNEF) ANSI B1, 3M-1986 CLASS 2A Internal, full profile (UN, UNC, UNF, UNEF) ANSI 1207 American UN B1, 3M-1986 CLASS 2A External, left hand, full profile (BSW, BSF, BSP) 1208 Whitworth BS.84-1956 DIN 259 MEDIUM CLASS External, right hand, full profile (BSW, BSF, BSP) Whitworth BS.84-1956 DIN 259 MEDIUM CLASS 1209 External, right hand, pressed, full profile (BSW, 1210 Whitworth (M-type) BSF, BSP) BS.84-1956 DIN 259 MEDIUM CLASS Internal, left hand, full profile (BSW, BSF, BSP) 1212 Whitworth BS.84-1956 DIN 259 MEDIUM CLASS 1179