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SOCKET/COUPLING AMERICAN STANDARD:ANSI/ASTM A120 BRITISH STANDARD:BS EN10241 DIN STANDARD:DIN2986 STEEL PIPE NIPPLES AMERICAN STANDARD: ASTM A733 PIPE:ASTM A53,A120,A312,TP304 THREAD:ANSI B1.20.1 BRITISH STANDARD:BS EN1024 PIPE:BS1387 THREAD:ISO 7/1,BS21 DIN STANDARD:DIN292 PIPE:DIN2440 THREAD:DIN2999 SOCKETS BSEN 10241:2000 Socket Type Medium ND Inch 1/8″ 1/4″ 3/8″ 1/2″ 3/4″ 1″ 11/4″ 11/2″ 2″ 21/2″ 3″ 4″ 5″ 6″ mm 6 8 10 15 20 25 32 40 50 65 80 100 125 150 Outside Diameter(min) mm 14 18.5 21.3 26.4 31.8 39.5 48.3 54.8 66.3 82 95 122 147 174 Length(min) mm 17 25 26 34 36 46 48 48 56 65 71 83 92 92 BSEN 10241:2000 Socket Type Heavy ND Inch 1/4″ 3/8″ 1/2″ 3/4″ 1″ 11/4″ 11/2″ 2″ 21/2″ 3″ 4″ 5″ 6″ mm 8 10 15 20 25 32 40 50 65 80 100 125 150 Outside Diameter(min) mm 18.5 22 27 32.5 39.5 49 56 68 84 98 124 151 178 Length(min) mm 27 28 37 39 46 51 51 60 69 75 87 96 96 Note:Thread Standard BS21 Socket thread refers interal parallel thread