Threading Inserts WHITWORTH BSW, BSF, BSP INTERNAL B.S.84: 1956 B ISO 228-1: 1994 A W NUT R 0.137P 55° L R 0.137P I.C. W SCREW PITCH CATALOG NUMBER DIMENSIONS RIGHT HAND LEFT HAND L I.C. A B TPI mm 72 W72 IR16 W72 IL16 0.7 0.4 60 W60 IR16 W60 IL16 0.7 0.4 56 W56 IR16 W56 IL16 0.7 0.4 48 W48 IR16 W48 IL16 0.6 0.6 40 W 40 IR16 W 40 IL16 0.6 0.6 36 W36 IR16 W36 IL16 0.6 0.6 32 W 32 IR16 W 32 IL16 0.6 0.6 28 W 28 IR16 W 28 IL16 0.6 0.7 26 W 26 IR16 W 26 IL16 0.7 0.8 24 W 24 IR16 W 24 IL16 0.7 0.8 22 W 22 IR16 W 22 IL16 16 9.525 0.8 0.9 20 W 20 IR16 W 20 IL16 0.8 1.0 19 W 19 IR16 W 19 IL16 0.8 1.0 18 W 18 IR16 W 18 IL16 0.8 1.0 16 W 16 IR16 W 16 IL16 0.9 1.1 14 W 14 IR16 W 14 IL16 1.0 1.2 12 W 12 IR16 W 12 IL16 1.1 1.4 11 W 11 IR16 W 11 IL16 1.1 1.5 10 W 10 IR16 W 10 IL16 1.1 1.5 9 W 9 IR16 W 9 IL16 1.2 1.7 8 W 8 IR16 W 8 IL16 1.2 1.5 23