Threading Inserts WHITWORTH BSW, BSF, BSP EXTERNAL B.S.84: 1956 ISO 228-1: 1994 BA W NUT R 0.137P 55° L R 0.137P W SCREW I.C. PITCH CATALOG NUMBER DIMENSIONS TPI RIGHT HAND LEFT HAND Lmm I.C. A B 32 W 32 ER16 W 32 EL16 0.6 0.6 28 W 28 ER16 W 28 EL16 0.6 0.7 26 W 26 ER16 W 26 EL16 0.6 0.7 24 W 24 ER16 W 24 EL16 0.7 0.8 22 W 22 ER16 W 22 EL16 0.8 0.9 20 W 20 ER16 W 20 EL16 0.8 0.9 19 W 19 ER16 W 19 EL16 0.8 1.0 18 W 18 ER16 W 18 EL16 16 9.525 0.8 1.0 16 W 16 ER16 W 16 EL16 0.9 1.1 14 W 14 ER16 W 14 EL16 1.0 1.2 12 W 12 ER16 W 12 EL16 1.1 1.4 11 W 11 ER16 W 11 EL16 1.1 1.5 10 W 10 ER16 W 10 EL16 1.1 1.5 9 W 9 ER16 W 9 EL16 1.2 1.7 8 W 8 ER16 W 8 EL16 1.2 1.5 7 W 7 ER22 W 7 EL22 1.6 2.3 6 W 6 ER22 W 6 EL22 22 12.70 1.6 2.3 5 W 5 ER22 W 5 EL22 1.7 2.4 4.5 W 4.5 ER27 W 4.5 EL27 1.7 2.5 27 15.875 4 W 4 ER27 W 4 EL27 1.9 2.8 20