Spiral Mill-Thread Inserts Spiral Mill-Thread Inserts W 55°WHIT WORTH (BSW,BSF,BSP, BSB INTERNAL & EXTERNAL) BSPT 55°BRITISH STANDARD PIPE (INTERNAL & EXTERNAL) P R0.137P Nut P R0.137P Nut W 0 55° W 0 7.5° 27.5 R0.137P Screw R 0 . 1 3 7P /1°7’ Screw Thread Size Dimensions Thread Size Dimensions Designation TPI Designation TPI Internal External I W t Internal External I W t H23EI 14 W 14 >G 7/8" >G 1/2" 27 8.0 3.5 H23EI 11 BSPT 11 >1"BSPT >1"BSPT 27 8.0 3.5 H23EI 11 W 11 >G 1" >G 1" 27 8.0 3.5 H32EI 11 BSPT 11 >1 1/8"BSPT >1"BSPT 32 9.0 4.0 H32EI 14 W 14 >G 1/2" 32 9.0 4.0 H45EI 11 BSPT 11 >1 3/4"BSPT >1"BSPT 37 11.9 5.0 H32EI 11 W 11 >G 1 1/8" >G 1" 32 9.0 4.0 H63EI 11 BSPT 11 >2 1/2"BSPT >1"BSPT 38 11.9 5.0 H45EI 11 W 11 >G 1 3/4" >G 1" 37 11.9 5.0 H63EI 11 W 11 >G 2 1/2" >G 1" 38 11.9 5.0 HELICAL LONG EDGE FINISHING INSERT 085 W 55°WHIT WORTH (BSW,BSF,BSP, BSB INTERNAL & EXTERNAL) 086 p W o -> >< w 0 Dimensions Thread Size DimensionsDesignationTPI Designation I W t Internal External I W t H23F R0.20 27 8.0 3.5 H23EI 11 .5 NPT 11.5 1"-2"NPT 1"-2"NPT 27 8.0 3.5 H23F R0.50 27 8.0 3.5 H32EI 11.5 NPT 11.5 1 1/4"-2"NPT 1"-2"NPT 32 9.0 4.0 H23F R1.00 27 8.0 3.5 H45EI 11.5 NPT 11.5 2"NPT 1"-2"NPT 37 11.9 5.0 H32F R0.20 32 9.0 4.0 H45EI 8 NPT 8.0 2 1/2"NPT-3"NPT 2 1/2"NPT-3"NPT 37 11.9 5.0 H32F R0.50 32 9.0 4.0 H63EI 11.5 NPT 11.5 1"-2"NPT 38 11.9 5.0 H32F R1.00 32 9.0 4.0 H63EI 8 NPT 8.0 2 1/2"NPT-3"NPT 2 1/2"NPT-3"NPT 38 11.9 5.0 H45F R0.20 37 11.9 5.0