THREAD MILLING TOOLS TP MTH-W (int. & ext.) W1 External & Internal Whitworth (BSW, BSF, BSP) Helical lNSL Thread Milling Inserts for Fittings and Pipe Couplings S1 TP NUT Dimensions 55° RE=0.137TP SCREW IC908 Designation TPI(1) INSL W1 S1 THID(2) THOD(3) TP(4) MTH 23 14 W 14.0 27.00 8.00 3.50 =>G7/8" >G1/2" 1.814 • MTH 23 11 W 11.0 27.00 8.00 3.50 =>G1" >G1" 2.309 • MTH 32 14 W 14.0 32.00 9.00 4.00 - =>G1/2" 1.814 • MTH 32 11 W 11.0 32.00 9.00 4.00 =>G1_1/8" >G1" 2.309 • MTH 45 11 W 11.0 37.00 11.90 5.00 =>G1_3/4" >G1" 2.309 • MTH 63 11 W 11.0 38.00 11.90 5.00 =>G2_1/2" >G1" 2.309 • • For cutting speed recommendations, see page 497 • Internal tolerance: ISO 228-1 Medium class • External tolerance: ISO 228-1 Medium class (1) Threads per inch (2) Internal thread designation (3) External thread designation (4) Thread pitch For tools, see pages: MTSRH (endmills) (476) • MTSRH (helical shell mill) (477) TP MTH-BSPT (int. & ext.) W1 Helical External & Internal Thread Milling Inserts for BSPT Thread lNSL for Steam, Gas and Water Pipes S1 TP NUT 27.5° 27.5° Dimensions RE=0.137TP 90° Taper 1:16 SCREW BSPT IC908 Designation TPI(1) INSL W1 S1 THID(2) THOD(3) TP(4) MTH 23 11 BSPT 11.0 27.00 8.00 3.50 >1" BSPT >1" BSPT 2.309 • MTH 32 11 BSPT 11.0 32.00 9.00 4.00 >1_1/8" BSPT >1" BSPT 2.309 • MTH 45 11 BSPT 11.0 37.00 11.90 5.00 >1_3/4" BSPT >1" BSPT 2.309 • MTH 63 11 BSPT 11.0 38.00 11.90 5.00 >2_1/2 BSPT >1" BSPT 2.309 • • For cutting speed recommendations, see page 497 (1) Threads per inch (2) Internal thread designation (3) External thread designation (4) Thread pitch For tools, see pages: MTSRH (endmills) (476) • MTSRH (helical shell mill) (477) 493