P MTH-W (int. & ext.) W External & Internal Whitworth (BSW, l BSF, BSP) Helical Thread Milling Inserts for Fittings and Pipe Couplings S P NUT Dimensions 55° R=0.137P SCREW Designation TPI l W S Int Thrd Ext Thrd IC908 MTH 23 14 W 14.0 27.00 8.00 3.50 ≥G7/8" >G1/2" • MTH 23 11 W 11.0 27.00 8.00 3.50 ≥G1" >G1" • MTH 32 14 W 14.0 32.00 9.00 4.00 ≥G1/2" • MTH 32 11 W 11.0 32.00 9.00 4.00 ≥G1_1/8" >G1" • MTH 45 11 W 11.0 37.00 11.90 5.00 ≥G1_3/4" >G1" • MTH 63 11 W 11.0 38.00 11.90 5.00 ≥G2_1/2" >G1" • • For cutting speed recommendations, see pages 372-373 For tools, see pages: MTSRH (endmills) (360) • MTSRH (helical shell mill) (361) THREAD MILLING TOOLS P MTH-BSPT (int. & ext.) W Helical External & Internal Thread l Milling Inserts for BSPT Thread for Steam, Gas and Water Pipes S P NUT Dimensions 27.5° 27.5° R=0.137P 90° Taper 1:16 SCREW BSPT Designation TPI l W S Int Thrd Ext Thrd IC908 MTH 23 11 BSPT 11.0 27.00 8.00 3.50 >1" BSPT >1" BSPT • MTH 32 11 BSPT 11.0 32.00 9.00 4.00 >1_1/8" BSPT >1" BSPT • MTH 45 11 BSPT 11.0 37.00 11.90 5.00 >1_3/4" BSPT >1" BSPT • MTH 63 11 BSPT 11.0 38.00 11.90 5.00 >2_1/2 BSPT >1" BSPT • • For cutting speed recommendations, see pages 372-373 For tools, see pages: MTSRH (endmills) (360) • MTSRH (helical shell mill) (361) P MTH-NPT (int. & ext.) W External & Internal NPT Helical l Thread Milling Inserts for Steam, Gas and Water Pipes S P NUT Dimensions 30° 30° 90° Taper 1:16 SCREW Designation TPI l W S Int Thrd Ext Thrd IC908 MTH 23 11.5 NPT 11.5 27.00 8.00 3.50 1-2" NPT 1-2" NPT • MTH 32 11.5 NPT 11.5 32.00 9.00 4.00 1_1/4"-2" NPT 1-2" NPT • MTH 45 11.5 NPT 11.5 37.00 11.90 5.00 2" NPT 1-2" NPT • MTH 45 8 NPT 8.0 37.00 11.90 5.00 2_1/2"-3" NPT - • MTH 63 11.5 NPT 11.5 38.00 11.90 5.00 - 1-2" NPT • MTH 63 8 NPT 8.0 38.00 11.90 5.00 2_1/2"-3" NPT - • • For cutting speed recommendations, see pages 372-373 For tools, see pages: MTSRH (endmills) (360) • MTSRH (helical shell mill) (361) 370 ISCAR