
THREAD MILLING TOOLS TP MTH-UN (internal) W1 Helical Thread Milling Inserts for American Full Profile lNSL Internal Threading Intended for General Applications S1 NUT TP Dimensions TP/4 60° TP/8 SCREW IC908 Designation TPI(1) INSL W1 S1 THID(2) TP(3) MTH 23 I 32 UN 32.0 27.00 8.00 3.50 =>1" 0.794 • MTH 23 I 24 UN 24.0 27.00 8.00 3.50 =>1" 1.058 • MTH 23 I 20 UN 20.0 27.00 8.00 3.50 =>1" 1.270 • MTH 23 I 18 UN 18.0 27.00 8.00 3.50 =>1_1/16" 1.411 • MTH 23 I 16 UN 16.0 27.00 8.00 3.50 =>1_1/16" 1.588 • MTH 23 I 14 UN 14.0 27.00 8.00 3.50 =>1_1/8" 1.814 • MTH 23 I 12 UN 12.0 27.00 8.00 3.50 =>1_1/8" 2.117 • MTH 23 I 10 UN 10.0 27.00 8.00 3.50 =>1_1/8" 2.540 • MTH 23 I 8 UN 8.0 27.00 8.00 3.50 =>1_3/16" 3.175 • MTH 23 I 7 UN 7.0 27.00 8.00 3.50 =>1_1/4" 3.629 • MTH 32 I 20 UN 20.0 32.00 9.00 4.00 =>1_3/8" 1.270 • MTH 32 I 18 UN 18.0 32.00 9.00 4.00 =>1_3/8" 1.411 • MTH 32 I 16 UN 16.0 32.00 9.00 4.00 =>1_3/8" 1.588 • MTH 32 I 12 UN 12.0 32.00 9.00 4.00 =>1_7/16" 2.117 • MTH 32 I 8 UN 8.0 32.00 9.00 4.00 =>1_1/2" 3.175 • MTH 32 I 6 UN 6.0 32.00 9.00 4.00 =>1_5/8" 4.233 • MTH 32 I 5 UN 5.0 32.00 9.00 4.00 =>1_3/4" 5.080 • MTH 45 I 16 UN 16.0 37.00 11.90 5.00 =>2" 1.588 • MTH 45 I 12 UN 12.0 37.00 11.90 5.00 =>2" 2.117 • MTH 45 I 8 UN 8.0 37.00 11.90 5.00 =>2_1/4" 3.175 • MTH 45 I 6 UN 6.0 37.00 11.90 5.00 =>2_1/4" 4.233 • MTH 45 I 4.5 UN 4.5 37.00 11.90 5.00 =>2_1/4" 5.644 • MTH 45 I 4 UN 4.0 37.00 11.90 5.00 =>2_1/2" 6.350 • MTH 63 I 16 UN 16.0 38.00 11.90 5.00 =>2_3/4" 1.588 • MTH 63 I 12 UN 12.0 38.00 11.90 5.00 =>2_3/4" 2.117 • MTH 63 I 8 UN 8.0 38.00 11.90 5.00 =>3" 3.175 • MTH 63 I 6 UN 6.0 38.00 11.90 5.00 =>3" 4.233 • MTH 63 I 4 UN 4.0 38.00 11.90 5.00 =>3" 6.350 • • Used for UN, UNC, UNF, UNEF and UNS thread profiles • For cutting speed recommendations, see page 497 (1) Threads per inch (2) Internal thread designation (3) Thread pitch For tools, see pages: MTSRH (endmills) (476) • MTSRH (helical shell mill) (477) 492 ISCAR