P MTH-UN (internal) W Helical Thread Milling Inserts l for American Full Profile Internal Threads for General Applications S NUT P Dimensions P/4 60° P/8 SCREW Designation TPI l W S Int Thrd IC908 MTH 23 I 32 UN 32.0 27.00 8.00 3.50 ≥1" • MTH 23 I 24 UN 24.0 27.00 8.00 3.50 ≥1" • MTH 23 I 20 UN 20.0 27.00 8.00 3.50 ≥1" • MTH 23 I 18 UN 18.0 27.00 8.00 3.50 ≥1_1/16" • MTH 23 I 16 UN 16.0 27.00 8.00 3.50 ≥1_1/16" • MTH 23 I 14 UN 14.0 27.00 8.00 3.50 ≥1_1/8" • MTH 23 I 12 UN 12.0 27.00 8.00 3.50 ≥1_1/8" • MTH 23 I 10 UN 10.0 27.00 8.00 3.50 ≥1_1/8" • MTH 23 I 8 UN 8.0 27.00 8.00 3.50 ≥1_3/16" • MTH 23 I 7 UN 7.0 27.00 8.00 3.50 ≥1_1/4" • THREAD MILLING TOOLS MTH 32 I 20 UN 20.0 32.00 9.00 4.00 ≥1_3/8" • MTH 32 I 18 UN 18.0 32.00 9.00 4.00 ≥1_3/8" • MTH 32 I 16 UN 16.0 32.00 9.00 4.00 ≥1_3/8" • MTH 32 I 12 UN 12.0 32.00 9.00 4.00 ≥1_7/16" • MTH 32 I 8 UN 8.0 32.00 9.00 4.00 ≥1_1/2" • MTH 32 I 6 UN 6.0 32.00 9.00 4.00 ≥1_5/8" • MTH 32 I 5 UN 5.0 32.00 9.00 4.00 ≥1_3/4" • MTH 45 I 16 UN 16.0 37.00 11.90 5.00 ≥2" • MTH 45 I 12 UN 12.0 37.00 11.90 5.00 ≥2" • MTH 45 I 8 UN 8.0 37.00 11.90 5.00 ≥2_1/4" • MTH 45 I 6 UN 6.0 37.00 11.90 5.00 ≥2_1/4" • MTH 45 I 4.5 UN 4.5 37.00 11.90 5.00 ≥2_1/4" • MTH 45 I 4 UN 4.0 37.00 11.90 5.00 ≥2_1/2" • MTH 63 I 16 UN 16.0 38.00 11.90 5.00 ≥2_3/4" • MTH 63 I 12 UN 12.0 38.00 11.90 5.00 ≥2_3/4" • MTH 63 I 8 UN 8.0 38.00 11.90 5.00 ≥3" • MTH 63 I 6 UN 6.0 38.00 11.90 5.00 ≥3" • MTH 63 I 4 UN 4.0 38.00 11.90 5.00 ≥3" • • Used for UN, UNC, UNF, UNEF and UNS thread profiles • For cutting speed recommendations, see pages 372-373 For tools, see pages: MTSRH (endmills) (360) • MTSRH (helical shell mill) (361) P MTH-UN (external) W Helical Thread Milling Inserts for l American Full Profile External Threads for General Applications S NUT P Dimensions P/4 60° P/8 SCREW Designation TPI l W S Ext Thrd IC908 MTH 23 E 20 UN 20.0 27.00 8.00 3.50 Ext. • MTH 23 E 18 UN 18.0 27.00 8.00 3.50 Ext. • MTH 23 E 16 UN 16.0 27.00 8.00 3.50 Ext. • MTH 23 E 14 UN 14.0 27.00 8.00 3.50 Ext. • MTH 23 E 12 UN 12.0 27.00 8.00 3.50 Ext. • MTH 23 E 10 UN 10.0 27.00 8.00 3.50 Ext. • MTH 23 E 8 UN 8.0 27.00 8.00 3.50 Ext. • MTH 23 E 7 UN 7.0 27.00 8.00 3.50 Ext. • MTH 32 E 24 UN 24.0 32.00 9.00 4.00 Ext. • MTH 32 E 20 UN 20.0 32.00 9.00 4.00 Ext. • MTH 32 E 18 UN 18.0 32.00 9.00 4.00 Ext. • MTH 32 E 16 UN 16.0 32.00 9.00 4.00 Ext. • MTH 32 E 12 UN 12.0 32.00 9.00 4.00 Ext. • MTH 32 E 8 UN 8.0 32.00 9.00 4.00 Ext. • MTH 32 E 6 UN 6.0 32.00 9.00 4.00 Ext. • • Used for UN, UNC, UNF, UNEF and UNS thread profiles • For cutting speed recommendations, see pages 372-373 For tools, see pages: MTSRH (endmills) (360) • MTSRH (helical shell mill) (361) 369