TMPG_US-EN

Speeds and Feeds | Imperial

Hardness (BHN) 100 - 150 150 - 200 200 - 250 125 - 175 175 - 225 225 - 275 125 - 175 175 - 225 225 - 275 275 - 325 125 - 175 175 - 225 225 - 275

Speed (SFM)

Material

ISO

Machinability* Easy

Free Machining Steel 1118, 1215, 12L14, etc.

725 550 450 725 550 450 400 450 400 350 300 450 400 350 300 250 350 300 250 450 400

Easy Easy

Low Carbon Steel 1010, 1020, 1025,

85 - 125 Average

Average Average Average Average Average Average Average Average Average Average

1522, 1144

Medium Carbon Steel 1010, 1040, 1050,

1527, 1140

P

Alloy Steel

4140, 5140, 8640

275 - 325 Difficult 325 - 375 Difficult 225 - 300 Average

High Strength Alloy 4340, 4330V, 300M

300 - 350 350 - 400

Difficult Difficult

Structural Steel A36, A285, A516

100 - 150 Average 150 - 250 Average

250 - 350 300 NOTE: Feed rates provided are safe starting recommendations and may be increased to reduce cycle times. Solid carbide thread mills may perform at double or triple these feed recommendations. Difficult

34 | THREAD MILLING REFERENCE GUIDE