TMPG_US-EN

Speeds and Feeds | Imperial

Hardness (BHN) 140 - 220 220 - 310 135 - 185

Speed (SFM)

Material

ISO

Machinability*

Difficult Difficult Difficult

100

S High Temp Alloy

Hastelloy B, Inconel 600

75

Stainless Steel 303, 416, 420 Stainless Steel PH

425 400 250 125 325 225 550 500 450 400 375

185 - 275 Difficult 185 - 275 Difficult 275 - 325 Difficult

M

17-4

Tool Steel

150 - 200 200 - 250 120 - 150 150 - 200 200 - 220 220 - 260 260 - 320

Difficult Difficult

H-13, H21, A-4

Cast Iron

Easy Easy Easy

Grey, Ductile, Nodular

K

Average Average

Wrought Aluminum

30

Easy Easy Easy Easy

1000

6061 T6

180 120

900 500

N

Cast Aluminum ** up to 10% silicon

Brass

30 - 125

1000

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.

36 | THREAD MILLING REFERENCE GUIDE