Pro/Calc
Material Directory - Spindle Speed Calculator

DESCRIPTION OF STEEL CLASSES
Material
Code

A2

A36

D2

H13

O1

S7

6AL-4V

1018

1040

1117

1137

12L14

17-4PH

203

301

303

304
Brinell
Hardness

225

170

225

250

225

200

300

175

250

150

200

150

175

200

250

200

250

DESCRIPTION

Tool steel

Structural steel/iron

Tool steel

Tool steel

Tool steel

Tool steel

T16A1-4V Titanium

Free machining carbon steel

Free machining carbon steel

Free machining carbon steel

Free machining carbon steel

Free machining carbon steel, leaded

Precipitation hardening stainless

Stainless, free machining

Stainless

Stainless, free machining

Stainless
Material
Code

410

431

440C

4130

4140

4150

41L45

4340

4620

5160

6061T

6150

8620
Brinell
Hardness

200

250

250

250

325

325

250

275

250

250

100

250

225
DESCRIPTION

Stainless

Stainless

Stainless

Free machining alloy steel

Free machining alloy steel

Free machining alloy steel

Free machining alloy steel, leaded

Alloy steel

Alloy steel

Alloy steel

Aluminum

Alloy steel

Alloy steel
*HEAT TREATED
1040*

4140*

4340*

8620*
400 B

40 RC

50 RC

350 B
Free machining carbon steel

Free machining alloy steel

Alloy steel

Alloy steel
Note:
B = Brinell Hardness
RC = Rockwell Hardness
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