Filter by
Material
Diameter
Length
Hardness
Hardness Rating
Heat Treatment
Tolerance Rating
Shank Type
Mechanical Finish
System of Measurement
Yield Strength
For Use On
Export Control Classification Number (ECCN)
Elongation
Maximum Temperature
Appearance
Bevel Angle
About Steel
Compare over 50 grades of steel and cast iron to find the right material for you—all with material certificates for traceability.
Hardened High-Speed M42 Tool Steel

- Yield Strength: Not Rated
- Hardness: Rockwell C65 (Very Hard)
Also known as cobalt steel, this M42 tool steel maintains its hardness in high-speed cutting applications that generate intense heat. Use it to make tools for cutting extremely hard materials.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
Dia. | Dia. Tolerance | Lg. | Mechanical Finish | Each | |
1/64" | -0.0002" to 0" | 1 1/2" | Precision Ground | 0000000 | 00000 |
1/32" | -0.0002" to 0" | 1 1/2" | Precision Ground | 0000000 | 0000 |
3/64" | -0.0002" to 0" | 1 3/4" | Precision Ground | 0000000 | 0000 |
1/16" | -0.0002" to 0" | 1 7/8" | Precision Ground | 0000000 | 0000 |
5/64" | -0.0002" to 0" | 2" | Precision Ground | 0000000 | 0000 |
3/32" | -0.0002" to 0" | 2 1/4" | Precision Ground | 0000000 | 0000 |
7/64" | -0.0002" to 0" | 2 3/4" | Precision Ground | 0000000 | 0000 |
1/8" | -0.0002" to 0" | 2 3/4" | Precision Ground | 0000000 | 0000 |
9/64" | -0.0002" to 0" | 3" | Precision Ground | 0000000 | 0000 |
5/32" | -0.0002" to 0" | 3 1/4" | Precision Ground | 0000000 | 0000 |
11/64" | -0.0002" to 0" | 3 1/4" | Precision Ground | 0000000 | 0000 |
3/16" | -0.0002" to 0" | 3 1/2" | Precision Ground | 0000000 | 0000 |
13/64" | -0.0002" to 0" | 3 5/8" | Precision Ground | 0000000 | 0000 |
7/32" | -0.0002" to 0" | 3 3/4" | Precision Ground | 0000000 | 00000 |
15/64" | -0.0002" to 0" | 3 7/8" | Precision Ground | 0000000 | 00000 |
1/4" | -0.0002" to 0" | 4" | Precision Ground | 0000000 | 00000 |
17/64" | -0.0002" to 0" | 4 1/8" | Precision Ground | 0000000 | 00000 |
9/32" | -0.0002" to 0" | 4 1/4" | Precision Ground | 0000000 | 00000 |
19/64" | -0.0002" to 0" | 4 3/8" | Precision Ground | 0000000 | 00000 |
5/16" | -0.0002" to 0" | 4 1/2" | Precision Ground | 0000000 | 00000 |
21/64" | -0.0002" to 0" | 4 5/8" | Precision Ground | 0000000 | 00000 |
11/32" | -0.0002" to 0" | 4 3/4" | Precision Ground | 0000000 | 00000 |
23/64" | -0.0002" to 0" | 4 7/8" | Precision Ground | 0000000 | 00000 |
3/8" | -0.0002" to 0" | 5" | Precision Ground | 0000000 | 00000 |
25/64" | -0.0002" to 0" | 5 1/8" | Precision Ground | 0000000 | 00000 |
13/32" | -0.0002" to 0" | 5 1/4" | Precision Ground | 0000000 | 00000 |
27/64" | -0.0002" to 0" | 5 3/8" | Precision Ground | 0000000 | 00000 |
7/16" | -0.0002" to 0" | 5 1/2" | Precision Ground | 0000000 | 00000 |
29/64" | -0.0002" to 0" | 5 5/8" | Precision Ground | 0000000 | 00000 |
15/32" | -0.0002" to 0" | 5 3/4" | Precision Ground | 0000000 | 00000 |
31/64" | -0.0002" to 0" | 5 7/8" | Precision Ground | 0000000 | 00000 |
1/2" | -0.0002" to 0" | 6" | Precision Ground | 0000000 | 00000 |
Grind-Your-Own Lathe Tool Blanks
Grind these hardened steel blanks to the size and shape you need.
M42 high-speed steel has excellent heat resistance for use on stainless steel and nickel.
Square Shank

Shank | M42 High-Speed Steel | |||||
---|---|---|---|---|---|---|
Wd. | Ht. | Overall Lg. | End Shape | Bevel Angle | Each | |
1/8" | 1/8" | 2 1/2" | Beveled | 10° | 0000000 | 000000 |
3/16" | 3/16" | 2 1/2" | Beveled | 10° | 000000 | 00000 |
1/4" | 1/4" | 2 1/2" | Beveled | 10° | 000000 | 00000 |
5/16" | 5/16" | 2 1/2" | Beveled | 10° | 000000 | 00000 |
3/8" | 3/8" | 3" | Beveled | 10° | 000000 | 00000 |
7/16" | 7/16" | 3 1/2" | Beveled | 10° | 000000 | 00000 |
1/2" | 1/2" | 4" | Beveled | 10° | 000000 | 00000 |
5/8" | 5/8" | 4 1/2" | Beveled | 10° | 000000 | 00000 |
3/4" | 3/4" | 5" | Beveled | 10° | 000000 | 00000 |
7/8" | 7/8" | 6" | Beveled | 10° | 000000 | 000000 |
1" | 1" | 7" | Beveled | 10° | 0000000 | 000000 |