Rockwell B104 Steel | McMaster-Carr

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Rockwell C48 to Rockwell C51

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40,000 psi to 99,999 psi

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Maximum Hardness After Heat Treatment

Rockwell C62

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Hot Rolled

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22.5%

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11 Products

About Steel

Compare over 50 grades of steel and cast iron to find the right material for you—all with material certificates for traceability.

Tight-Tolerance Multipurpose Air-Hardening A2 Tool Steel Rods

Precision ground and held to a strict straightness tolerance, these rods are ready for turning in your lathe. Also known as drill rod, this A2 tool steel is more wear resistant than O1 and keeps a sharper cutting edge. It’s air-hardening, so it doesn’t require baths or quenching after heat treatment. This tool steel is often used for punches, blades, and hammers. These rods have been manufactured to ASTM A681 standards for performance and quality.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Rods

Yield Strength: See Table
Hardness: See Table
Heat Treatable: Yes
Max. Hardness After Heat Treatment: Rockwell C62
Fabrication: Hot Rolled
Specifications Met: ASTM A681

Dia.	Dia. Tolerance	Yield Strength	Heat Treatment	Hardness	Mechanical Finish	Straightness Tolerance		1 ft. Lg.	3 ft. Lg.	4 ft. Lg.	6 ft. Lg.	8 ft. Lg.
1/8"	-0.0005" to 0.0005"	55,000 psi	Annealed (Softened)	Rockwell B104	Precision Ground	0.005" per ft.	00000000	00000	00000	00	000000	000000
9/64"	-0.0005" to 0.0005"	55,000 psi	Annealed (Softened)	Rockwell B104	Precision Ground	0.005" per ft.	00000000	0000	0000	00	00000	00
5/32"	-0.0005" to 0.0005"	55,000 psi	Annealed (Softened)	Rockwell B104	Precision Ground	0.005" per ft.	00000000	0000	0000	00	00000	00000
11/64"	-0.0005" to 0.0005"	55,000 psi	Annealed (Softened)	Rockwell B104	Precision Ground	0.005" per ft.	00000000	0000	0000	00	00000	00
3/16"	-0.0005" to 0.0005"	55,000 psi	Annealed (Softened)	Rockwell B104	Precision Ground	0.005" per ft.	00000000	0000	0000	000000	00000	00000
13/64"	-0.0005" to 0.0005"	55,000 psi	Annealed (Softened)	Rockwell B104	Precision Ground	0.005" per ft.	00000000	0000	00000	00	00000	00
7/32"	-0.0005" to 0.0005"	55,000 psi	Annealed (Softened)	Rockwell B104	Precision Ground	0.005" per ft.	00000000	0000	00000	00	00000	00
15/64"	-0.0005" to 0.0005"	55,000 psi	Annealed (Softened)	Rockwell B104	Precision Ground	0.005" per ft.	00000000	0000	00000	00	00000	00

Metric Rods

Yield Strength: 55,000 psi
Hardness: See table
Heat Treatable: Yes
Max. Hardness After Heat Treatment: Rockwell C62
Fabrication: Hot Rolled
Specifications Met: ASTM A681

Dia., mm	Dia. Tolerance, mm	Heat Treatment	Hardness	Mechanical Finish	Straightness Tolerance		1 ft. Lg.	2 ft. Lg.	3 ft. Lg.	6 ft. Lg.
4	-0.0127 to 0.0127	Annealed (Softened)	Rockwell B104	Precision Ground	0.0125" per ft.	0000000	00000	00	000000	000000
5	-0.0127 to 0.0127	Annealed (Softened)	Rockwell B104	Precision Ground	0.0125" per ft.	0000000	0000	00	00000	00000
6	-0.0127 to 0.0127	Annealed (Softened)	Rockwell B104	Precision Ground	0.0125" per ft.	0000000	0000	000000	00000	00000