Rockwell C21 Steel | McMaster-Carr

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34 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.

Weldable 4130 Alloy Steel Rods

Made from 4130 alloy steel, also known as chrome-moly steel, these rods have low carbon content for good weldability. They’re often used to make gears and bushings. The surface of these rods is hardened to make them more resistant to wear and impacts. They’re also normalized, which is a heating process that relieves internal stress and helps prevent cracking during machining or additional hardening.

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

Dia.	Dia. Tolerance	Fabrication	Heat Treatment	Yield Strength	Mechanical Finish	Hardness	Specs. Met		1/2 ft. Long	1 ft. Long	2 ft. Long	3 ft. Long	4 ft. Long	6 ft. Long	8 ft. Long	12 ft. Long
3/8"	-0.004" to 0"	Cold Worked	Hardened, Normalized	Not Rated	—	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T39	—	00000	000000	000000	000000	000000	000000	—
1/2"	-0.004" to 0"	Cold Worked	Hardened, Normalized	Not Rated	—	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T21	—	0000	00000	00000	00000	00000	00000	000000
5/8"	-0.004" to 0"	Cold Worked	Hardened, Normalized	Not Rated	—	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T22	—	00000	00000	00000	00000	00000	00000	—
3/4"	-0.004" to 0"	Cold Worked	Hardened, Normalized	Not Rated	—	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T25	—	00000	00000	00000	00000	00000	00000	—
7/8"	-0.004" to 0"	Cold Worked	Hardened, Normalized	Not Rated	—	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T42	000000	00000	00000	00000	—	000000	—	—
1"	-0.004" to 0"	Cold Worked	Hardened, Normalized	Not Rated	—	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T27	00000	00000	00000	00000	00000	000000	000000	—
1 1/8"	-0.004" to 0"	Cold Worked	Hardened, Normalized	Not Rated	Polished, Turned	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T47	00000	00000	00000	00000	—	000000	—	—
1 1/4"	-0.004" to 0"	Cold Worked	Hardened, Normalized	Not Rated	Polished, Turned	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T29	00000	00000	00000	00000	—	000000	—	—
1 3/8"	-0.004" to 0"	Cold Worked	Hardened, Normalized	Not Rated	Polished, Turned	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T51	—	00000	—	000000	—	000000	—	—
1 1/2"	-0.004" to 0"	Cold Worked	Hardened, Normalized	Not Rated	Polished, Turned	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T32	00000	00000	00000	000000	—	000000	—	—
1 5/8"	-0.005" to 0"	Cold Worked	Hardened, Normalized	Not Rated	Polished, Turned	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T52	—	00000	—	000000	—	—	—	—
1 3/4"	-0.005" to 0"	Cold Worked	Hardened, Normalized	Not Rated	Polished, Turned	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T53	—	00000	—	000000	—	000000	—	—
2"	-0.005" to 0"	Cold Worked	Hardened, Normalized	Not Rated	Polished, Turned	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T34	00000	00000	000000	000000	—	000000	—	—
2 1/4"	-0.005" to 0"	Cold Worked	Hardened, Normalized	Not Rated	Polished, Turned	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T54	—	000000	—	000000	—	—	—	—
2 1/2"	-0.005" to 0"	Cold Worked	Hardened, Normalized	Not Rated	Polished, Turned	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T36	00000	000000	—	000000	—	000000	—	—
2 3/4"	-0.006" to 0"	Cold Worked	Hardened, Normalized	Not Rated	Polished, Turned	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T522	—	000000	—	—	—	—	—	—
3"	-0.006" to 0"	Cold Worked	Hardened, Normalized	Not Rated	Polished, Turned	Rockwell C21 (Hard)	ASTM A108, SAE AMS2301, SAE AMS6348	6673T38	00000	000000	—	000000	—	000000	—	—
4"	0" to 0.063"	Hot Rolled	Hardened, Normalized	Not Rated	—	Rockwell C21 (Hard)	ASTM A29, SAE AMS2301, SAE AMS6348	6673T139	000000	000000	—	000000	—	—	—	—
6"	0" to 0.125"	Hot Rolled	Hardened, Normalized	Not Rated	—	Rockwell C21 (Hard)	ASTM A29, SAE AMS2301, SAE AMS6348	6673T141	000000	000000	—	00000000	—	—	—	—

Hardened Weldable 4130 Alloy Steel Sheets

The surface of this 4130 alloy steel is hardened, so it resists impact and abrasion better than standard 4130 alloy steel. Also known as chrome-moly steel, it has a low carbon content for good weldability. 4130 alloy steel is often used for pressure vessels and structural supports.

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

	Lg.	Fabrication	Yield Strength, psi	Hardness	Specs. Met		Each
0.063" Thick (-0.009" to 0.009" Tolerance)



	12"	12"	Cold Worked	80,000	Rockwell C21 (Hard)	ASTM A506, SAE AMS2301	9632N111	000000


	24"	24"	Cold Worked	80,000	Rockwell C21 (Hard)	ASTM A506, SAE AMS2301	9632N115	000000
	36"	36"	Cold Worked	80,000	Rockwell C21 (Hard)	ASTM A506, SAE AMS2301	9632N119	000000


	0.1" Thick (-0.009" to 0.009" Tolerance)



			12"	12"	Cold Worked	80,000	Rockwell C21 (Hard)	ASTM A506, SAE AMS2301	9632N112	00000


			24"	24"	Cold Worked	80,000	Rockwell C21 (Hard)	ASTM A506, SAE AMS2301	9632N116	000000
			36"	36"	Cold Worked	80,000	Rockwell C21 (Hard)	ASTM A506, SAE AMS2301	9632N121	000000


			1/8" Thick (-0.009" to 0.009" Tolerance)



					12"	12"	Cold Worked	80,000	Rockwell C21 (Hard)	ASTM A506, SAE AMS2301	9632N113	00000


					24"	24"	Cold Worked	80,000	Rockwell C21 (Hard)	ASTM A506, SAE AMS2301	9632N117	000000
					36"	36"	Cold Worked	80,000	Rockwell C21 (Hard)	ASTM A506, SAE AMS2301	9632N122	000000


					1/4" Thick (-0.009" to 0.009" Tolerance)



							12"	12"	Hot Rolled	80,000	Rockwell C21 (Hard)	ASTM A506, SAE AMS2301	9632N114	00000


							24"	24"	Hot Rolled	80,000	Rockwell C21 (Hard)	ASTM A506, SAE AMS2301	9632N118	000000
							36"	36"	Hot Rolled	80,000	Rockwell C21 (Hard)	ASTM A506, SAE AMS2301	9632N123	000000

Rotary Shafts

Pair with gears, sprockets, and bearings to transmit rotary motion. Turned, ground, and polished to tight tolerances, these shafts reduce vibration, evenly distribute loads, and improve accuracy.

Highly Corrosion-Resistant 316 Stainless Steel—More corrosion resistant than 303 and 304 stainless steel shafts. They stand up to salt water and harsh chemicals, such as bleach, chlorine, and phosphoric acid.

				Material
	Lg.	Straightness Tolerance	Diameter Tolerance	Hardness	Hardness Rating		Each
Highly Corrosion-Resistant 316 Stainless Steel







				1/4" Diameter

				18"	0.003"/1 ft.	-0.001" to 0"	Rockwell C21	Hard	6493K17	000000


				36"	0.003"/1 ft.	-0.001" to 0"	Rockwell C21	Hard	6493K18	00000
				60"	0.003"/1 ft.	-0.001" to 0"	Rockwell C21	Hard	6493K19	000000