Grade 300M Alloy Steel | McMaster-Carr

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Fatigue-Resistant High-Strength
300M Alloy Steel Rods

Yield Strength: 100,000 psi
Hardness: Rockwell C25 (Hard)
Heat Treatable: Yes
Max. Hardness After Heat Treatment: Rockwell C54
Specifications Met: ASTM A579

A modified version of 4340 alloy steel, 300M is used in applications that require high yield strength, such as torsion bars and drive shafts. This material has been normalized for consistent hardening and machining.

Dia.	Dia. Tolerance	Heat Treatment		1/2 ft. Lg.	1 ft. Lg.	3 ft. Lg.
1/2"	-0.002" to 0.002"	Normalized	0000000	000000	000000	0000000
3/4"	0" to 0.016"	Normalized	0000000	00000	00000	000000
7/8"	0" to 0.016"	Normalized	0000000	00000	00000	000000
1"	0" to 0.016"	Normalized	0000000	00000	00000	000000
1 1/2"	0" to 0.016"	Normalized	0000000	00000	00000	000000
2"	0" to 0.016"	Normalized	0000000	000000	000000	000000

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The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)