ASTM A193 Grade B7 Steel

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System of Measurement

Diameter

Shape

Length

Heat Treatment

Hardness

Hardness Rating

Specifications Met

ANSI/MSS SP-58 Type 23

Federal Specification

ISO Standard

OSHA Compliant 29 CFR 1926.701

SAE Standard

Material

4140 Alloy Steel

Yield Strength

40,000 psi to 99,999 psi

100,000 psi to 199,999 psi

Tolerance Rating

Undersized

Certificate Type

Material Certificate with Traceable Lot Number

Appearance

Plain

Fabrication

Cold Worked

DFARS Specialty Metals

Maximum Temperature

REACH

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Elongation

RoHS

Minimum Temperature

Export Control Classification Number (ECCN)

EAR99

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41 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.

High-Temperature Hardened Multipurpose 4140 Alloy Steel Rods and Discs

For use in high heat, these rods and discs keep their strength in temperatures up to 800° F. They’re hardened for increased abrasion and impact resistance. Plus, they’re stress relieved, so there’s less chance of warping during machining. Also known as chrome-moly steel, 4140 alloy steel is used for a wide range of parts, such as gears, axles, shafts, collets, and die holders. It resists fracturing from repeated stress. All have been manufactured to meet ASTM standards for quality and performance.

Note: Rods and discs may be made from either 4140 or 4142 alloy steel. They are interchangeable in most applications.

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: Rockwell C32 (Hard), Rockwell C35 (Hard)
Fabrication: Cold Worked
Specifications Met: See table

Dia.	Dia. Tolerance	Yield Strength, psi	Heat Treatment	Max. Temp., °F	Specifications Met	Straightness Tolerance		1/2 ft. Lg.	1 ft. Lg.	2 ft. Lg.	3 ft. Lg.	4 ft. Lg.	6 ft. Lg.	8 ft. Lg.	12 ft. Lg.
3/8"	-0.005" to 0.005"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K336	00000	00000	00000	000000	000000	000000	000000	000000
1/2"	-0.005" to 0.005"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K356	0000	0000	00000	00000	00000	00000	00000	00000
5/8"	-0.005" to 0.005"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K29	0000	00000	00000	00000	00000	00000	00000	00
3/4"	-0.005" to 0.005"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K32	0000	00000	00000	00000	00000	00000	00000	00000
7/8"	-0.005" to 0.005"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K34	00000	00000	00000	00000	00000	00000	00000	00
1"	-0.005" to 0.005"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K36	00000	00000	00000	00000	00000	00000	000000	000000
1 1/16"	-0.006" to 0.006"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8648N69	00	00000	00	00000	00	000000	00	00
1 1/8"	-0.006" to 0.006"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K38	00000	00000	00000	00000	00000	000000	000000	00
1 3/16"	-0.006" to 0"	105,000	Hardened, Stress Relieved	800°	ASTM A108, ASTM A193 Grade B7	3/16" per 10 ft.	8935K317	00	00000	00	00000	00	000000	00	00
1 1/4"	-0.006" to 0.006"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K42	00000	00000	00000	00000	00000	000000	000000	00
1 5/16"	-0.006" to 0"	105,000	Hardened, Stress Relieved	800°	ASTM A108, ASTM A193 Grade B7	3/16" per 10 ft.	8935K318	00	00000	00	00000	00	000000	00	00
1 3/8"	-0.006" to 0.006"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K44	00000	00000	00000	00000	000000	000000	000000	00
1 1/2"	-0.006" to 0.006"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K11	00000	00000	00000	00000	000000	000000	000000	000000
1 5/8"	-0.007" to 0.007"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K12	00000	00000	00000	000000	000000	000000	000000	00
1 3/4"	-0.007" to 0.007"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K13	00000	00000	00000	000000	000000	000000	000000	00
1 7/8"	-0.007" to 0.007"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K14	00000	00000	000000	000000	00	000000	00	00
2"	-0.007" to 0.007"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K15	00000	00000	000000	000000	000000	000000	000000	00
2 1/8"	-0.007" to 0.007"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K16	00000	00000	000000	000000	00	000000	00	00
2 1/4"	-0.007" to 0.007"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K17	00000	00000	000000	000000	00	000000	00	00
2 3/8"	-0.007" to 0.007"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K18	00000	00000	000000	000000	00	000000	00	00
2 1/2"	-0.007" to 0.007"	105,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K19	00000	00000	000000	000000	000000	000000	000000	00
2 5/8"	-0.008" to 0.008"	95,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K21	00000	000000	000000	000000	00	000000	00	00
2 3/4"	-0.008" to 0.008"	95,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K22	00000	000000	000000	000000	00	000000	00	00
3"	-0.008" to 0.008"	95,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K24	00000	000000	000000	000000	00	000000	00	00
3 1/4"	-0.008" to 0.008"	95,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K26	00000	000000	000000	000000	00	000000	00	00
3 1/2"	-0.008" to 0.008"	95,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K28	000000	000000	000000	000000	00	000000	00	00
3 3/4"	-0.008" to 0.008"	95,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K91	000000	000000	000000	000000	00	000000	00	00
4"	-0.008" to 0.008"	95,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8935K92	000000	000000	000000	000000	00	00000000	00	00
4 1/4"	-0.009" to 0.009"	75,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8648N61	00	000000	00	00	00	00	00	00
4 1/2"	-0.009" to 0.009"	75,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8648N62	00	000000	00	00	00	00	00	00
5"	-0.009" to 0.009"	75,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8648N63	00	000000	00	00	00	00	00	00
5 1/2"	-0.009" to 0.009"	75,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8648N64	00	000000	00	00	00	00	00	00
6"	-0.009" to 0.009"	75,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8648N65	00	000000	00	00	00	00	00	00
6 1/2"	-0.01" to 0.01"	75,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8648N66	00	000000	00	00	00	00	00	00
7"	-0.01" to 0.01"	75,000	Hardened, Stress Relieved	800°	ASTM A193 Grade B7, ASTM A434 Class BC	3/16" per 10 ft.	8648N67	00	000000	00	00	00	00	00	00

Discs

Yield Strength: 95,000 psi
Hardness: Rockwell C32 (Hard)
Fabrication: Cold Worked
Specifications Met: ASTM A108, ASTM A193 Grade B7

1/2" Lg.
Dia.	Dia. Tolerance	Heat Treatment	Max. Temp., °F	Straightness Tolerance		Each
3"	-0.008" to 0.008"	Hardened, Stress Relieved	800°	3/16" per 10 ft.	8648N11	000000
4"	-0.008" to 0.008"	Hardened, Stress Relieved	800°	3/16" per 10 ft.	8648N14	00000
1" Lg.
3"	-0.008" to 0.008"	Hardened, Stress Relieved	800°	3/16" per 10 ft.	8648N12	00000
4"	-0.008" to 0.008"	Hardened, Stress Relieved	800°	3/16" per 10 ft.	8648N15	00000
3" Lg.
3"	-0.008" to 0.008"	Hardened, Stress Relieved	800°	3/16" per 10 ft.	8648N13	00000
4"	-0.008" to 0.008"	Hardened, Stress Relieved	800°	3/16" per 10 ft.	8648N16	00000