4140 - ASTM A866-2014

Grade	4140
Corresponding Standard	ASTM A866-2014 Medium Carbon Anti-Friction Bearing Steel
Classification	Bearing Steel

4140 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Cu	Mo	Al	O
Minimum Value	0.38	0.15	0.75	-	-	0.8	-	0.15	-	-
Maximum Value	0.43	0.35	1	0.025	0.025	1.1	0.3	0.25	0.05	0.002

Note1: Elements not quoted shall not be intentionally added to the steel without the agreement of the purchaser
Note2: Intentional additions of calcium or calcium alloys for deoxidation or inclusion shape control are not permitted unless specifically approved by the purchaser
Note3: Oxygen content applies to product analysis and shall be determined in accordance with Test Methods E1019.

1 Approximate Comparison Table Alloy Steel for Quenching and Tempering

United States	International Organization for Standardization	Germany	France	European Standard
ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade
4140	42CrMoS4	42CrMoS4	42CD4u	42CrMoS4	1.7227

2 Approximate Comparison Table Structural Alloy Steel

China	Japan	United States	International Organization for Standardization	Germany	France	European Standard		Russia	Sweden	United Kingdom
GB	JIS	ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
42CrMo	SCM440H	4140 4142	42CrMo4	42CrMo4	42CD4	42CrMo4	1.7225	35KHM 38KHM	2244	708M40 CFS11

3 Approximate Comparison Table Structural Alloy Steel

Japan	United States
JIS	ASTM	AISI
SNB7	A193 B7	4140 4142 4145

4 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion

China	Japan	United States	International Organization for Standardization	European Standard
GB	JIS	ASTM	ISO	EN
ML40CrMo	SCM440	4140	42CrMo4	42CrMo4

5 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion

China		Japan	United States	International Organization for Standardization	European Standard
YB	GB	JIS	ASTM	ISO	EN
QML40CrMo	ML40CrMo	SCM440	4140	42CrMo4	42CrMo4

4140 Corresponding Standards(Same grade name, different standards)

1	ANSI
	4140 AISI 4140 G41400
2	ASTM A29/A29M-2012
	4140 G41400
3	ASTM A 320-2000
	4140 L7M L70 L7
4	ASTM A29/A29M-2005
	4140 G41400
5	SAE J404-2000
	4140 G41400
6	ASTM A29/A29M-2020
	4140 G41400
7	ASTM A866-2014
	4140
8	ASTM A519/A519M-2024
	4140
9	ASTM A646/A646M-2024
	4140 Grade 12
10	ASME SA-29/SA-29M-2023
	4140 G41400
11	ASTM A513/A513M-2025
	4140
12	ASME SA-513-2023
	4140

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!