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Grade A574 Grade 4142
USA UNS G41420
Corresponding Standard ASTM A574-2017
Alloy Steel Socket-Head Cap Screws
Classification Alloy Steel
A574 Grade 4142 Chemical Element Composition Content (%)
  Component C Si Mn P S Cr Mo
Heat Analysis Minimum Value 0.4 0.15 0.75 - - 0.8 0.15
Maximum Value 0.45 0.35 1 0.035 0.04 1.1 0.25
  Component C Si Mn P S Cr Mo
Product Analysis Minimum Value 0.38 0.13 0.71 - - 0.75 0.13
Maximum Value 0.47 0.37 1.04 0.04 0.045 1.15 0.27
A574 Grade 4142 Mechanical Properties
Normal diameter
d
in.		 Tensile Strength
σb
ksi 		Specified Plastic Yield Strength
Rp0.2
ksi 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
d ≤ 0.5 (Full size) ≥180 HRC
39~44
0.5 < d < 1.0 (Full size) ≥170 37~44
d ≥ 1.0 (Full size) ≥170 37~44
d≥1.0（mechined test specimen） ≥170 ≥153 ≥10 ≥35
1 Approximate Comparison Table Structural Alloy Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Sweden United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade SS14 BS EN/BS
42CrMo A30422 SCM440 SCM440
SCM440H 		SCM440 4140
4142 		G41400
G41420 		42CrMo4 42CrMo4 1.7225 42CD4 42CrMo4 1.7225 2244 708M40
2 Approximate Comparison Table Structural Alloy Steel
China Japan South Korea United States International Organization for Standardization Germany Russia United Kingdom
GB ISC JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. GOST BS EN/BS
40CrMnMo A34402 SCM440 SCM440 4142
4140 		G41420 42CrMo4 42CrMo4 1.7225 40ХГМ 708A42

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