J429 Grade 8.1 - SAE J429-2011

Grade	J429 Grade 8.1
Corresponding Standard	SAE J429-2011 Mechanical and Material Requirements for Externally Threaded Fasteners
Classification	Alloy Steel

J429 Grade 8.1 Chemical Element Composition Content (%)

Component	C	Mn ^①	P	S	Cr ^①	Ni ^①	Mo ^①	V ^①
Minimum Value	0.28	1.65	-	-	0.3	0.3	0.2	0.1
Maximum Value	0.55	-	0.025	0.04	-	-	-	-

J429 Grade 8.1 Mechanical Properties

	Tensile Strength σ_b ksi	Yield Point σ_s ksi	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
Full-Size Specimen	≥150
Machined Specimen	≥150	≥130	≥10	≥35	（HRC） ≤58.6

Note: Full Size means a tension test specimen consisting of a completed fastener for testing in the ready to use condition without alteration

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