5/16-18 X 3 1/4 J429 GRADE 8 HEX CAP SCREW, PLATED

Name: 5/16-18 X 3 1/4 J429 GRADE 8 HEX CAP SCREW, PLATED
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Chemical PropertiesGrade 8

Per SAE J429 2014-05
Grade	Material	Carbon	Phosphorus	Sulfur	Boron	Tempering Temperature
Grade	Material	% by weight	% by weight	% by weight	% by weight	Min
8	Carbon (1) Steel with additives (e.g. Boron (2) or Cr, or Mn)	0.25-0.55	0.025 max	0.025 max (5)	0.003	800F
	Medium Carbon Steel	0.25-0.55	0.025 max	0.025 max (5)		800F
	Alloy Steel (3,4)	0.25-0.55	0.025 max (6)	0.025 max (6)		800F

1. For steels of these types there shall be sufficient hardenability to ensure a microsructure consisting of approximately 90% martensite (refer Table 3) in the core of threaded sections of the fasteners after hardening and quenching and before tempering.
2. When boron is added the limits shall be 0.0005 % to 0.003 %.
3. Alloy steel shall contain at least one of the following elements in the minimum quantity given: chromium 0.30 %, nickel 0.30 %, molybdenum 0.20 %, vanadium 0.10 %, manganese 1.65%. Where elements are specified in combinations of two, three, four, or five and have alloy contents less than those given above, the limit value to be applied for steel class determination is 70 % of the sum of the individual limit values shown above for the two, three, four or five elements concerned.
4. For steels of these types there shall be sufficient hardenability to ensure a microsructure consisting of approximately 90% martensite (refer Table 3) in the core of threaded sections of the fasteners after hardening and quenching and before tempering.
5. For studs only, sulfur content may be 0.13% maximum.
6. Alloy steel used to make fasteners by hot forging or machining may have a maximum content by weight of 0.030% P (phosphorus) and 0.040% S (sulfur).

All dimensions are in inches.
Usable thread length for Hex Head Cap Screws under 6 1/4" long can be approximated by the equation THREAD LENGTH = (2 X DIAMETER) + 1/4″

SAE J429	Covers the mechanical and material requirements for inch series fasteners used in automotive and related industries in diameters through 1-1/2″.
ASME B18.2.1	Covers the complete general and dimensional data for multiple types of inch series square and hex bolts and screws.
ASME B1.1 UNC & UNF Class 2A	Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Medium Carbon Steel, Heat Treated, Quenched and Tempered				Per SAE J429 2014-05
Diameter	Full Size Proof Load	Yield Strength	Tensile Strength	Elongation	Reduction in Area	Core Hardness
Diameter	psi	Min psi	Min psi	Min %	Min %	Rockwell
1/4 thru 1 1/2"	120,000	130,000	150,000	12	35	C33 to C39