SAE J429 GRADE 8 HEX HEAD CAP SCREWS
|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.|
Common/economical high strength fastener. Has greater tensile strength than Grade 5. Designed for use in high stress applications.
Product to be marked with the manufacturers head marking as indicated by the X.
|Medium Carbon Alloy Steel, Heat Treated, Quenched and Tempered
Note: For diameters 1/4″ through 7/16″, it is permissible to use AISI 1541 steel.
|1/4″ through 1-1/2″||120,000 psi||130,000 psi||150,000 psi||C33 to C39|
|Elongation||12% Minimum (All Diameters)|
|Reduction of Area||35% Minimum (All Diameters)|
|Material strengths listed are minimum acceptable per governing standard. Core hardness based on Rockwell scale. For diameters larger than 1-1/2 in., see ASTM A354 Grade BD.|
ASTM A354 Grade BD
Usable thread length for Grade 8 Hex Head Cap Screws can be approximated by the equation THREAD LENGTH = (2 X DIAMETER) + 1/4″
Sources: ASTM Standards for Mechanical Fasteners and Related Processes 2nd Edition, Inch Fastener Standards 8th Edition, Kanebridge Fastener Reference Guide 4th Edition
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