STS Industrial - Bolts & Screws

 

SAE J429 GRADE 5 HEX HEAD CAP SCREWS

GOVERNING STANDARDS:
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.

 

APPLICATIONS:

Common / economical medium strength fastener. Has greater tensile strength than Grade 2 / A307. Yield-to-tensile ratio is the lowest of all heat treated steel fasteners. Most common grade used in manufacturing.

SAE J429 Grade 5 Hex Head Bolt and Cap Screw Head Marking

Product to be marked with the manufacturers head marking as indicated by the X.

MATERIAL PROPERTIES:
Medium Carbon Steel, Heat Treated, Quenched and Tempered

DIAMETER

PROOF LOAD

YIELD STRENGTH

TENSILE STRENGTH

CORE HARDNESS

1/4″ through 1″ 85,000 psi 92,000 psi 120,000 psi C25 to C34
1-1/8″ through 1-1/2″ 74,000 psi 81,000 psi 105,000 psi C19 to C30
Elongation 14% 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 A449 Type 1.
DIMENSIONAL SPECIFICATIONS:

SAE J429 Grade 5 Hex Head Cap Screws Dimensions

Usable thread length for Grade 5 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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