SAE J429 Grades

J429 Mechanical Properties
Grade Nominal Size, inches Full Size Proofload, psi Yield Strength, min, psi Tensile Strength, min, psi Elong, min, % RA, min, % Core Hardness, Rockwell Tempering Temperature, min
1 1/4 thru 1-1/2 33,000 36,000 60,000 18 35 B7 to B100 N/A
2 1/4 thru 3/4 55,000 57,000 74,000 18 35 B80 to B100 N/A
Over 3/4 thru 1-1/2 33,000 36,000 60,000 18 35 B70 to B100 N/A
5 1/4 thru 1 85,000 92,000 120,000 14 35 C25 to C34 800F
Over 1 thru 1-1/2 74,000 81,000 105,000 14 35 C19 to C30 800F
8 1/4 thru 1-1/2 120,000 130,000 150,000 12 35 C33 to C39 800F

Grade 2 requirements for sizes 1/4" thru 3/4" apply only to bolts 6" and shorter, and to studs of all lengths. For bolts longer than 6", Grade 1 requirements shall apply.


J429 Chemical Requirements
Grade Material Carbon, % Phosphorus, % Sulfur, % Grade Marking
1 Low or Medium Carbon Steel 0.55 max 0.030 max 0.050 max None
2 Low or Medium Carbon Steel 0.15 - 0.55 0.030 max 0.050 max None
5 Medium Carbon Steel 0.28 - 0.55 0.030 max 0.050 max
8 Medium Carbon Alloy Steel 0.28 - 0.55 0.030 max 0.050 max

J429 Recommended Hardware
Nuts Washers
J995 N/A

Alternate Grades

For fasteners larger than 1-1/2” in diameter, the following ASTM grades should be considered.

SAE J429 Grade ASTM Equivalent
Grade 1 A307 Grades A or B
Grade 2 A307 Grades A or B
Grade 5 A449
Grade 8 A354 Grade BD

This chart compares SAE and ASTM specifications that are similar but not identical in diameters through 1-1/2".


All information derived from globally recognized specifications, subject to change, user discretion is advised.