Scope
SAE J429 covers the mechanical and material requirements for inch series fasteners used in automotive and related industries in sizes to 1-1/2” inclusive.
Below is a basic summary the most common grades. SAE J429 covers a number of other grades and grade variations not covered in this summary, including 4, 5.1, 5.2, 8.1, and 8.2.
J429 Mechanical Properties
Grade | Nominal Size, inches | Full Size Proofload, | Yield Strength, min, | 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 |
1/4 thru 3/4 | 55,000 | 57,000 | 74,000 | 18 | 35 | B80 to B100 | N/A | |
2 | Over 3/4 thru 1-1/2 | 33,000 | 36,000 | 60,000 | 18 | 35 | B70 to B100 | |
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 | ||
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
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 1½”. |