SAE J429 Specification
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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.
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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 |
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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 |
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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. |
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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 |
|
Grade 8 |
A354 Grade BD |
This chart compares SAE and ASTM specifications that are similar but not identical in diameters through 1½". |
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