Application
SAE J429 is a spec that in intended for use in the automotive industry and similar industries. There are different types of grades for this spec that covers bolts, anchor bolts and studs – 1, 2, 3, 4, 5, 5.1, 5.2, 8, 8.1 and 8.2 in diameters up to 1-1/2”. Most commonly used and manufactured are Grade 5 and 8. Grade 2 is very similar to A307 and usually offered as A307 instead of Gr. 2.
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 |  |
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 | ||
| 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 |
Nuts
Standard J995Finish Hex Nuts and Standard SAE or USS Washers is recommended.