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SAE J429 Grade 5 / Grade 8 Fasteners
Patriot Bolt machines SAE J429 Grade 5 and Grade 8 fasteners for machinery, equipment and vehicles. Grade 5 is quenched and tempered medium-carbon steel. Grade 8 is quenched and tempered medium-carbon alloy steel.
This page brings together the J429 fasteners we make, the property limits by grade, and how J429 compares with ASTM carbon and alloy steel grades.
[ Quick Specs ]
SAE J429 Grade 5 / Grade 8 at a Glance
- Specification
- SAE J429 Grade 5 or Grade 8
- Grade 5
- 120 ksi tensile, 92 ksi yield (1 in and under)
- Grade 8
- 150 ksi tensile, 130 ksi yield
- Size range
- To 1-1/2 in
- Matching nut
- SAE J995 of the same grade
- Products
- Hex cap screws, heavy hex bolts, nuts
SAE J429 Grade 5 / Grade 8 Fasteners We Machine
Choose a product to see its standards and options. Every order ships with mill test reports traceable to the heat.
SAE J995 Grade 5 / 8 NutsMatching nut
Grade 5 / 8 Hex Cap ScrewsMade in Grade 5 / 8SAE J429 Grade 5 / Grade 8 Mechanical Properties
| Grade and diameter | Proof load | Yield, min | Tensile, min | Hardness |
|---|---|---|---|---|
| 5, 1/4–1 in | 85 ksi | 92 ksi | 120 ksi | C25–C34 |
| 5, over 1 to 1-1/2 in | 74 ksi | 81 ksi | 105 ksi | C19–C30 |
| 8, 1/4–1-1/2 in | 120 ksi | 130 ksi | 150 ksi | C33–C39 |
Above 1-1/2 in, ASTM A449 is the usual Grade 5 equivalent and A354 BD the Grade 8 equivalent.
J429 vs. Other Carbon and Alloy Steel Grades
| Grade | Strength, min (tensile / yield) | Typical use |
|---|---|---|
| SAE J429 Grade 5 | 120 / 92 ksi to 1 in | Machinery cap screws and bolts to 1-1/2 in |
| SAE J429 Grade 8 | 150 / 130 ksi | High-strength cap screws and bolts to 1-1/2 in |
| A449 | 120 / 92 ksi to 1 in | General engineering; Grade 5 strength to 3 in |
| A354 BD | 150 / 130 ksi to 2-1/2 in | High-strength studs, rods and bolts to 4 in |
Compare all grades in the Fastener Materials Matrix.
SAE J429 Grade 5 / Grade 8 Fastener FAQ
What is the difference between Grade 5 and Grade 8?
Grade 8 is alloy steel with 150 ksi minimum tensile. Grade 5 is medium-carbon steel with 120 ksi through 1 in.
Which J429 fasteners does Patriot Bolt make?
We machine Grade 5 and Grade 8 hex cap screws, heavy hex bolts and matching J995 nuts.
What if I need Grade 8 strength above 1-1/2 in?
SAE J429 stops at 1-1/2 in. Specify ASTM A354 BD for Grade 8 strength, or A449 for Grade 5 strength, in larger sizes.
Do Grade 5 and Grade 8 fasteners come with certifications?
Yes. Patriot Bolt is ISO 9001:2015 certified, and every Grade 5 and Grade 8 order includes mill test reports traceable to the heat and a certificate of conformance to your purchase order.
Request a Quote
Send us the product, size, specification and quantity, or upload your drawing. Call (281) 581-0176 or request a quote.