Grade 5 Hex Cap Screws
The everyday high-strength bolt: quenched and tempered medium-carbon steel at 120 ksi to 1 in., stepping down for larger sizes — Grade 5 in SAE terms, A449 in ASTM terms.
Fully threaded hex heads with a robust design for industrial applications. Manufactured to ASME B18.2.1 with washer-face bearing surface, in all stocked grades.
SAE J429 Grade 5 and ASTM A449 Type 1 describe the same product: a medium-carbon steel hex cap screw, bolt or stud, quenched and tempered to 120 ksi tensile in sizes to 1 in., 105 ksi over 1 to 1½ in., and 90 ksi over 1½ to 3 in. A449 is the ASTM version that carries the larger sizes and the chemistry and testing rules; Grade 5 is the automotive and machinery designation marked with three radial lines on the head.
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What Grade 5 must meet.
| Grade / condition and size | Tensile strength, min (ksi) | Yield or proof, min (ksi) | Elongation, min (%) | Reduction of area, min (%) | Hardness |
|---|---|---|---|---|---|
| ¼ to 1 in. | 120 | 92 | 14 | 35 | 25–34 HRC |
| Over 1 to 1½ in. | 105 | 81 | 14 | 35 | 19–30 HRC |
| Over 1½ to 3 in. | 90 | 58 | 14 | 35 | 183–235 HBW |
Values per ASTM A449-14 (2020) Tables 3 and 6 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team. Full-size tensile and proof loads by thread size are in Tables 4 and 5 of the specification.
Quenched in liquid from above the transformation temperature and tempered at 800 °F minimum. Threads may be rolled, cut or ground.
Full Grade 5 / A449 data sheet: chemistry, physical properties and standards →
Made to standard or to your drawing.
- Machinery, equipment and vehicle bolting
- Pipe supports and equipment anchoring
- General high-strength fasteners where A325 dimensions are not required
- Studs and threaded rod in 120 ksi