A
Anonymous
Apr 21, 2026
Rating: 5/5
Strong and Reliable
Used these for rebuilding my engine. No issues with stripping under high torque.
Description
Grade 12.9 High-Strength Socket Head Cap Screws, Hex Allen Bolts M3-M16 by Gujie
Reviews
Attributes
| Brand | - |
| Category | Industrial Small Parts / Connectors and Fasteners |
| Origin | - |
| Material | Alloy Steel |
| Strength Grade | 12.9 |
| Head Style | Socket Head Cap |
| Drive Type | Internal Hex |
| Thread Size Range | M3, M4, M5, M6, M8, M10, M12, M16 |
| Surface Finish | Black Oxide |
| Manufacturing Standard | DIN 912 / ISO 4762 |
| Tensile Strength | 1220 MPa |
| Hardness | HRC 39-44 |
| Package Type | Plastic Storage Case |
5 reviews
A
Anonymous
Apr 18, 2026
Rating: 5/5
Perfect Fit
Threads are precise and match standard nuts perfectly. Very satisfied with the quality.
A
Anonymous
Mar 26, 2026
Rating: 5/5
Great Value
Much cheaper than local hardware store for the same 12.9 grade specification.
A
Anonymous
Mar 23, 2026
Rating: 5/5
Professional Grade
Exactly what is needed for high tension applications in machinery. Highly recommend.
A
Anonymous
Mar 04, 2026
Rating: 4/5
Good Quality
Great bolts, but delivery took a bit longer than expected. Product itself is excellent.
5 FAQ
Q: Is there a warranty?
A: We offer a 30-day return policy for unused items in original packaging.
Q: Can I use these on aluminum?
A: Yes, but ensure proper torque to avoid stripping the softer aluminum threads.
Q: Do you sell matching nuts?
A: Yes, please check our store for compatible 12.9 grade hex nuts.
Q: What hex key size for M6?
A: Typically requires a 5mm hex key for M6 size according to standard specifications.
Q: Are these rust resistant?
A: They have black oxide coating but are not stainless steel. Use oil for outdoor protection.
![[M2-M20] Stainless Steel Spring Washer](https://www.gosteppe.com/cache/medium/product/16306/legacy-main-ef3d2dba3bde669d48e6cca2.webp)
![[Damai Patented Microneedle Hair Transplant] Hairline + Eyebrow Planting | 1000 Grafts Hairline + Both Eyebrows](https://www.gosteppe.com/cache/small/product/270086/legacy-main-ef9cf7c7623c5273ad865d7a.webp)
