A
Anonymous
Mar 12, 2026
Rating: 4/5
Good but check sizing
Quality is high, but ensure you measure your bore size. M12 fit perfectly in our project.
Description
Grade 14.9 High-Strength Socket Cap Bolts Alloy Steel Black Extended Screws M6 M8 M10 M12 M14 M16
Reviews
Attributes
| Brand | - |
| Category | Industrial Small Parts / Connectors and Fasteners |
| Origin | - |
| Material | Alloy Steel 40Cr |
| Strength Grade | 14.9 |
| Surface Finish | Black Oxide Coating |
| Thread Standard | ISO Metric Coarse |
| Head Style | Hex Socket Cap |
| Drive Type | Internal Hex |
| Size Range | M6, M8, M10, M12, M14, M16 |
| Hardness | HRC 45-50 |
| Packaging | Bulk Box (100-500 pcs) |
| Certification | ISO 9001 Manufactured |
5 reviews
A
Anonymous
Mar 04, 2026
Rating: 5/5
Reliable supply
We order these monthly for our fabrication shop. Consistency is key and these deliver.
A
Anonymous
Feb 27, 2026
Rating: 5/5
Stronger than expected
Overkill for my home garage but peace of mind is worth it. Black finish looks nice too.
A
Anonymous
Feb 23, 2026
Rating: 5/5
Solid industrial quality
Used these for assembling a custom rig. The tensile strength is noticeable compared to standard bolts.
A
Anonymous
Jan 27, 2026
Rating: 5/5
Great for high torque apps
No stripping on the hex socket even under high tension. Very satisfied with the bulk pricing.
5 FAQ
Q: Can I order mixed sizes in one box?
A: These are sold per size variant. Please add separate items for different diameters.
Q: Are these compatible with stainless nuts?
A: Yes, but ensure galvanic corrosion is managed if used in wet conditions.
Q: What hex key size is needed for M10?
A: An 8mm hex key is typically required for the M10 socket cap screws.
Q: Is there a certificate of conformity included?
A: Yes, bulk orders ship with a material test report upon request.
Q: What is the corrosion resistance rating?
A: Black oxide provides mild resistance. We recommend oiling for outdoor environments.
![[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)
