A
Anonymous
Apr 19, 2026
Rating: 5/5
Accurate Sizing
Ordered M8 and M10 sizes. Threads are clean and match my taps perfectly. No issues with fitment.
Description
Grade 12.9 High-Strength Hex Socket Head Cap Screw M3 M4 M5 M6 M8 M10 M12 M14 M16 M20 M24 M30 M36
Reviews
Attributes
| Brand | - |
| Category | Industrial Small Parts / Connectors and Fasteners |
| Origin | - |
| Material | Alloy Steel 40Cr |
| Strength Grade | 12.9 |
| Surface Finish | Black Oxide Coated |
| Thread Standard | ISO Metric Coarse |
| Head Style | Socket Head Cap |
| Drive Type | Hexagonal Socket |
| Hardness | 39-44 HRC |
| Tensile Strength | 1220 MPa Minimum |
| Yield Strength | 1100 MPa Minimum |
| Compliance | DIN 912 / ISO 4762 |
5 reviews
A
Anonymous
Apr 07, 2026
Rating: 5/5
Strong and Reliable
Grade 12.9 is no joke. These hold up much better than standard hardware store bolts. Highly recommend for high-stress applications.
A
Anonymous
Mar 24, 2026
Rating: 5/5
Perfect for CNC Machinery
These screws are exactly what I needed for my CNC router assembly. The hardness is consistent and they haven't stripped under high torque.
A
Anonymous
Mar 23, 2026
Rating: 5/5
Fast Shipping
Product arrived well packaged in a sturdy box. No rust or damage. Will order again for future projects.
A
Anonymous
Feb 01, 2026
Rating: 5/5
Great Quality Fasteners
Used these for an automotive repair project. The black oxide finish looks professional and provides decent corrosion resistance.
5 FAQ
Q: Are these suitable for outdoor use?
A: Black oxide offers mild corrosion resistance. For harsh outdoor environments, we recommend applying additional lubrication or coating.
Q: Can I get a material certification?
A: Yes, mill certificates are available upon request for bulk orders. Please contact us before purchasing.
Q: What Allen key size fits the M6 head?
A: For M6 socket head cap screws, a 5mm Allen key is typically required according to DIN 912 standards.
Q: Do you stock imperial sizes?
A: This listing is for metric sizes only. Please check our other listings for UNC or UNF imperial options.
Q: What torque settings should I use for M10 screws?
A: Torque values depend on lubrication and application. Please refer to a standard ISO 898-1 torque chart for Grade 12.9 fasteners.
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