Description
Reviews
| Brand | - |
| Category | Industrial Small Parts / Connectors and Fasteners |
| Origin | - |
| Material | Alloy Steel |
| Strength Class | Grade 12.9 |
| Thread Size Options | M3, M4, M5, M6, M8, M10, M12 |
| Head Type | Cylindrical Head |
| Surface Treatment | Black Oxide Coating |
| Drive Style | Hex Socket (Allen) |
| Compliance Standard | DIN 912 / ISO 4762 |
| Thread Coverage | Fully Threaded |
| Hardness Range | 39-44 HRC |
| Country of Origin | Imported |
Anonymous
Mar 31, 2026
Rating: 5/5
Great for automotive use
Used on engine components where high tensile strength is required. Held up well under heat and vibration.
Anonymous
Mar 27, 2026
Rating: 4/5
Good but packaging could be better
Bolts are great quality and meet specs, but some were loose in the bag upon arrival. Product itself is fine.
Anonymous
Mar 13, 2026
Rating: 5/5
High quality steel
Very strong bolts. Used them on my bike frame assembly. No issues with stretching or breaking.
Anonymous
Mar 12, 2026
Rating: 5/5
Exact specifications
Measured them with calipers, they are true to metric specs. Will buy again for future projects.
Anonymous
Feb 10, 2026
Rating: 5/5
Perfect for machinery repair
Used these for a CNC machine repair. Fit perfectly and didn't strip under high torque. Very satisfied with the quality.
Q: What key size do I need for the M6 screws?
A: For M6 Grade 12.9 hex socket cap screws, you typically need a 5mm Allen key.
Q: Can I use these on aluminum parts?
A: Yes, but we recommend using an anti-seize compound to prevent galling between the steel and aluminum.
Q: Are these corrosion resistant for outdoor use?
A: They have a black oxide coating which offers mild corrosion resistance. For harsh outdoor environments, we recommend stainless steel.
Q: Do you sell matching nuts for these bolts?
A: Yes, please search for Grade 12.9 hex nuts in our store to find the matching hardware.
Q: What is the minimum tensile strength?
A: Grade 12.9 fasteners have a minimum tensile strength of 1220 MPa.
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