Attributes

Brand	-
Category	Industrial Small Parts / Connectors and Fasteners
Origin	-
Material	Alloy Steel
Strength Grade	12.9
Surface Finish	Black Oxide
Head Type	Socket Head Cap
Drive Style	Internal Hex
Thread Type	Metric Coarse
Size Range	M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M14, M16, M20
Tensile Strength	1220 MPa (Minimum)
Hardness	39-44 HRC
Compliance Standard	DIN 912 / ISO 4762

5 reviews

Anonymous

Mar 30, 2026

Rating: 5/5

Top Quality Bolts

These screws held up perfectly under high tension in my machinery assembly. The black oxide finish looks professional and the threads are cut very cleanly.

Anonymous

Mar 01, 2026

Rating: 5/5

Perfect for CNC

Used for mounting components on my CNC router. The head height is consistent and they sit flush in the counterbores.

Anonymous

Feb 28, 2026

Rating: 4/5

Great Strength

Very strong fasteners as expected from Grade 12.9. Only giving 4 stars because the packaging was slightly damaged during shipping, but the bolts were fine.

Anonymous

Jan 30, 2026

Rating: 5/5

Reliable Supply

Consistent quality across different sizes. I ordered a mix of M4 and M8 and both batches met the specifications.

Anonymous

Jan 29, 2026

Rating: 5/5

Precise Threading

No issues with stripping during installation. I used the M6 size for a custom jig and they tightened smoothly without binding.

5 FAQ

Q: Do you offer M24 sizes in this grade?

A: Currently, this listing supports sizes from M2 to M20. Please contact us directly for inquiries regarding larger diameters.

Q: What hex key size is required for the M6 bolts?

A: For M6 Socket Head Cap Screws, a 5mm hex key is typically required according to DIN 912 standards.

Q: Are these suitable for outdoor applications?

A: The black oxide finish provides mild corrosion resistance. For harsh outdoor environments, we recommend applying additional coating or grease.

Q: What is the approximate yield strength for these screws?

A: For Grade 12.9 alloy steel, the yield strength is typically around 1100 MPa. Please refer to the technical datasheet for specific size variations.

Q: Is a material certificate available with purchase?

A: Yes, mill certificates are available upon request for bulk orders. Please message us after placing your order.

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