Attributes

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

5 reviews

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.

5 FAQ

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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