Attributes

Brand	-
Category	Industrial Small Parts / Connectors and Fasteners
Origin	-
Material	Alloy Steel
Strength Grade	12.9
Head Style	Hex Socket Cap
Drive Type	Internal Hex
Thread Standard	Metric Coarse
Surface Finish	Black Oxide
Compliance Standard	DIN 912 / ISO 4762
Hardness	39-44 HRC
Available Sizes	M2, M3, M4, M5, M6, M8, M10, M12, M16, M20, M24, M30
Package Type	Bulk Plastic Box

5 reviews

Anonymous

Apr 15, 2026

Rating: 5/5

Professional Quality

These are genuine 12.9 grade bolts. I tested the hardness and it meets the specifications for heavy machinery.

Anonymous

Apr 03, 2026

Rating: 5/5

Fast Delivery

Needed them urgently for a project deadline. Shipping was faster than expected and packaging was secure.

Anonymous

Mar 19, 2026

Rating: 5/5

Strong and Reliable

Used these for an engine mount repair. The strength grade is exactly as advertised and they held up under high torque.

Anonymous

Mar 02, 2026

Rating: 5/5

Good Bulk Deal

Bought a large assortment for my workshop. Great value for money compared to local hardware stores.

Anonymous

Feb 21, 2026

Rating: 5/5

Great Precision

Threads are clean and precise. Fit perfectly into my CNC machine components without any cross-threading issues.

5 FAQ

Q: What size Allen key is needed for the M6 bolts?

A: For M6 hex socket cap screws, a 5mm Allen key is typically required.

Q: Are these screws made of stainless steel?

A: No, these are made of high-strength alloy steel with a black oxide finish for corrosion resistance.

Q: Can I return unused boxes if I ordered too many?

A: Yes, unused items in original packaging can be returned within 30 days of delivery.

Q: Is there a torque specification provided?

A: General torque guidelines for Grade 12.9 are available in the product description tab.

Q: Do you sell matching nuts for the M10 size?

A: Yes, we carry compatible Grade 12.9 nuts. Please check our store catalog under nuts and washers.

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