Attributes

Brand	-
Category	Industrial Small Parts / Connectors and Fasteners
Origin	-
Material	Alloy Steel
Strength Grade	12.9
Thread Style	Full Thread
Head Type	Hex Socket Cap
Drive Type	Internal Hex
Surface Finish	Black Oxide
Hardness	HRC 39-44
Tensile Strength	1220 MPa Min
Available Sizes	M3, M5, M6, M8, M10, M24, M30
Package Quantity	10 Pieces per Pack

5 reviews

Anonymous

Mar 26, 2026

Rating: 4/5

Good value

Quality is good for the price. One bolt had a slightly burred head but still usable.

Anonymous

Mar 17, 2026

Rating: 5/5

Perfect fit

Threads were clean and matched my nuts perfectly. Will order again.

Anonymous

Feb 28, 2026

Rating: 5/5

Excellent strength

These bolts held up under significant stress in my automotive project. True 12.9 grade.

Anonymous

Feb 22, 2026

Rating: 5/5

Professional quality

Use these in my shop daily. No stripping on the hex socket even with high torque.

Anonymous

Jan 28, 2026

Rating: 5/5

Hard to find sizes

Finally found M30 extra long bolts. Shipping was fast and packaging protected the threads.

5 FAQ

Q: Is the thread pitch standard coarse?

A: Yes, unless specified otherwise, these come with standard coarse metric thread pitch.

Q: Do you sell matching nuts?

A: Yes, please search for Grade 12 or Grade 10 nuts compatible with metric hex bolts in our store.

Q: Are these suitable for outdoor use?

A: They have black oxide coating which offers limited protection. For outdoor use, we recommend applying grease or using stainless steel.

Q: What hex key size is needed for M8?

A: Typically an 6mm hex key is required for M8 socket cap screws.

Q: Can these be welded?

A: Welding high tensile steel like Grade 12.9 is not recommended as it affects the heat treatment and strength.

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