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Home / Connectors and Fasteners / Grade 14.9 High-Strength Socket Cap Bolts Alloy Steel Black Extended Screws M6 M8 M10 M12 M14 M16
Connectors and Fasteners

Attributes

Brand -
Category Industrial Small Parts / Connectors and Fasteners
Origin -
Material Alloy Steel 40Cr
Strength Grade 14.9
Surface Finish Black Oxide Coating
Thread Standard ISO Metric Coarse
Head Style Hex Socket Cap
Drive Type Internal Hex
Size Range M6, M8, M10, M12, M14, M16
Hardness HRC 45-50
Packaging Bulk Box (100-500 pcs)
Certification ISO 9001 Manufactured

5 reviews

A

Anonymous

Mar 12, 2026

Rating: 4/5

Good but check sizing

Quality is high, but ensure you measure your bore size. M12 fit perfectly in our project.

A

Anonymous

Mar 04, 2026

Rating: 5/5

Reliable supply

We order these monthly for our fabrication shop. Consistency is key and these deliver.

A

Anonymous

Feb 27, 2026

Rating: 5/5

Stronger than expected

Overkill for my home garage but peace of mind is worth it. Black finish looks nice too.

A

Anonymous

Feb 23, 2026

Rating: 5/5

Solid industrial quality

Used these for assembling a custom rig. The tensile strength is noticeable compared to standard bolts.

A

Anonymous

Jan 27, 2026

Rating: 5/5

Great for high torque apps

No stripping on the hex socket even under high tension. Very satisfied with the bulk pricing.

5 FAQ

Q: Can I order mixed sizes in one box?

A: These are sold per size variant. Please add separate items for different diameters.

Q: Are these compatible with stainless nuts?

A: Yes, but ensure galvanic corrosion is managed if used in wet conditions.

Q: What hex key size is needed for M10?

A: An 8mm hex key is typically required for the M10 socket cap screws.

Q: Is there a certificate of conformity included?

A: Yes, bulk orders ship with a material test report upon request.

Q: What is the corrosion resistance rating?

A: Black oxide provides mild resistance. We recommend oiling for outdoor environments.

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