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Home / Connectors and Fasteners / Grade 12.9 High-Strength Socket Head Cap Screws M3 M4 M5 M6 M8 M20
Connectors and Fasteners

Attributes

Brand -
Category Industrial Small Parts / Connectors and Fasteners
Origin -
Material Composition Alloy Steel 42CrMo
Strength Class Grade 12.9
Head Type Cylindrical Hex Socket
Thread Standard ISO Metric Coarse
Surface Treatment Black Oxide Coating
Drive Type Internal Hexagon
Hardness Rating 39-44 HRC
Tensile Strength 1220 MPa Min
Package Quantity 100 Pieces per Box
Country of Origin Manufactured in Asia

5 reviews

A

Anonymous

Apr 16, 2026

Rating: 5/5

Perfect Fit

M6 size fit perfectly into my assembly. No issues with threading or alignment.

A

Anonymous

Apr 15, 2026

Rating: 5/5

Professional Grade

We use these in our workshop regularly. Consistent quality across all sizes ordered.

A

Anonymous

Apr 06, 2026

Rating: 5/5

Strong and Reliable

Perfect for high tension applications. Very satisfied with the strength and finish.

A

Anonymous

Mar 25, 2026

Rating: 5/5

Excellent Quality

Used these for a CNC project. Threads are precise and heads didn't strip under high torque.

A

Anonymous

Mar 20, 2026

Rating: 4/5

Good Value

Great bolts, though shipping took a bit longer than expected. Product itself is solid.

5 FAQ

Q: Is M20 size currently in stock?

A: Yes, all listed sizes including M20 are currently available for immediate dispatch.

Q: What torque should I apply for M8 bolts?

A: Please refer to standard torque charts for Grade 12.9 M-series bolts based on your lubrication conditions.

Q: Are Allen keys included in the box?

A: No, fasteners are sold separately from tools. Please purchase drive keys separately.

Q: Do you provide material certificates?

A: Certificates of conformity are available for bulk orders upon request before shipment.

Q: Are these corrosion resistant?

A: They have black oxide coating for mild protection but are not stainless steel. Use oil for outdoor settings.

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