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Home / Connectors and Fasteners / Grade 12.9 Black High-Strength Flat Head Socket Cap Screws M3 M4 M5 M6 M8 M10
Connectors and Fasteners

Attributes

Brand -
Category Industrial Small Parts / Connectors and Fasteners
Origin -
Material Alloy Steel
Strength Grade 12.9
Surface Finish Black Oxide
Head Style Flat Head (Countersunk)
Drive Type Hex Socket (Allen)
Thread Type Coarse Metric
Size Range M3, M4, M5, M6, M8, M10
Hardness 39-44 HRC
Standard DIN 7991 / ISO 10642
Package Type Bulk Box

5 reviews

A

Anonymous

Mar 27, 2026

Rating: 5/5

Great Value

Better price than local hardware store and the grade is genuine 12.9.

A

Anonymous

Mar 03, 2026

Rating: 5/5

True to Size

Metric measurements are accurate. The countersunk head sits flush exactly as needed.

A

Anonymous

Feb 27, 2026

Rating: 4/5

Good Product

Solid screws, slight variation in black finish but does not affect performance.

A

Anonymous

Feb 25, 2026

Rating: 5/5

Excellent Strength

These bolts handled high tension without stripping. Perfect for my machinery repair project.

A

Anonymous

Feb 23, 2026

Rating: 5/5

Perfect for Machinery

Used on CNC equipment, no issues under vibration. High quality steel.

5 FAQ

Q: Are the threads full length?

A: Yes, these countersunk cap bolts are fully threaded along the shaft.

Q: What key size is needed for M8?

A: An M8 hex socket flat head screw typically requires a 6mm Allen key.

Q: Are these screws rust proof?

A: Black oxide provides limited protection against corrosion. They are not recommended for wet or outdoor environments.

Q: Do you have M12 size available?

A: Currently this listing is limited to sizes up to M10. Please check our other listings for larger diameters.

Q: Can I use these on aluminum parts?

A: Yes, but ensure you apply proper torque to avoid stripping the softer aluminum threads.

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