Holo-krome 86021 Button Cap Screw M5x0.8 20mm Grade 12.9

Product Description

The HOLO-KROME 86021 is a metric button socket cap screw designed for applications requiring a low-profile head with high-strength fastening. Manufactured from Grade 12.9 alloy steel with a black oxide finish, this screw delivers a hardness of 38 HRC and resists corrosion in typical indoor and light industrial environments. The M5x0.8 thread pitch and 20mm length under the head make it a common choice in precision assemblies, machine frames, and equipment enclosures. Drive engagement is via a 3mm hex socket. Installation requires a hex key or hex socket driver and follows ANSI/ASME B18.3 and ASTM F835 fastener standards.

This button cap screw is suited for mechanical assemblies where a flush or near-flush head profile is needed and space constraints limit the use of a standard hex cap screw. Typical applications include industrial machinery, automotive components, robotics, and fabricated metal assemblies requiring a secure, high-clamp-load fastener. The right-hand thread direction and 4G/6G thread fit class ensure consistent engagement across standard metric tapped holes. This fastener is sold in multiples of 100 per minimum order, with one piece per package unit.

Key Features

• Grade 12.9 alloy steel construction with 38 HRC hardness for high-strength fastening
• Black oxide finish provides mild corrosion resistance and a low-glare appearance
• Button head profile delivers a low-profile seating surface ideal for tight clearance applications
• 3mm hex socket drive for precise torque application with standard hex keys or drivers
• Right-hand thread, M5x0.8 pitch, 4G/6G thread fit class for reliable metric thread engagement
• Meets ANSI/ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a direct-fit metric button socket cap screw for standard M5x0.8 tapped holes in metal assemblies conforming to ANSI/ASME B18.3 and ASTM F835 specifications.

Installation Notes

Installation should be performed by a qualified mechanic or assembly technician using a calibrated torque wrench with a 3mm hex socket bit. Ensure the mating tapped hole is clean and free of debris before threading. Do not exceed the rated clamp load for Grade 12.9 hardware, and avoid mixing metric and unified thread standards. Follow applicable industry or equipment manufacturer torque guidelines for M5 fasteners at this grade.