Holo-krome 87147 M8x1.25 Flat Socket Cap Screw 70mm 12.9

Product Description

The HOLO-KROME 87147 is a metric flat socket cap screw designed for flush or countersunk fastening applications where a low-profile head is required. It features an M8x1.25 thread and an overall length of 70 mm with partial threading. The 90-degree flat head accepts a 5 mm hex socket drive. Manufactured from 12.9 grade alloy steel with a black oxide finish, this fastener delivers high tensile strength and moderate corrosion resistance. It is suited for precision mechanical assemblies, tooling, and structural joints where head protrusion must be minimized. A licensed mechanic, millwright, or maintenance technician typically installs this fastener in production and industrial settings.

This flat socket cap screw is intended for metric fastening applications in industrial equipment, machine frames, fixtures, and similar assemblies requiring a countersunk socket-drive fastener. The 12.9 material grade indicates very high tensile and proof load ratings, making it appropriate for high-stress joints. The black oxide finish provides mild corrosion resistance and reduces light reflection on finished assemblies. Partial threading is standard for this length-to-diameter ratio, providing clamp load through the unthreaded shank. Thread fit class is 4G per the ANSI B1.13M and ISO 10642 fastener standards.

Key Features

• M8x1.25 metric thread with 70 mm overall length and partial threading
• 90-degree flat head profile for flush countersunk installation
• 5 mm hex socket drive for standard Allen key or socket tooling
• 12.9 alloy steel grade for high tensile and proof load performance
• Black oxide finish for mild corrosion resistance and reduced reflectivity
• Conforms to ANSI B1.13M and ISO 10642 fastener standards

Compatibility

Designed as an OEM-style metric flat socket cap screw for use in countersunk M8 threaded holes conforming to ISO 10642 and ANSI B1.13M specifications. Thread fit class 4G.

Installation Notes

Installation is typically performed by a millwright, machinist, or maintenance technician using a calibrated torque wrench and a 5 mm hex socket or Allen key. Always de-energize and lock out equipment before fastener service. Verify countersink geometry in the mating part matches the 90-degree head angle before final torque. Do not reuse fasteners that show signs of thread deformation or galling.