Holo-krome 87144 Flat Socket Cap Screw M8x1.25 40mm

Product Description

The HOLO-KROME 87144 is a metric flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. Manufactured from 12.9 grade alloy steel with a black oxide finish, this screw delivers high tensile strength and moderate corrosion resistance in a compact, low-profile head. It features an M8x1.25 thread and measures 40 mm in overall length, fully threaded from head to tip. The 90-degree flat head seats cleanly into countersunk holes, making it a dependable choice where a protruding head would interfere with mating surfaces or moving components.

This fastener is suited for precision mechanical assemblies, tooling fixtures, machine bases, and industrial equipment where high clamping force and a flush finish are required. The hex socket drive accepts a 5 mm hex key, allowing high torque application in tight clearances. Both manufacturing and maintenance technicians working on metalworking equipment, automation systems, and structural machine components regularly specify this type of fastener.

Key Features

• 12.9 grade alloy steel construction for high tensile and proof load capacity
• 90-degree flat head profile seats flush in standard countersunk holes
• Black oxide finish provides a uniform matte appearance with light corrosion resistance
• Fully threaded along the entire 40 mm length for maximum engagement in thin or shallow materials
• 5 mm hex socket drive compatible with standard hex keys and hex-bit drivers
• Conforms to ANSI B1.13M and ISO 10642 fastener standards

Compatibility

Designed as an OEM-style metric flat socket cap screw for use in standard M8x1.25 countersunk holes conforming to ISO 10642 and ANSI B1.13M specifications.

Installation Notes

Installation is performed using a 5 mm hex key or hex-bit driver. Ensure the mating countersink angle is machined to 90 degrees to achieve full head seating and proper load distribution. Verify hole depth and thread engagement before final torquing. De-grease mating surfaces and inspect thread fit class 4G compatibility before assembly.