Holo-krome 87143 Flat Socket Cap Screw M8x1.25 45mm

Product Description

The HOLO-KROME 87143 is a metric flat socket cap screw designed for applications requiring a low-profile, flush or countersunk fastener with high tensile strength. Built from 12.9 grade alloy steel with a black oxide finish, this screw delivers corrosion resistance and a clean appearance in demanding assemblies. The 90-degree flat head seats fully into a countersunk hole, eliminating protrusion above the mating surface. Drive engagement is through a 5 mm hex socket. Thread size is M8x1.25 with full threading along the 45 mm overall length. Licensed trades and industrial maintenance technicians specify this grade for structural and high-stress fastening work.

This fastener is suited for precision mechanical assemblies, industrial equipment, tooling fixtures, and structural connections where a countersunk profile is required. The 12.9 material grade makes it appropriate for high-load applications in both light manufacturing and heavy-duty machinery. It meets ANSI B1.13M and ISO 10642 standards, making it a direct fit in metric engineering designs that call for those specifications. Fully threaded construction allows maximum thread engagement across the full screw length, which is important in thin-material or through-bolt applications.

Key Features

• 12.9 alloy steel construction for high tensile and proof load ratings
• 90-degree flat head profile seats flush in countersunk holes
• 5 mm hex socket drive for standard allen key or bit engagement
• Full threading along the 45 mm length maximizes thread engagement
• Black oxide finish provides mild corrosion resistance and low-glare appearance
• Meets ANSI B1.13M and ISO 10642 fastener standards

Compatibility

Designed as an OEM-style and aftermarket replacement metric flat socket cap screw for assemblies specifying M8x1.25 thread, 90-degree countersunk head geometry, and ISO 10642 or ANSI B1.13M compliance.

Installation Notes

Installation is typically performed by millwrights, maintenance technicians, or mechanical assemblers using a calibrated hex key or socket bit sized to 5 mm. Ensure the mating countersink is machined to the correct 90-degree angle and diameter to seat the head fully before torquing. Use a calibrated torque tool appropriate for 12.9 grade M8 fasteners and follow the assembly engineering specifications for the applicable joint. Avoid reusing fasteners removed from high-stress applications, as cyclic loading can reduce clamp load reliability.