Holo-krome 87040 Flat Socket Cap Screw M4x0.7 20mm

Product Description

The HOLO-KROME 87040 is a metric flat socket cap screw engineered for applications requiring a flush or countersunk fastener profile. Built from 12.9 grade alloy steel with a black oxide finish, this screw delivers high tensile strength and moderate corrosion resistance in demanding mechanical assemblies. The 90-degree flat head seats flush with or below the workpiece surface, eliminating protrusions that could interfere with mating components. Drive engagement is through a 2.55 mm hex socket, requiring an appropriate Allen-type key for installation. Thread size is M4x0.7, with an overall length of 20 mm. This fastener meets ANSI B1.13M and ISO 10642 standards and is installed by machinists, millwrights, and mechanical contractors.

The 87040 is suited for precision mechanical assemblies, machine frames, fixtures, and enclosures where a countersunk fastener is required and space above the surface is limited. The 12.9 grade material classification indicates an exceptionally high-strength fastener appropriate for high-load, close-tolerance applications in industrial and OEM manufacturing environments. The black oxide finish provides a modest layer of surface protection and reduces light reflection, making it a common choice in tooling, robotics, and machine building applications.

Key Features

• 90-degree flat head profile seats flush for countersunk installations
• 12.9 grade alloy steel provides high tensile and proof load strength
• Black oxide finish for moderate corrosion resistance and low-reflectance appearance
• 2.55 mm hex socket drive for precise torque application with standard Allen keys
• M4x0.7 thread with 4G thread fit class per metric thread standard
• Meets ANSI B1.13M and ISO 10642 fastener standards

Compatibility

Designed as an OEM-style metric flat socket cap screw for use in countersunk fastener applications conforming to ISO 10642 and ANSI B1.13M dimensional and thread standards.

Installation Notes

Installation is typically performed by machinists, millwrights, or mechanical assembly technicians using a calibrated hex key or Allen driver sized to 2.55 mm. Countersink the mating hole to the correct 90-degree included angle before installation to ensure proper head seating. De-energize and lock out any equipment before fastening components in live machinery per OSHA lockout-tagout procedures. Do not substitute a lower-grade fastener in any joint originally specified for 12.9 grade hardware.