Value Collection 43143 M5x0.8 Flat Socket Cap Screw 12.9

Product Description

The VALUE COLLECTION 43143 is a metric flat socket cap screw designed for flush or countersunk fastening applications where a low-profile head is required. Manufactured from 12.9 grade alloy steel with a black oxide finish, this screw delivers high tensile strength and moderate corrosion resistance. The 90-degree flat head seats into countersunk holes to sit flush with or below the mating surface. Drive engagement is achieved with a 3.00 mm hex socket. The M5x0.8 thread size with 40 mm overall length and partial threading configuration make it well suited for precision assemblies where thread engagement depth matters. Installed by machinists, maintenance technicians, and mechanical assemblers.

This flat socket cap screw is used in machine tool fixtures, precision mechanical assemblies, enclosures, and structural components where a flush head profile is critical. The black oxide finish reduces light reflection and provides a degree of surface protection in dry or lightly oiled environments. Partial threading is appropriate for applications requiring a smooth shank section to bear shear loads or to clamp materials of defined thickness. Conforms to DIN 7991 fastener standard.

Key Features

• 90-degree flat head profile for flush countersunk installation
• 12.9 grade alloy steel for high tensile and proof load strength
• Black oxide finish for reduced reflectivity and light surface protection
• 3.00 mm hex socket drive for positive torque engagement
• Partially threaded shank per DIN 7991 standard
• Metric thread standard M5x0.8 for precise thread fit

Compatibility

Designed as a DIN 7991 metric flat socket cap screw compatible with standard M5x0.8 countersunk hex socket applications in machine assemblies and fixtures.

Installation Notes

Installation requires a calibrated 3.00 mm hex key or socket driver. Countersink the mating material to a 90-degree included angle to achieve proper head seating. De-energize, depressurize, or lock out any equipment before fastener replacement or assembly work. Avoid over-torquing 12.9 grade fasteners without consulting applicable engineering torque specifications for the joint design.