Value Collection 43157 Flat Socket Cap Screw M8x1.25

Product Description

The VALUE COLLECTION 43157 is a flat socket cap screw engineered for applications requiring a low-profile, flush-mount fastening solution. Built to DIN 7991 standards, this screw features an M8x1.25 metric thread and is fully threaded along its 25 mm overall length. The 90-degree flat head seats flush with or below the mating surface, while the 5 mm hex socket drive allows for high torque input in tight clearance areas. Manufactured from 12.9 grade alloy steel with a black oxide finish, it delivers high tensile strength and moderate corrosion resistance for demanding mechanical assemblies. Licensed trades and industrial maintenance technicians are the typical installers.

This screw is suited for precision mechanical, tooling, and structural assemblies where a countersunk, flush-mounted fastener is required. The M8x1.25 thread pitch and 12.9 material grade make it appropriate for high-load fastening in steel and other ferrous substrates. Typical applications include machine tool components, fixtures, jigs, and fabricated steel assemblies where surface-flush hardware is necessary to avoid interference with mating parts or moving components.

Key Features

• DIN 7991 fastener standard for verified dimensional conformance
• 12.9 alloy steel material grade provides high tensile and proof load strength
• 90-degree flat head profile seats flush with the mating surface
• 5 mm hex socket drive accepts standard hex keys and socket bit drivers
• Black oxide finish offers mild corrosion resistance and reduced light reflection
• Fully threaded along entire 25 mm length for maximum thread engagement

Compatibility

Designed as a metric flat socket cap screw per DIN 7991 for use in any application requiring an M8x1.25 countersunk hex socket fastener in 12.9 alloy steel.

Installation Notes

Installation is typically performed by machinists, millwrights, or mechanical maintenance technicians using a calibrated hex key or socket bit driver sized to 5 mm. Ensure the mating material is drilled and countersunk to the correct 90-degree angle to allow full, flush seating of the head. Apply thread-locking compound or specified preload torque per the equipment manufacturer's fastener guidelines. Do not substitute a lower-grade fastener in applications specifying 12.9 material grade.