Value Collection 43138 M5x0.8 Flat Socket Cap Screw 12.9

Product Description

The VALUE COLLECTION 43138 is a metric flat socket cap screw designed for applications requiring a low-profile, flush-mount fastener. Manufactured from grade 12.9 alloy steel with a black oxide finish, it delivers high tensile strength and moderate corrosion resistance in a compact form. The 90-degree flat head seats flush with or below the mating surface, making it well-suited for assemblies where protruding fastener heads are not acceptable. The hex socket drive accepts a 3.00 mm hex key for installation. This screw measures 16.00 mm in overall length and is fully threaded along its entire shank. Machinists, millwrights, equipment assemblers, and maintenance technicians routinely use this fastener type in precision mechanical assemblies.

This fastener is used in metric-dimensioned mechanical assemblies across industrial, manufacturing, and equipment maintenance settings. The M5x0.8 thread size and 12.9 material grade make it a common choice for securing components in tight-clearance or flush-surface applications. It conforms to DIN 7991, a widely recognized standard for flat-head hex socket screws. Typical applications include machine frames, jigs, fixtures, panels, and equipment housings where a countersunk seating surface has been prepared.

Key Features

• Grade 12.9 alloy steel construction provides high tensile and proof load strength
• 90-degree flat head profile allows flush or sub-flush seating in countersunk holes
• Hex socket drive (3.00 mm) enables installation with a standard hex key or Allen driver
• Fully threaded shank along the full 16.00 mm length for maximum thread engagement
• Black oxide finish provides mild corrosion resistance and reduced light reflection
• Conforms to DIN 7991 fastener standard for consistent dimensional compliance

Compatibility

Designed as a DIN 7991-compliant metric flat socket cap screw suitable for countersunk M5x0.8 threaded holes in metric mechanical assemblies.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance technicians using a 3.00 mm hex key or driven hex bit. Ensure the mating hole is countersunk to a 90-degree included angle to achieve proper head seating. De-energize and lock out equipment before fastener service on live machinery. Inspect thread condition in the mating hole prior to installation to avoid galling or cross-threading.