Value Collection -48409-6 Flat Socket Cap Screw 7/8-9

Product Description

The VALUE COLLECTION -48409-6 is a flat socket cap screw designed for applications requiring a low-profile, flush-mount fastening solution. The screw features an 82-degree flat head with a 9/16-inch hex socket drive and is fully threaded along its 2.5-inch overall length. Nominal thread size is 7/8-9 UNC. Constructed from alloy steel with a black oxide finish, this fastener delivers solid mechanical strength and moderate corrosion resistance in controlled environments. Each package contains 5 screws. Ideal for maintenance, fabrication, and repair tasks handled by millwrights, machinists, and general mechanical trades.

This screw is suited for use in machinery assemblies, fixtures, jigs, and structural fabrication where a countersunk socket drive fastener is required. The 82-degree flat head seats flush with the mating surface, eliminating protrusion in clearance-sensitive assemblies. The UNC thread form is the standard for inch-series fasteners used across industrial and commercial mechanical applications. The black oxide finish provides a low-reflectance appearance and light surface protection, making it a common choice in machine shops and manufacturing environments.

Key Features

• 82-degree flat head profile seats flush with mating surface for clearance-sensitive assemblies
• 9/16-inch hex socket drive for use with standard hex keys or socket drive tools
• Fully threaded 7/8-9 UNC along the full 2.5-inch overall length
• Alloy steel construction provides high tensile strength for demanding mechanical applications
• Black oxide finish reduces surface glare and offers light corrosion protection in dry environments
• Meets ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style replacement or standard-service fastener for inch-series mechanical assemblies requiring a 7/8-9 UNC fully threaded flat socket cap screw with an 82-degree countersink head profile.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance mechanics using a calibrated hex key or socket drive tool sized to the 9/16-inch drive. Verify that the mating hole is countersunk to an 82-degree angle to ensure full head seating. De-energize or lock out all machinery before fastener removal or installation per applicable OSHA lockout/tagout procedures. Do not substitute a hex key of incorrect size, as this may round the socket drive.