Value Collection 721040PR Flat Socket Cap Screw 4-48 X 1/4 in

Product Description

The VALUE COLLECTION 721040PR is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. It features an 82-degree flat head driven by a 1/16 inch hex socket and is fully threaded along its 1/4 inch overall length. The thread specification is 4-48 UNF, an extra-fine thread pitch suited for precise, tight-tolerance assemblies. Constructed from alloy steel with a black oxide finish, this screw offers solid mechanical strength and moderate corrosion resistance. It is typically installed by machinists, millwrights, and maintenance technicians working on mechanical assemblies, fixtures, or instrumentation panels. Minimum order quantity is 100 pieces.

This fastener is used in applications where the screw head must sit flush with or below the surface of the mating material. Common uses include precision machine components, electronic enclosures, jigs, fixtures, and light-duty structural assemblies where a low-profile head is required. The extra-fine 4-48 UNF thread makes this screw well suited for thin-walled parts or materials where coarse threads would not provide adequate engagement. The black oxide finish blends into dark-finished surfaces and provides a mild level of protection against oxidation in dry or low-humidity environments.

Key Features

• 82-degree flat head profile for flush or countersunk installations
• 1/16 inch hex socket drive for precise torque application in confined spaces
• 4-48 UNF extra-fine thread for tight-tolerance and thin-material applications
• Fully threaded 1/4 inch overall length maximizes thread engagement
• Alloy steel construction provides high tensile strength
• Black oxide finish offers mild corrosion resistance and low-reflectance appearance
• Meets ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style or replacement flat socket cap screw for assemblies requiring a 4-48 UNF thread, 1/4 inch overall length, and 82-degree countersunk flat head per ASME/ANSI B18.3 and ASTM F835 standards.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 1/16 inch hex key or Allen driver. Ensure the mating countersink is machined to an 82-degree included angle to achieve proper head seating. De-energize or lock out any equipment before fastener service per applicable safety procedures. Do not exceed the rated mechanical limits of the alloy steel material when applying torque.