Value Collection 721159PR Flat Socket Cap Screw 1/4-28

Product Description

The VALUE COLLECTION 721159PR is a flat socket cap screw designed for precision fastening applications where a flush or countersunk head profile is required. Sized at 1/4-28 UNF x 2-1/4 inches overall length, this screw features an 82-degree flat head driven by a 5/32-inch hex socket. Constructed from alloy steel with a black oxide finish, it delivers solid mechanical strength and moderate corrosion resistance. The partially threaded shank allows for controlled clamping force in assemblies where the unthreaded portion serves as a shoulder or alignment reference. Installation requires a standard 5/32-inch hex key or Allen driver.

This flat socket cap screw is suited for use in mechanical assemblies, tooling fixtures, machine components, and fabrication applications across manufacturing, maintenance, and industrial trades. The 82-degree countersunk head seats flush with or below the surface, making it appropriate for installations where head protrusion is not acceptable. The UNF fine-thread pitch provides precise thread engagement and resistance to loosening in vibration-prone environments. Licensed trades, machinists, and maintenance technicians commonly specify this fastener type for equipment assembly and repair work.

Key Features

• 82-degree flat head for flush countersunk installations
• 5/32-inch hex socket drive for precise torque application
• 1/4-28 UNF fine-thread specification for tight thread engagement
• Partially threaded shank for controlled clamping and alignment
• Alloy steel construction for high tensile strength
• Black oxide finish for mild corrosion protection and reduced light reflection

Compatibility

Designed as an OEM-style replacement or standard-spec fastener for mechanical assemblies requiring a 1/4-28 UNF flat socket cap screw meeting ASME/ANSI B18.3 and ASTM F835 standards.

Installation Notes

Installation is performed by machinists, millwrights, or qualified maintenance technicians using a calibrated 5/32-inch hex key or driver bit. Ensure the mating countersink angle matches 82 degrees before installation to achieve proper head seating and avoid fastener damage. De-energize and lock out all equipment before servicing any assembly containing this fastener. Do not exceed the rated mechanical load for the 1/4-28 thread class specified for the assembly.