Value Collection 721154PR Flat Socket Cap Screw 1/4-20 X 4 in

Product Description

The VALUE COLLECTION 721154PR is a flat socket cap screw designed for applications where a flush or countersunk fastener profile is required. Sized at 1/4-20 x 4 inches overall length with partial threading, this screw features an 82-degree flat head and a 5/32-inch hex socket drive. It is manufactured from alloy steel with a black oxide finish that provides moderate corrosion resistance and reduces light reflection in finished assemblies. Licensed tradespeople, machinists, and maintenance technicians working in industrial, mechanical, or structural applications commonly install this fastener where a low-profile head is critical to fit and function.

This flat socket cap screw is suited for use in machine assemblies, fixture plates, and structural connections that call for a countersunk fastener. The 1/4-20 UNC thread pitch makes it compatible with standard inch-series tapped holes conforming to ASME/ANSI B18.3 specifications. It is appropriate for both light industrial and precision manufacturing environments where alloy steel strength and a clean installed appearance are required.

Key Features

• 82-degree flat head profile seats flush in standard countersunk holes
• 5/32-inch hex socket drive for use with standard Allen keys or hex bit drivers
• 1/4-20 UNC thread standard for compatibility with common inch-series tapped holes
• Partially threaded shank allows accurate load-bearing across unthreaded grip length
• Alloy steel construction provides high tensile strength for demanding fastening applications
• Black oxide finish reduces surface glare and offers light corrosion protection

Compatibility

Designed as an OEM-style or general-replacement flat socket cap screw for inch-series tapped holes requiring a 1/4-20 UNC thread. Conforms to ASME/ANSI B18.3 and ASTM F835 fastener standards.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with fastener torque requirements for alloy steel hardware. Before installation, verify that the mating tapped hole and countersink angle match the 82-degree flat head geometry to ensure proper seating. Use the correct 5/32-inch hex key or bit driver to avoid cam-out or drive damage. Do not use an impact driver unless specifically rated for socket cap screws of this size.