Value Collection 721156PR Flat Socket Cap Screw 1/4-28

Product Description

The VALUE COLLECTION 721156PR is a flat socket cap screw designed for flush or countersunk fastening applications. It features an 82-degree flat head driven by a 5/32-inch hex socket, making it suitable for installations where the fastener head must sit flush with or below the work surface. Constructed from alloy steel with a black oxide finish, the screw provides corrosion resistance and a low-reflectivity appearance. The 1/4-28 UNF thread designation indicates a fine-thread profile, offering strong clamp load in metal-to-metal assemblies. At 1-3/4 inches in overall length with partial threading, it is well suited for applications requiring thread engagement in a tapped hole with a shoulder-style bearing surface.

This screw is a standard fastener used in mechanical, industrial, and maintenance applications where a countersunk, flush-mount profile is required. Partial threading makes it appropriate for through-bolt or shoulder-style installations in metal components, fixtures, jigs, and machinery. Trades and maintenance professionals working in HVAC equipment assembly, electrical enclosures, or plumbing fixture mounting commonly use fine-thread alloy steel fasteners of this type where vibration resistance and precise fit are priorities.

Key Features

• 82-degree flat head sits flush or countersunk with the mating surface
• 5/32-inch hex socket drive for precise torque application with standard Allen keys
• 1/4-28 UNF fine-thread profile for strong clamp load and vibration resistance
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM F835 fastener standards
• Black oxide finish reduces corrosion and surface glare
• Partial threading supports shoulder-style and tapped-hole installations

Compatibility

Designed as a standard 1/4-28 UNF flat socket cap screw conforming to ASME/ANSI B18.3 and ASTM F835, compatible with any tapped or through-hole application specifying an 82-degree flat head alloy steel fastener in that thread class.

Installation Notes

Installation requires a 5/32-inch hex key or Allen driver; use a calibrated torque wrench where fastener preload is specified by the equipment manufacturer. Ensure the mating countersink is machined to an 82-degree angle to achieve full head seating. Power down or de-energize any equipment before accessing fastened panels or enclosures. Follow applicable industry and equipment manufacturer torque guidelines for the thread size and material combination.