Value Collection 211181PR Flat Socket Cap Screw 5/16-24

Product Description

The VALUE COLLECTION 211181PR is a flat socket cap screw designed for applications where a flush or countersunk fastener profile is required. Manufactured from alloy steel with a black oxide finish, this screw measures 5/16-24 (UNF) in thread size and 3/4 inches in overall length. The 82-degree flat head seats flush with or below the work surface, and the 3/16-inch hex socket drive allows installation with a standard hex key. It is fully threaded along its length, providing consistent clamping force across the full engagement zone. Machinists, maintenance technicians, and mechanical assembly professionals typically install this fastener in precision equipment, tooling fixtures, and structural components.

This fastener is suited for both light industrial and mechanical assembly environments where a low-profile, countersunk fastener is needed. The black oxide finish provides mild corrosion resistance and reduces light reflection, making it a common choice for tooling plates, machine guarding, and interior mechanical assemblies. The UNF (Unified Fine) thread standard offers tighter thread engagement compared to coarse-pitch alternatives, which is advantageous in thin-material applications or where vibration resistance is needed.

Key Features

• 82-degree flat head profile for flush or countersunk installation
• 3/16-inch hex socket drive compatible with standard hex keys and allen wrenches
• Fully threaded 3/4-inch length for maximum thread engagement
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM F835 fastener standards
• Black oxide finish for mild corrosion resistance and low-reflectance appearance
• UNF thread standard (5/16-24) for fine-pitch applications requiring tight tolerance fits

Compatibility

Designed as an OEM-style replacement or standard-fit fastener for applications requiring a 5/16-24 UNF fully threaded flat socket cap screw per ASME/ANSI B18.3 and ASTM F835 specifications.

Installation Notes

Install using a 3/16-inch hex key or T-handle allen wrench; ensure the mating countersink is machined to an 82-degree included angle for proper head seating. Verify the tapped hole meets UNF thread class requirements before installation. Do not exceed the rated tightening torque for the fastener grade and material combination being used. Always degrease mating surfaces and inspect threads for damage before assembly.