Value Collection 721250PR Flat Socket Cap Screw 1/2-13

Product Description

The VALUE COLLECTION 721250PR is a flat socket cap screw designed for structural and mechanical fastening applications where a flush or countersunk head profile is required. It features a 1/2-13 UNC thread and an overall length of 5-1/2 inches with partial threading, allowing engagement in standard tapped holes while maintaining shank strength along the unthreaded section. The 82-degree flat head seats into a countersunk hole, eliminating protrusion above the mating surface. Drive engagement is through a 5/16-inch hex socket, requiring a standard Allen key or hex bit driver. Constructed from alloy steel with a black oxide finish, this fastener provides moderate corrosion resistance in interior and low-humidity environments. Machinists, millwrights, and maintenance mechanics are the primary installers.

This screw is used in machinery assembly, tooling fixtures, structural steel fabrication, and general industrial mechanical assemblies where a flush-mount fastening solution is needed. The partial threading is suited for applications requiring a grip length through clearance holes before engaging a threaded bore. The black oxide finish provides a clean, low-reflectance appearance and light surface protection. It is sold individually with a minimum order quantity of one, making it suitable for service replacement and small-batch use as well as production environments.

Key Features

• 82-degree flat head seats flush in standard countersunk holes, eliminating surface protrusion
• 1/2-13 UNC thread meets ASME/ANSI B18.3 and ASTM F835 fastener standards
• Partial threading provides a full shank grip length for clearance-hole applications
• 5/16-inch hex socket drive compatible with standard Allen keys and hex bit drivers
• Alloy steel construction with black oxide finish for strength and light corrosion resistance
• Overall length of 5-1/2 inches suits deep-reach or thick-material fastening scenarios

Compatibility

Designed as a standard replacement or new-installation fastener for any application requiring a 1/2-13 UNC flat socket cap screw with an 82-degree head angle, conforming to ASME/ANSI B18.3 and ASTM F835 specifications.

Installation Notes

Installation is performed by machinists, millwrights, or qualified maintenance personnel using a 5/16-inch hex key or hex bit driver. The mating hole must be properly countersunk to 82 degrees before installation to ensure correct head seating and load distribution. De-energize and lock out any machinery before fastening into assemblies with moving or powered components. Do not exceed the rated torque specifications for the fastener grade and size as defined in standard torque reference tables for 1/2-13 alloy steel fasteners.