Value Collection 211305PR Flat Socket Cap Screw 1/2-13x3

Product Description

The VALUE COLLECTION 211305PR is a flat socket cap screw designed for flush or countersunk fastening applications in metal and structural assemblies. It features an 82-degree flat head with a 5/16-inch hex socket drive, allowing installation with a standard hex key. The 1/2-13 UNC thread and 3-inch overall length make it suited for medium-to-heavy fastening tasks. Manufactured from alloy steel with a black oxide finish, it offers solid mechanical strength and moderate corrosion resistance. Partial threading allows the unthreaded shank to act as a shoulder in clearance holes. Machinists, millwrights, and maintenance technicians are the primary installers of this fastener.

This screw is commonly used in machinery frames, fixtures, tooling plates, and structural fabrication where a flush or recountersunk head profile is required. The UNC thread standard makes it compatible with standard inch-series tapped holes. Applications span general industrial maintenance, OEM machine assembly, and fabrication shops. The black oxide finish is suited for indoor or low-moisture environments where a dark, low-reflectance appearance is also desired.

Key Features

• 82-degree flat head profile seats flush in standard countersunk holes
• 5/16-inch hex socket drive for torque application with a hex key or hex bit driver
• 1/2-13 UNC thread for compatibility with standard inch-series tapped holes
• Partially threaded shank functions as a shoulder in clearance-fit assemblies
• Alloy steel construction provides high tensile and shear strength
• Black oxide finish reduces surface reflectance and offers light corrosion resistance

Compatibility

Designed as a standard inch-series flat socket cap screw for use in any application requiring a 1/2-13 UNC tapped hole and a countersunk head seating at 82 degrees per ASME/ANSI B18.3 and ASTM F835 standards.

Installation Notes

Installation requires a 5/16-inch hex key or hex bit driver. The mating hole must be countersunk to 82 degrees to achieve proper head seating. Confirm the tapped hole meets 1/2-13 UNC specifications before installation. De-energize or lock out any machinery before performing fastener service in accordance with applicable OSHA lockout/tagout procedures.