Value Collection 721289BR Flat Socket Cap Screw 1/2-13

Product Description

The VALUE COLLECTION 721289BR is a flat socket cap screw designed for flush or countersunk fastening applications in mechanical assemblies and structural connections. It features a 82-degree flat head driven by a 5/16-inch hex socket, and is fully threaded at a 1/2-13 UNC thread size over an overall length of 1-3/8 inches. The screw is machined from alloy steel and finished with black oxide for basic corrosion resistance. It meets ASME/ANSI B18.3 and ASTM F835 fastener standards, making it suitable for precision and industrial fastening work performed by machinists, millwrights, and maintenance technicians.

This screw is used in applications where the fastener head must sit flush with or below the surface of the mating material. Common install scenarios include machine housings, fixtures, jigs, tooling plates, and mechanical assemblies requiring a clean surface profile. The fully threaded body ensures full thread engagement across the clamped joint, which is important in thinner material applications or short-grip situations.

Key Features

• 82-degree flat head profile for flush or countersunk installations
• 5/16-inch hex socket drive for use with standard hex keys or socket tooling
• Fully threaded body at 1/2-13 UNC for maximum thread engagement
• Alloy steel construction for high tensile strength in demanding applications
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Meets ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as a standard 1/2-13 UNC fully threaded flat socket cap screw suitable for countersunk holes machined to an 82-degree included angle per ASME/ANSI B18.3 specifications.

Installation Notes

Installation is performed by machinists, maintenance technicians, or millwrights using a 5/16-inch hex key or socket driver. The mating countersink must be machined to an 82-degree included angle to achieve proper head seating and flush surface fit. Ensure the receiving thread is clean and free of debris before fastening. Do not exceed the rated torque for 1/2-13 alloy steel fasteners as specified by the applicable engineering standard or job specification.