Value Collection 211311PR Flat Socket Cap Screw 1/2-20

Product Description

The VALUE COLLECTION 211311PR is a flat socket cap screw sized 1/2-20 x 1-1/4 inches, manufactured from alloy steel with a black oxide finish. The 82-degree flat head sits flush with or below the mating surface when properly countersunk, making it well suited for assemblies where a low-profile or recalibrated surface is required. Drive engagement is through a 5/16-inch hex socket. The screw is fully threaded along its 1-1/4-inch overall length and uses a UNF (Unified National Fine) thread standard. It is installed by machinists, millwrights, and maintenance technicians working on mechanical assemblies, fixtures, and tooling.

This flat socket cap screw is used in applications where a flush or countersunk fastener is needed and a fine-thread engagement is required for precision fit or vibration resistance. The 1/2-20 UNF thread pitch provides tighter thread engagement than coarse-thread equivalents, making it a common choice in machine components, jigs, fixtures, and industrial equipment. The black oxide finish offers mild corrosion resistance and reduces light reflection on finished assemblies. Sold individually, with a minimum order quantity of 10 units.

Key Features

• 82-degree flat head profile seats flush in standard countersunk holes
• 5/16-inch hex socket drive for secure torque application with standard Allen keys or hex bits
• 1/2-20 UNF thread provides fine-pitch engagement for precision and vibration-resistant installations
• Fully threaded along the entire 1-1/4-inch overall length
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM F835 fastener standards
• Black oxide finish provides mild corrosion resistance and low surface reflectivity

Compatibility

Designed for use in countersunk applications requiring a 1/2-20 UNF fully threaded flat socket cap screw conforming to ASME/ANSI B18.3 and ASTM F835 standards.

Installation Notes

Installation is performed using a 5/16-inch hex key or hex socket bit. The mating hole must be properly countersunk to an 82-degree included angle to allow the flat head to seat flush. Ensure threads in the receiving material are clean and free of debris before driving. Do not exceed the torque capacity of the alloy steel fastener or the receiving material.