Value Collection 211303PR Flat Socket Cap Screw 1/2-13

Product Description

The VALUE COLLECTION 211303PR is a flat socket cap screw designed for countersunk fastening applications in metal assemblies and structural components. It features a 1/2-13 UNC thread with a 2-1/2 inch overall length and is constructed from alloy steel with a black oxide finish. The 82-degree flat head seats flush with the mating surface when properly countersunk, reducing protrusion and interference with adjoining parts. Drive engagement is through a 5/16 inch hex socket. The screw is partially threaded, providing a smooth shank section useful for applications requiring precise shear loading or slip-fit alignment. Machinists, millwrights, and maintenance mechanics are the typical installers.

This screw is suited for use in general industrial assemblies, machine frames, fixtures, and tooling where a flush-mount fastener is required. The black oxide finish provides moderate corrosion resistance in low-humidity indoor environments and reduces light reflection on exposed surfaces. The alloy steel construction supports higher tensile and shear loads compared to standard steel grades. It meets ASME/ANSI B18.3 and ASTM F835 fastener standards, making it appropriate for engineered assemblies where documented material compliance is required.

Key Features

• 82-degree flat head seats flush in standard countersunk holes
• 5/16 inch hex socket drive for high-torque installation with Allen wrenches or hex bit drivers
• Partially threaded shank supports shear loading and slip-fit alignment
• Alloy steel construction for elevated tensile and shear strength
• Black oxide finish for reduced surface reflection and light corrosion resistance
• Meets ASME/ANSI B18.3 and ASTM F835 standards

Compatibility

Designed as a standard 1/2-13 UNC flat socket cap screw compatible with countersunk holes tapped or clearance-drilled to ASME/ANSI B18.3 specifications in industrial and mechanical assemblies.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance mechanics using a 5/16 inch hex key or hex socket bit. De-energize and lock out all equipment before installing or removing fasteners in live assemblies. Ensure the mating countersink angle matches the 82-degree head geometry to achieve proper flush seating and full load distribution. Do not exceed the torque capacity of the alloy steel grade for the given thread size; consult applicable fastener torque tables for 1/2-13 UNC alloy steel screws.