Value Collection 211175PR Flat Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION 211175PR is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. It features an 82-degree flat head driven by a 3/16-inch hex socket and is manufactured from alloy steel with a black oxide finish for corrosion resistance. The 5/16-18 UNC thread and 2-1/2-inch overall length make it well-suited for medium-duty mechanical assemblies. The shank is partially threaded, which helps align mating components before full engagement. Machinists, maintenance technicians, and fabricators install this type of fastener in equipment housings, fixtures, and structural assemblies where a low-profile head is required.

This screw is used in general industrial and mechanical applications where a countersunk socket drive fastener is needed. Partial threading provides clamping force across the unthreaded shank, which is useful in applications with thick material stacks or where shear loading is a concern. Black oxide finish offers mild corrosion resistance and reduces light reflection, making it common in tooling, machine frames, and precision fixtures. This fastener is sold individually with a minimum order quantity of 100 pieces.

Key Features

• 82-degree flat head sits flush or below surface in countersunk holes
• 3/16-inch hex socket drive for use with standard Allen keys or socket bits
• 5/16-18 UNC thread form for compatibility with standard inch-system tapped holes
• Partially threaded shank provides shear resistance and improved clamping
• Alloy steel construction for high tensile strength
• Black oxide finish for mild corrosion resistance and low-glare appearance

Compatibility

Designed as an OEM-style replacement or general-use fastener for standard 5/16-18 UNC tapped holes requiring a countersunk flat head socket cap screw per ASME/ANSI B18.3 and ASTM F835.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance technicians using a 3/16-inch hex key or Allen-head socket bit. Ensure the mating hole is properly countersunk to 82 degrees before installation. Apply appropriate thread lubricant or thread-locking compound as required by the application. Do not overtighten, as alloy steel screws in countersunk holes are subject to head pullthrough if torque limits are exceeded.