Value Collection 211173PR Flat Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION 211173PR is a flat socket cap screw designed for flush or countersunk fastening applications in metal assemblies. It features an 82-degree flat head with a 3/16-inch hex socket drive and is manufactured from alloy steel with a black oxide finish for corrosion resistance. The 5/16-18 UNC thread and 2-1/4-inch overall length make it suitable for medium-duty structural and mechanical connections. This fastener is partially threaded, allowing it to draw mating parts together cleanly. Machinists, millwrights, and maintenance technicians install this type of screw where a low-profile head sitting flush with or below a work surface is required.

This screw is used in general industrial, manufacturing, and maintenance applications where an inch-system UNC thread is specified. The alloy steel construction provides higher tensile strength than standard steel fasteners, and the black oxide finish offers mild corrosion protection in dry or lightly oiled environments. Typical applications include machine tool assemblies, jigs and fixtures, and equipment enclosures requiring a flush fastener profile. Sold individually with a minimum order quantity of 100 pieces.

Key Features

• 82-degree flat head provides a flush or countersunk profile in mating parts
• 3/16-inch hex socket drive for use with standard Allen or hex key tools
• Alloy steel construction for higher tensile strength than mild steel fasteners
• Black oxide finish for mild corrosion resistance and reduced light reflection
• Partial threading allows clean clamping of stacked components
• Meets ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed for use in 5/16-18 UNC tapped holes following ASME/ANSI B18.3 inch-series specifications. Suitable for applications requiring an 82-degree countersunk flat head socket cap screw per ASTM F835.

Installation Notes

Installation requires a 3/16-inch hex key or Allen driver rated for the torque demands of alloy steel fasteners. Ensure the mating hole is properly countersunk to 82 degrees to achieve full head seating. De-burr and clean the tapped hole before installation. Follow applicable machine assembly standards and torque guidelines for 5/16-18 alloy steel fasteners as specified in your engineering documentation.