Value Collection 721174PR Flat Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION 721174PR is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. The 82-degree flat head seats fully into a countersunk hole, leaving a smooth surface when installed correctly. Driven with a 3/16-inch hex socket key, this screw is manufactured from alloy steel with a black oxide finish that provides a basic level of corrosion resistance and reduces light reflection. The 5/16-18 UNC thread and 3-inch overall length make it suited for medium-duty structural and mechanical assemblies. It is partially threaded. Installers in manufacturing, maintenance, and fabrication work will find this fastener useful across a range of steel and metal assemblies.

This flat socket cap screw is used in applications where a standard hex head or button head would protrude above the work surface and clearance is limited. Common install scenarios include machine frames, jigs, fixtures, brackets, and panel assemblies where a flush fastener face is required. The black oxide finish is suited for dry or lightly oiled indoor environments. This fastener conforms to ASME/ANSI B18.3 and ASTM F835 standards, making it appropriate for general industrial and mechanical assembly work where dimensional and material compliance is required.

Key Features

• 82-degree flat head seats flush in standard countersunk holes
• 3/16-inch hex socket drive for positive torque engagement
• Alloy steel construction for high tensile strength in structural applications
• Black oxide finish reduces surface reflectivity and provides light corrosion resistance
• Partially threaded shank allows for precise clamping of joined materials
• Conforms to ASME/ANSI B18.3 and ASTM F835 standards

Compatibility

Designed for use in standard 82-degree countersunk holes threaded or tapped to 5/16-18 UNC specifications in alloy steel, mild steel, or similar structural materials.

Installation Notes

Installation requires a 3/16-inch hex key or socket driver. Ensure the mating countersunk hole is machined to an 82-degree included angle to achieve full head seating. Verify thread engagement depth meets applicable structural requirements before torquing. Do not exceed the material yield limits of the mating tapped hole when applying torque.