Value Collection 307118PR Hex Socket Cap Screw 5/16-18 Unc

Product Description

The VALUE COLLECTION 307118PR is a partially threaded hex socket cap screw designed for high-strength fastening applications in mechanical assembly, fabrication, and maintenance work. It features a 5/16-18 UNC thread size and a 2-1/2 inch length under head, providing substantial grip depth for secure clamping. The 7/32 inch hex drive accepts a standard Allen key or hex bit. Constructed from alloy steel and finished with a black oxide coating, this fastener meets ASTM A574 standards, which specify mechanical requirements for alloy steel socket-head cap screws. Machinists, millwrights, and maintenance technicians regularly use this fastener type in demanding service environments.

This screw is suited for use in general industrial machinery, equipment assembly, tooling fixtures, and structural mechanical connections where a recessed drive and high tensile strength are required. The black oxide finish provides mild corrosion resistance and reduces light reflection, making it appropriate for both shop-floor machinery and field repair applications. Partial threading allows for precise clamping without thread engagement through the full grip length.

Key Features

• 5/16-18 UNC thread for broad compatibility with standard tapped holes
• 2-1/2 inch length under head with partial threading for controlled clamping
• 7/32 inch hex socket drive accepts standard Allen keys and hex bits
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide coating provides mild corrosion resistance and low-reflectance finish

Compatibility

Designed as a standard ASTM A574 alloy steel hex socket cap screw suitable for any application requiring a 5/16-18 UNC partially threaded fastener with a 2-1/2 inch length under head.

Installation Notes

Installation should be performed by a qualified mechanic or technician using a properly sized 7/32 inch hex key or socket bit driver. Always verify that the mating tapped hole meets 5/16-18 UNC thread specifications before driving the fastener. Do not exceed the rated torque for this fastener grade; refer to ASTM A574 published torque tables for the appropriate value. Inspect threads and seating surfaces for damage before installation to ensure a reliable joint.