Value Collection 581437PR Hex Socket Cap Screw 5/16-18 Unc

Product Description

The VALUE COLLECTION 581437PR is a hex socket cap screw designed for high-strength fastening in mechanical, structural, and industrial assemblies. With a 5/16-18 UNC thread and a 5-1/2 inch length under head, this screw is partially threaded, allowing it to clamp two or more components together with the unthreaded shank providing shear resistance. The 1/4 inch hex drive requires a standard hex key or Allen-type driver. Manufactured from alloy steel with a black oxide finish, it meets ASME/ANSI B18.3 and ASTM A574 standards for socket cap screws. Machinists, millwrights, maintenance technicians, and fabricators regularly specify this fastener type in precision assemblies.

This socket cap screw is suited for applications where a flush or recessed fastener head is required and where high clamping force is needed in a compact footprint. Common installation scenarios include machine frames, jigs and fixtures, tooling plates, and equipment housings in industrial and commercial settings. The black oxide finish provides mild corrosion resistance and reduces light reflection, making it appropriate for interior mechanical environments.

Key Features

• 5/16-18 UNC thread — coarse thread series for fast engagement and strong pull-out resistance
• 5-1/2 inches length under head with partial threading for combined clamping and shear load performance
• 1/4 inch hex socket drive for use with standard hex keys or Allen drivers
• Alloy steel construction meets ASTM A574 high-strength socket cap screw specification
• Black oxide finish provides mild corrosion resistance suitable for interior applications
• Conforms to ASME/ANSI B18.3 dimensional standards for consistent fit and interchangeability

Compatibility

Designed as an OEM-style and aftermarket replacement hex socket cap screw for industrial, mechanical, and fabrication applications requiring a 5/16-18 UNC partially threaded fastener with a 1/4 inch hex drive.

Installation Notes

Installation is performed by machinists, maintenance technicians, or qualified fabricators using a 1/4 inch hex key or Allen driver. Ensure mating threaded holes are clean and free of debris before driving. Apply appropriate thread lubricant or fastener compound per the assembly specification. Tighten to the torque value specified by the equipment manufacturer or applicable engineering drawing — do not estimate torque without a calibrated torque wrench on structural or safety-critical joints.