Value Collection 581676BR Hex Socket Cap Screw 5/8-18 Unf

Product Description

The VALUE COLLECTION 581676BR is a partially threaded hex socket cap screw designed for high-strength fastening in mechanical assemblies, tooling fixtures, and structural connections. It features a 5/8-18 UNF thread form, a 3-inch length under head, and a 1/2-inch hex drive socket. Manufactured from alloy steel and finished with a black oxide coating, this fastener delivers solid corrosion resistance in low-moisture environments while meeting ASME/ANSI B18.3 and ASTM A574 standards. Machinists, millwrights, and maintenance technicians rely on socket cap screws like this one for applications where a low-profile head and high clamp load are required.

This screw is suited for precision mechanical work including machine frames, jigs, fixtures, and equipment housings where a recessed drive is preferred over external hex fasteners. The fine 18-threads-per-inch UNF pitch provides tighter thread engagement and improved resistance to vibration loosening compared to coarse-thread equivalents. The black oxide finish reduces light reflection and provides light surface protection. This fastener is sold individually with a minimum order quantity of 10 units per order.

Key Features

• 5/8-18 UNF fine-thread profile for high vibration resistance and precise torque control
• 3-inch length under head accommodates thicker material stacks and deeper engagement
• 1/2-inch hex socket drive for use with standard Allen keys and hex bit drivers
• Alloy steel construction meets ASTM A574 high-strength socket screw requirements
• Black oxide finish provides light corrosion protection and low-reflectance appearance
• Partially threaded shank allows for shoulder-style clamping and shear load transfer

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in any application requiring a 5/8-18 UNF partially threaded fastener with a 1/2-inch hex drive.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance technicians using a calibrated torque wrench and a 1/2-inch hex key or socket bit. Always de-energize and lock out equipment before fastener work on live machinery per applicable OSHA lockout/tagout procedures. Verify that mating threaded holes are clean, properly tapped to UNF specification, and free of debris before driving. Do not substitute this fine-thread fastener in applications requiring coarse-thread UNC engagement without confirming thread compatibility.