Value Collection 581677BR Hex Socket Cap Screw 5/8-18 Unf

Product Description

The VALUE COLLECTION 581677BR is a hex socket cap screw designed for high-strength fastening applications where a low-profile head and internal drive are required. Built from alloy steel with a black oxide finish, this fastener measures 3-1/4 inches in length under the head and carries a 5/8-18 UNF thread specification. The 1/2 inch internal hex drive accepts a standard hex key or Allen-type driver. The partial threading design concentrates clamping load at the shank, making it suitable for precision bolted joints in machinery, fixtures, tooling, and structural assemblies. Installation is performed by maintenance technicians, millwrights, machinists, and mechanical contractors.

This screw is used across industrial, commercial, and mechanical maintenance applications wherever a socket-drive fastener is specified. Typical installations include machine frames, jigs and fixtures, pump housings, bearing mounts, and similar bolted assemblies requiring fine-thread engagement. The 5/8-18 UNF thread pitch provides tighter thread engagement than coarse-thread equivalents, making it a common choice where vibration resistance or thin-wall tapped holes are factors. It conforms to ASME/ANSI B18.3 and ASTM A574 standards.

Key Features

• 5/8-18 UNF fine-thread specification for vibration-resistant clamping
• 3-1/4 inch length under head with partial threading for shank-loaded joints
• 1/2 inch hex socket drive accepts standard hex keys and driver bits
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides mild corrosion resistance and reduces glare
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as an OEM-style or replacement fastener for any application requiring a 5/8-18 UNF hex socket cap screw conforming to ASME/ANSI B18.3 and ASTM A574 specifications.

Installation Notes

Installation is performed using a 1/2 inch hex key or hex drive bit; verify that the mating tapped hole is clean and free of debris before installation. Always confirm the tapped hole depth and thread engagement length meet engineering requirements for the joint before torquing. Follow applicable mechanical codes and the equipment manufacturer's specifications for target torque values. Do not use impact tools without verifying that the fastener and joint design are rated for impact installation.