Value Collection 581686BR Hex Socket Cap Screw 5/8-18 Unf

Product Description

The VALUE COLLECTION 581686BR is a hex socket cap screw designed for high-strength bolted connections in mechanical, industrial, and trade assembly applications. This fastener features a 5/8-18 UNF thread size with a 5-inch length under head and partial threading along the shank. The 1/2-inch hex drive socket head allows for precise torque application using a standard hex key or Allen wrench. Manufactured from alloy steel with a black oxide finish, this screw offers solid mechanical strength and basic corrosion resistance for interior and protected environments. It conforms to ASME/ANSI B18.3 and ASTM A574 standards, making it suitable for demanding fastening applications.

This cap screw is used in residential and commercial mechanical assemblies, equipment mounting, machine frames, jigs, and structural fastening where a recessed socket drive and fine-thread specification are required. The 5/8-18 UNF thread pitch is common in precision mechanical assemblies where fine adjustment and high clamping force are priorities. The black oxide coating provides light surface protection and reduces glare, making it appropriate for tooling, equipment enclosures, and similar applications where appearance and basic protection matter.

Key Features

• 5/8-18 UNF fine thread for high clamping force and precision fitment
• 5-inch length under head with partial threading along the shank
• 1/2-inch hex socket drive for standard Allen wrench or hex key installation
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish provides light corrosion resistance for protected installations
• Conforms to ASME/ANSI B18.3 socket head cap screw standard

Compatibility

Designed as an OEM-style replacement or direct-fit fastener for mechanical assemblies requiring a 5/8-18 UNF hex socket cap screw with a 5-inch length under head and partial threading.

Installation Notes

Installation is typically performed by machinists, millwrights, or mechanical contractors using a calibrated torque wrench and the appropriate 1/2-inch hex key or Allen bit. Always de-energize and lock out equipment before replacing fasteners in powered assemblies. Verify thread engagement depth and ensure the mating tapped hole meets the required thread specification before applying final torque. Do not substitute a coarse-thread fastener in a fine-thread application.