Value Collection 581661BR Hex Socket Cap Screw 5/8-11 Unc

Product Description

The Value Collection 581661BR is a hex socket cap screw engineered for high-strength fastening applications in industrial, mechanical, and structural assemblies. It features a 5/8-11 UNC thread size and a 9.5-inch length under head, making it suitable for deep-reach clamping and bolted joint applications where standard-length fasteners fall short. Constructed from alloy steel with a black oxide finish, the screw offers solid tensile strength and moderate corrosion resistance in controlled environments. Drive engagement is via a 1/2-inch hex socket. The partially threaded shank provides a smooth bearing surface along the unthreaded portion, which helps maintain alignment and reduce stress concentration at the joint.

This socket cap screw is used in machine bases, fixture plates, tooling assemblies, and heavy equipment where a recessed-drive, high-strength fastener is required. The 5/8-11 UNC coarse thread is a widely used pitch for structural bolting in steel-to-steel applications. Machinists, millwrights, maintenance technicians, and fabricators typically install this type of fastener in production machinery, press frames, conveyor systems, and similar heavy-duty mechanical assemblies.

Key Features

• 5/8-11 UNC coarse thread for strong thread engagement in steel assemblies
• 9.5-inch length under head provides extended reach for deep-stack clamping
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM A574 standards
• Black oxide finish offers mild corrosion resistance and reduces galling during installation
• Partially threaded shank supports precise alignment and shear load transfer
• 1/2-inch hex socket drive for use with standard hex keys and socket tooling

Compatibility

Designed as a standard replacement or stock fastener for applications requiring a 5/8-11 UNC hex socket cap screw conforming to ASME/ANSI B18.3 and ASTM A574 specifications.

Installation Notes

Installation should be performed by a qualified mechanic, machinist, or millwright using a calibrated torque wrench and a properly sized 1/2-inch hex key or socket driver. Always ensure mating threads are clean and free of debris before installation, and verify that the tapped hole depth is sufficient for the full threaded engagement length. Power down and de-energize any associated equipment before fastener service. Follow applicable facility safety procedures and torque specifications provided by the equipment manufacturer or structural engineer of record.