Value Collection 581572PS Hex Socket Cap Screw 1/2-20 Unf

Product Description

The VALUE COLLECTION 581572PS is an alloy steel hex socket cap screw designed for high-strength fastening in mechanical assemblies and structural applications. The screw features a 1/2-20 UNF thread size, a 1/2-inch length under head, and a 3/8-inch hex drive socket. The black oxide finish provides moderate corrosion resistance and reduces light reflection on tooled surfaces. This fastener meets ASME/ANSI B18.3 and ASTM A574 standards, confirming it is manufactured to recognized dimensional and mechanical property requirements. It is fully threaded along its length, making it suitable for through-hole and threaded insert applications.

This hex socket cap screw is commonly used in precision machinery, manufacturing fixtures, hydraulic assemblies, and general industrial fabrication where fine-thread engagement and reliable clamping load are required. Fine-thread UNF fasteners are well suited for thin-walled materials and applications where vibration resistance and controlled torque are priorities. Machinists, millwrights, maintenance technicians, and mechanical contractors are the primary installers of this fastener type.

Key Features

• 1/2-20 UNF fine thread for precise engagement and vibration resistance
• Fully threaded shank for maximum thread engagement in through-hole applications
• 3/8-inch hex drive socket compatible with standard hex keys and socket drivers
• Alloy steel construction rated to ASTM A574 mechanical property requirements
• Black oxide finish for surface protection and reduced surface reflectivity
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in any application requiring a 1/2-20 UNF fully threaded fastener with a 3/8-inch hex drive.

Installation Notes

Installation requires a 3/8-inch hex key or socket driver. Power down or de-energize any associated equipment before servicing fastened assemblies. Apply appropriate thread lubricant or threadlocking compound as specified by the assembly manufacturer to achieve accurate clamp load. Inspect threads on mating components for damage or contamination before installation.