Value Collection 581594PR Hex Socket Cap Screw 1/2-20 Unf

Product Description

The VALUE COLLECTION 581594PR is a hex socket cap screw designed for high-strength fastening in mechanical assemblies, tooling fixtures, and industrial equipment. It features a 1/2-20 UNF thread and measures 5 inches in length under the head. The screw is partially threaded, manufactured from alloy steel, and finished with a black oxide coating that provides moderate corrosion resistance and reduces light reflection. This fastener meets ASME/ANSI B18.3 and ASTM A574 standards, confirming it is rated for high-tensile applications. Machinists, maintenance mechanics, and industrial technicians typically install this type of screw.

This socket cap screw is suited for use in precision machine components, jigs, dies, and structural assemblies where a flush or recessed fastener profile is required. The 1/2-20 UNF fine thread provides strong clamping force and is well-suited for applications that require precise torque control or frequent disassembly. The 3/8 inch hex drive accepts a standard hex key or socket driver. The black oxide finish makes it a common choice in shop-floor and fabrication environments.

Key Features

• 1/2-20 UNF fine thread for precise clamping and secure engagement
• 5 inch length under head for deep-reach or thick-material fastening
• Partially threaded shank reduces stress concentration in high-load joints
• Alloy steel construction meets ASTM A574 high-tensile requirements
• Black oxide coating provides mild corrosion resistance and low-glare finish
• 3/8 inch hex socket drive compatible with standard hex keys and socket drivers

Compatibility

Designed as a standard-dimension replacement or new-installation socket cap screw for any application requiring a 1/2-20 UNF partially threaded hex socket fastener conforming to ASME/ANSI B18.3.

Installation Notes

Installation is performed by machinists or maintenance mechanics using a 3/8 inch hex key or hex bit driver. De-energize and lock out any equipment before fastener replacement or assembly work. Follow applicable torque guidance from the equipment manufacturer or a current edition of the ASME B18.3 standard. Do not use an impact driver on fine-thread socket cap screws without a torque-limiting attachment, as over-torquing can strip the UNF thread or fracture the fastener head.