Value Collection 581580PS Hex Socket Cap Screw 1/2-20 Unf

Product Description

The VALUE COLLECTION 581580PS is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling fixtures, and equipment maintenance. It features a 1/2-20 UNF thread — a fine-thread specification that provides superior holding strength and resistance to loosening under vibration. The 3/8-inch hex drive accepts a standard hex key or Allen driver. Constructed from alloy steel with a black oxide finish, this fastener delivers corrosion resistance suitable for indoor and moderate-exposure environments. The 1-1/8-inch length under head provides adequate thread engagement for medium-depth tapped holes.

This screw is commonly used in industrial maintenance, machine assembly, and structural fastening tasks where a recessed drive head is required to sit flush or below the workpiece surface. The fine UNF thread pitch makes it well-suited for precision applications and assemblies where controlled clamping force is important. Licensed machinists, maintenance mechanics, and field technicians routinely install this type of fastener across a wide range of equipment.

Key Features

• 1/2-20 UNF fine-thread specification for superior vibration resistance and precise clamping
• Fully threaded along the 1-1/8-inch length under head for maximum thread engagement
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM A574 standards
• Black oxide finish provides surface protection and reduces light reflection
• 3/8-inch hex drive accepts standard hex keys and socket drivers

Compatibility

Designed as an OEM-style replacement or standard-service hex socket cap screw for any application requiring a 1/2-20 UNF fully threaded alloy steel socket cap screw with a 1-1/8-inch length under head.

Installation Notes

Installation requires a calibrated 3/8-inch hex key or T-handle Allen driver. Always verify that the mating tapped hole meets the 1/2-20 UNF specification before installation. Power down or de-energize any equipment before performing fastener service on live assemblies. Follow applicable torque specifications from the equipment manufacturer or relevant ASME guidelines for the fastener size and grade.