Value Collection 40256 Hex Socket Cap Screw 1/2-20 Unf

Product Description

The VALUE COLLECTION 40256 is a hex socket cap screw designed for secure, high-strength fastening in mechanical assemblies. It features a 1/2-20 UNF thread size with full threading along its 1-inch length under head, and is driven with a 3/8-inch hex key. Constructed from alloy steel with a black oxide finish, this fastener delivers corrosion resistance and meets ASME/ANSI B18.3 and ASTM A574 standards. It is suited for applications requiring precise thread engagement and a low-profile socket-drive head. Licensed tradespeople and assembly technicians working in fabrication, maintenance, and equipment repair rely on this type of fastener for consistent, repeatable torque loading.

This screw is appropriate for use in residential and commercial mechanical assemblies, machine frames, brackets, jigs, and fixtures where a flush or recessed fastener head is required. The fine UNF thread pitch provides tighter thread engagement and is preferred in applications where vibration resistance or precise adjustment is needed. It installs into standard 1/2-20 tapped holes and is compatible with common 3/8-inch hex keys and hex bit drivers.

Key Features

• 1/2-20 UNF fine thread for tight engagement and vibration resistance
• Fully threaded along the entire 1-inch length under head
• 3/8-inch hex socket drive for standard hex key or bit driver installation
• Alloy steel construction meets ASTM A574 strength requirements
• Black oxide coating provides mild corrosion resistance and reduces light reflection
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard replacement or new-installation hex socket cap screw for any 1/2-20 UNF tapped hole application requiring an ASME/ANSI B18.3 compliant alloy steel fastener.

Installation Notes

Installation is performed with a 3/8-inch hex key or socket bit driver. Ensure the mating tapped hole is clean, free of debris, and cut to 1/2-20 UNF specification before driving the fastener. Power down or de-energize any equipment before accessing fastener locations in live assemblies. Apply thread-locking compound if required by the equipment manufacturer for vibration-prone installations.