Value Collection 40258 Hex Socket Cap Screw 1/2-20 Unf

Product Description

The VALUE COLLECTION 40258 is a hex socket cap screw designed for applications requiring a secure, high-strength threaded fastener. Sized at 1/2-20 UNF with a 1-1/2 inch length under head, this screw is fully threaded and driven with a 3/8 inch hex key. Constructed from alloy steel and finished with a black oxide coating, it delivers corrosion resistance and surface hardness suited for demanding mechanical and industrial environments. The ASME/ANSI B18.3 and ASTM A574 standards govern its dimensional and mechanical requirements, making it a reliable choice for precision assemblies where thread fit and tensile strength matter.

This fastener is appropriate for use in mechanical assemblies, machine frames, tooling fixtures, and industrial equipment where a recessed-drive cap screw is specified. The 1/2-20 UNF fine thread pitch is common in applications requiring tighter thread engagement and reduced axial movement under vibration. Trades including millwrights, mechanical contractors, and equipment maintenance technicians regularly use this style of fastener during fabrication, repair, and installation work. Sold individually with a minimum order quantity of 25 pieces.

Key Features

• 1/2-20 UNF fine thread for tight thread engagement and vibration resistance
• 1-1/2 inch length under head, fully threaded
• 3/8 inch hex (Allen) drive socket
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• 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 specifying a 1/2-20 UNF fully threaded socket head cap screw with a 1-1/2 inch length under head.

Installation Notes

Install using a 3/8 inch hex key or socket drive rated for the fastener size. Ensure mating threads are clean and free of debris before installation. Follow applicable torque specifications from the equipment manufacturer or relevant ASME standards for alloy steel fasteners of this size and grade. Black oxide finish is a mild coating and is not a substitute for additional corrosion protection in wet or outdoor environments.