Value Collection 40257 Hex Socket Cap Screw 1/2-20 Unf

Product Description

The VALUE COLLECTION 40257 is a hex socket cap screw designed for high-strength fastening in mechanical, industrial, and structural assemblies. It features a 1/2-20 UNF thread size and measures 1-1/4 inches in length under the head. The screw is fully threaded and driven with a 3/8-inch hex key. Constructed from alloy steel with a black oxide finish, it delivers solid corrosion resistance and surface hardness. This type of fastener is commonly installed by machinists, maintenance technicians, and assembly professionals working in manufacturing, equipment repair, and general industrial applications.

This screw is suited for use in machinery, fixtures, jigs, and mechanical assemblies where a flush or recessed fastener head is required. The 1/2-20 UNF thread pitch is a fine-thread designation, making it appropriate for applications that require tighter thread engagement and reduced vibration loosening compared to coarse-thread alternatives. The black oxide coating provides mild corrosion resistance suitable for indoor and controlled-environment use. This fastener meets ASME/ANSI B18.3 and ASTM A574 standards, confirming it is manufactured to recognized dimensional and mechanical property requirements.

Key Features

• 1/2-20 UNF fine thread for strong thread engagement and vibration resistance
• Fully threaded shaft along the 1-1/4-inch length under head
• 3/8-inch hex drive for use with standard hex keys or Allen wrenches
• Alloy steel construction for high tensile strength
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Meets ASME/ANSI B18.3 and ASTM A574 standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw suitable for mechanical assemblies and industrial equipment that accept a 1/2-20 UNF fully threaded fastener with a 3/8-inch hex drive.

Installation Notes

Install using a 3/8-inch hex key or Allen driver sized to the socket recess. Ensure the mating tapped hole is clean and free of debris before threading. Apply thread-locking compound if required by the application to prevent loosening from vibration. Follow applicable torque specifications from your engineering documentation or fastener reference standards, as no torque value is specified for this SKU.