Value Collection 581555PR Hex Socket Cap Screw 1/2-13 Unc

Product Description

The VALUE COLLECTION 581555PR is a hex socket cap screw designed for high-strength fastening applications in structural, mechanical, and industrial assemblies. The fastener measures 7-1/2 inches in length under head with a 1/2-13 UNC thread and is partially threaded along the shank. Drive engagement is through a 3/8 inch hex socket. Constructed from alloy steel with a black oxide coating, the screw offers solid tensile strength and moderate corrosion resistance in controlled environments. It meets ASME/ANSI B18.3 and ASTM A574 dimensional and mechanical standards. Machinists, maintenance mechanics, and industrial assembly technicians typically source this fastener for heavy-duty bolted connections.

This screw suits a wide range of industrial and commercial applications where a recessed hex drive is required for torque access in tight clearances. The partial thread shank provides a smooth grip zone useful for precision fit bolted joints, jigs, fixtures, and machine frames. It is appropriate for use in steel-on-steel assemblies where alignment and clamping load distribution matter. The black oxide finish keeps surface reflectivity low, which is useful in tooling and machinery environments.

Key Features

• 1/2-13 UNC thread for broad compatibility with standard inch-series tapped holes
• 7-1/2 inch length under head accommodates deep stack-up or extended reach applications
• Partially threaded shank provides a smooth grip section for precision alignment
• 3/8 inch hex drive allows use of standard hex keys and socket drivers
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide coating provides a low-reflectivity finish with mild corrosion resistance

Compatibility

Designed as a standard inch-series hex socket cap screw for use in any 1/2-13 UNC tapped hole requiring a 7-1/2 inch partially threaded fastener conforming to ASME/ANSI B18.3 and ASTM A574.

Installation Notes

Installation is performed with a 3/8 inch hex key or socket driver rated for the required torque load. Ensure the mating tapped hole is clean and free of debris before installation. Power down or de-energize any equipment before fastening components in live machinery. Follow applicable ASME or facility torque specifications for the joint material and thread class in use.