Value Collection 581557PR Hex Socket Cap Screw 1/2-13 Unc

Product Description

The VALUE COLLECTION 581557PR is a hex socket cap screw designed for high-strength fastening applications across industrial, mechanical, and structural assemblies. It features a 1/2-13 UNC thread size and measures 8-1/2 inches in length under the head. The screw is partially threaded and driven with a 3/8-inch hex key. Constructed from alloy steel with a black oxide finish, this fastener delivers solid corrosion resistance and surface hardness suited to demanding environments. It conforms to ASME/ANSI B18.3 and ASTM A574 standards, making it appropriate for load-bearing and precision fastening work where dimensional consistency and tensile strength matter.

This cap screw is suited for general industrial maintenance, machine assembly, tooling fixtures, and structural fabrication. The 1/2-13 UNC coarse thread pitch is a common standard in North American manufacturing, making this fastener a practical replacement or stock item for maintenance shops, fabrication facilities, and production lines. Its longer 8-1/2-inch under-head length makes it appropriate for thicker stack assemblies or deep-reach fastening situations where shorter fasteners are insufficient.

Key Features

• 1/2-13 UNC coarse thread for compatibility with standard North American tapped holes
• 8-1/2 inch length under head for deep-reach and thick-stack fastening
• Partially threaded shank provides a bearing surface for shear-load applications
• 3/8-inch hex socket drive for use with standard hex keys and socket tooling
• Alloy steel construction meets ASTM A574 tensile strength requirements
• Black oxide finish provides mild corrosion resistance and reduces light reflection

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw suitable for any application requiring a 1/2-13 UNC partially threaded fastener with an 8-1/2 inch under-head length.

Installation Notes

Install using a 3/8-inch hex key or socket driver. Ensure the tapped hole is clean and free of debris before threading to avoid cross-threading or galling. Apply appropriate thread lubricant or anti-seize compound when required by the application or ambient conditions. Power down or de-energize any equipment before performing fastener replacement on mechanical assemblies.