Holo-krome 72132 Hex Socket Cap Screw 5/16-18 Unc Alloy Steel

Product Description

The HOLO-KROME 72132 is a hex socket cap screw designed for high-strength fastening applications where a recessed drive and a clean, corrosion-resistant finish are required. Manufactured from alloy steel with a black oxide coating, this screw carries a 5/16-18 UNC thread and a 1-1/2 inch length under head. The 1/4 inch hex socket drive accepts a standard hex key or Allen driver. Full threading runs the entire 1-1/2 inch shank length, maximizing thread engagement across the fastened joint. It meets ASME B18.3 and ASTM A574 standards, making it suitable for demanding mechanical and structural assemblies installed by machinists, millwrights, and maintenance technicians.

This cap screw is used in general industrial, mechanical, and OEM assembly applications where socket drive access is preferred over external hex or Phillips head fasteners. Typical installations include machine frames, brackets, enclosures, tooling fixtures, and equipment housings. The black oxide finish provides mild corrosion resistance and reduces light reflection, making it a common choice in both shop-fabricated and production-line assemblies. This item is sold individually but carries a minimum order quantity of 100 pieces.

Key Features

• 5/16-18 UNC thread for standard inch-series fastening applications
• 1-1/2 inch length under head, fully threaded for maximum thread engagement
• Alloy steel construction meets ASTM A574 high-strength socket screw requirements
• Black oxide finish provides mild corrosion resistance and a low-glare appearance
• 1/4 inch hex socket drive compatible with standard hex keys and socket drivers
• Conforms to ASME B18.3 dimensional standard for socket cap screws

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application requiring a 5/16-18 UNC inch-series threaded fastener with a 1/4 inch hex drive.

Installation Notes

Installation is performed with a 1/4 inch hex key or T-handle Allen driver; use of a calibrated torque wrench is recommended for joints with defined clamp-load requirements. Ensure mating threads are clean and free of debris before installation. Black oxide does not substitute for a heavy-duty corrosion-resistant finish in wet or outdoor environments; consider plated or stainless alternatives for those conditions. Follow applicable mechanical codes and equipment manufacturer torque specifications when assembling structural or load-bearing joints.