Holo-krome 72158 Hex Socket Cap Screw 3/8-16 Unc Alloy Steel

Product Description

The HOLO-KROME 72158 is a hex socket cap screw designed for high-strength fastening applications where a clean, recessed-drive installation is required. It features a 3/8-16 UNC thread with a 1-inch length under head and is fully threaded along its entire shank. The 5/16-inch hex drive accepts a standard hex key or Allen driver. Manufactured from alloy steel with a black oxide finish, this screw delivers solid corrosion resistance in indoor and protected environments. It meets ASME B18.3 and ASTM A574 standards, making it appropriate for structural and mechanical assemblies that require a traceable fastener specification. Installers in HVAC, plumbing, electrical, and general mechanical trades use socket cap screws like this one for equipment mounting, panel attachment, and bracketing tasks.

This screw is suited for use in residential and light commercial mechanical installations where a compact, high-strength fastener is needed in tight clearances. The socket drive style allows installation with a hex key or T-handle driver in locations where a standard wrench cannot reach. The black oxide finish provides mild corrosion protection and reduces light reflection, making it a practical choice for equipment interiors, sheet metal frames, and structural brackets. It is sold in a minimum order quantity of 100 pieces per order.

Key Features

• 3/8-16 UNC thread for standard inch-series fastener applications
• 1-inch length under head, fully threaded shank
• 5/16-inch hex socket drive for recessed installation in confined spaces
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide coating provides mild corrosion resistance and low reflectivity
• Conforms to ASME B18.3 dimensional standard for socket cap screws

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for general mechanical and equipment assembly applications requiring a 3/8-16 UNC fully threaded fastener.

Installation Notes

Install using a properly sized 5/16-inch hex key, Allen driver, or T-handle to avoid rounding the socket drive. Verify thread engagement depth in the mating material meets applicable structural requirements before applying load. Always follow relevant mechanical codes and equipment manufacturer torque guidelines when securing structural or load-bearing assemblies. Inspect threads on both the screw and mating component for damage before installation.