Holo-krome 72126 Hex Socket Cap Screw 5/16-18 Unc Alloy Steel

Product Description

The HOLO-KROME 72126 is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, industrial equipment, and structural connections. It features a 5/16-18 UNC thread and a 7/8-inch length under the head, with full threading along the shank. The drive is a 1/4-inch internal hex socket, suited for Allen key or hex bit installation. Constructed from alloy steel with a black oxide finish, this fastener delivers strong tensile performance and moderate corrosion resistance in controlled environments. It conforms to ASME B18.3 and ASTM A574 standards, making it appropriate for load-bearing fastener applications where dimensional and mechanical compliance is required.

This screw is used across a wide range of industrial and mechanical service contexts, including HVAC equipment assembly, pump and motor mounting, panel fabrication, and general trade maintenance. The 5/16-18 UNC thread is a common coarse-thread size found in steel assemblies throughout residential and commercial mechanical systems. The black oxide finish is typical for interior or protected exterior applications where moderate surface protection is acceptable. This item is sold in multiples of 100 units, making it practical for service shops and contractors stocking standard fastener sizes for recurring repair and installation work.

Key Features

• 5/16-18 UNC coarse thread for broad compatibility with standard tapped holes
• 7/8-inch length under head, fully threaded shank
• 1/4-inch internal hex socket drive for Allen key or hex bit installation
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides moderate corrosion resistance in dry or protected environments
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application requiring a 5/16-18 UNC fully threaded fastener with a 1/4-inch hex drive and 7/8-inch length under head.

Installation Notes

Installation is performed with a 1/4-inch hex key or hex bit driver. Confirm thread engagement and hole depth before torquing to avoid stripping alloy steel threads in softer base materials. De-energize and lock out any equipment before fastener removal or replacement in live mechanical systems. Follow applicable torque guidelines from the equipment manufacturer or relevant ASME standards for 5/16-18 alloy steel cap screws.