Holo-krome 72352 Hex Socket Cap Screw 7/8-9 Unc Alloy Steel

Product Description

The HOLO-KROME 72352 is a hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. It features a 7/8-9 UNC thread size with a 4-inch length under head and is partially threaded to allow proper clamping force in through-bolt configurations. The 3/4-inch hex drive requires a standard hex key or Allen wrench. Constructed from alloy steel with a black oxide finish, this fastener delivers corrosion resistance and reduced light reflection in demanding service environments. It meets ASME B18.3 and ASTM A574 standards, confirming compliance with recognized dimensional and mechanical property requirements.

This socket cap screw is suited for use in machine tool fixtures, heavy equipment, hydraulic assemblies, and other applications where a high-tensile, low-profile cap screw is required. The partial threading is appropriate for clamping applications where the shank must bear shear loads across a joint. The black oxide finish provides mild corrosion protection and is commonly specified for interior or sheltered mechanical assemblies. Installers in manufacturing, maintenance, and millwright trades routinely use this style of fastener in tight-clearance bolt patterns where a wrench cannot access a hex head.

Key Features

• 7/8-9 UNC thread size for high-load fastening in standard inch-series assemblies
• 4-inch length under head with partial threading for shear-bearing shank applications
• 3/4-inch hex socket drive for torque-efficient installation in confined spaces
• Alloy steel construction meets ASTM A574 mechanical property requirements
• Black oxide coating provides mild corrosion resistance and low-glare appearance
• Conforms to ASME B18.3 dimensional standards for socket cap screws

Compatibility

Designed as an OEM-style replacement or maintenance fastener for industrial machinery, fixtures, and structural assemblies requiring 7/8-9 UNC inch-series socket cap screws meeting ASME B18.3 and ASTM A574 specifications.

Installation Notes

Installation is typically performed by millwrights, maintenance technicians, or mechanical assemblers using a 3/4-inch hex key or Allen driver. Ensure the mating threaded hole or nut meets the required thread class and is free of debris before driving the fastener. Do not use an impact driver at full power on socket cap screws, as this can gall or strip the socket drive. Follow applicable torque specifications from the equipment manufacturer or recognized fastener engineering references for the specific joint material and thread class.