Holo-krome 72364 Hex Socket Cap Screw 7/8-9 Unc Alloy Steel

Product Description

The HOLO-KROME 72364 is a hex socket cap screw designed for high-strength bolted assemblies in industrial, mechanical, and trade applications. It features a 7/8-9 UNC thread and measures 7 inches in length under the head, with partial threading along the shank. The 3/4-inch hex drive socket accepts a standard hex key or Allen-type driver. Constructed from alloy steel with a black oxide finish, this fastener delivers the tensile strength and corrosion resistance required for demanding installations. It conforms to ASME B18.3 and ASTM A574 standards, which specify dimensional and mechanical property requirements for socket cap screws.

This screw is suited for use in structural mechanical assemblies, machine frames, equipment mounting, and similar industrial applications where a flush or low-profile head and high clamp load are required. The partially threaded shank provides a smooth bearing surface in clearance holes, making it appropriate for applications where shear load is a factor alongside tensile load. It is commonly installed by millwrights, maintenance mechanics, pipefitters, and industrial contractors working on heavy equipment, pumps, compressors, and structural steel assemblies.

Key Features

• 7/8-9 UNC thread form for compatibility with standard inch-series tapped holes
• 7-inch length under head with partial threading for shear-bearing applications
• 3/4-inch hex socket drive for high-torque installation with a hex key or driver
• Alloy steel construction meeting ASTM A574 mechanical property requirements
• Black oxide finish provides mild corrosion resistance and reduced light reflection
• Conforms to ASME B18.3 dimensional standards for socket cap screws

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application requiring a 7/8-9 UNC partially threaded fastener with a 3/4-inch hex drive.

Installation Notes

Installation is performed with a 3/4-inch hex key or socket-style Allen driver; ensure the drive tool is fully seated before applying torque to avoid rounding the socket. De-energize and lock out all equipment before accessing bolted assemblies per applicable OSHA lockout/tagout procedures. Inspect the tapped hole for thread damage and clean threads before installation. Do not substitute a lower-grade fastener in applications specified for ASTM A574 socket cap screws.