Holo-krome 72346 Hex Socket Cap Screw 7/8-9 Unc Alloy Steel

Product Description

The HOLO-KROME 72346 is a hex socket cap screw designed for high-strength fastening in mechanical assemblies, industrial equipment, and structural connections. It carries a 7/8-9 UNC thread and measures 3 inches in length under the head with full threading along the entire shank. The drive is a 3/4-inch hex socket, which accepts a standard Allen or hex key drive tool. Constructed from alloy steel with a black oxide finish, the fastener delivers high tensile strength and moderate corrosion resistance in protected or lightly exposed environments. It meets ASME B18.3 and ASTM A574 standards. Licensed tradespeople and industrial maintenance technicians are the primary installers.

This cap screw is suited for use in heavy equipment, machine tool frames, jigs, fixtures, and general mechanical assemblies where a recessed drive head and high clamp load are required. The fully threaded shank allows engagement along the full 3-inch length, making it appropriate for through-bolting or threading into blind holes with adequate depth. It is sold as a single unit with a minimum order quantity of one.

Key Features

• 7/8-9 UNC thread form for standard unified coarse-pitch applications
• 3 inches length under head, fully threaded shank
• 3/4-inch hex socket drive accepts standard hex key and torque wrench tooling
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish provides mild corrosion resistance and reduces light glare on the fastener head
• 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 7/8-9 UNC fully threaded fastener with a 3-inch length under head.

Installation Notes

Installation should be performed by a qualified mechanic or maintenance technician familiar with torque specifications for alloy steel fasteners at this thread size. Use a properly sized 3/4-inch hex key or socket driver; an undersized driver will damage the socket recess. De-energize and lock out any equipment before fastener installation or removal. Verify thread engagement depth and hole condition before applying final torque.