Holo-krome 72350 Hex Socket Cap Screw 7/8-9 Unc

Product Description

The HOLO-KROME 72350 is a hex socket cap screw engineered for high-strength fastening applications in industrial, mechanical, and structural assemblies. Featuring a 7/8-9 UNC thread and a 3/4-inch hex drive, this cap screw is partially threaded with a 3.5-inch length under the head. The alloy steel construction is finished with a black oxide coating that provides moderate corrosion resistance and reduces light reflection in service environments. It conforms to ASME B18.3 and ASTM A574 standards, making it a recognized choice for engineers and maintenance technicians specifying high-tensile socket head fasteners.

This cap screw is suited for use in machine tool assemblies, heavy equipment, jigs and fixtures, die sets, and structural connections where a flush or recessed fastener head is required. The hex socket drive allows installation in confined spaces where a wrench or open-end tool cannot reach. Maintenance professionals, millwrights, and industrial mechanics typically install this fastener during equipment builds, retrofits, or field repairs requiring ASME B18.3-compliant hardware.

Key Features

• 7/8-9 UNC thread for compatibility with standard inch-series tapped holes
• 3.5-inch length under head with partial threading for strong clamping grip
• 3/4-inch hex socket drive for use with standard Allen or hex-key tooling
• Alloy steel construction meeting ASTM A574 high-strength requirements
• Black oxide finish for mild corrosion resistance and low-glare appearance
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as an OEM-style and replacement hex socket cap screw for applications requiring 7/8-9 UNC inch-series threading and ASME B18.3 or ASTM A574 compliance.

Installation Notes

Installation is performed by millwrights, machinists, or maintenance technicians using a 3/4-inch hex key or Allen-drive socket tool. Verify that the mating tapped hole is clean, properly sized to 7/8-9 UNC specification, and free of debris before threading. Apply thread lubricant or anti-seize compound as required by the assembly specification. Do not exceed the torque rating specified by the equipment manufacturer or applicable fastener standard.