Holo-krome 720003964 Hex Socket Cap Screw 1-8 Unc

Product Description

The HOLO-KROME 720003964 is a partially threaded hex socket cap screw designed for high-strength fastening applications in industrial and mechanical assemblies. It features a 1-8 UNC thread size and a 9-inch length under head, making it suited for deep through-bolt and structural clamping applications. The alloy steel construction with a black oxide finish provides corrosion resistance and meets ASME B18.3 and ASTM A574 standards. The 3/4-inch hex drive socket interface allows high torque application with standard hex keys or socket drivers used by maintenance technicians and industrial mechanics.

This cap screw is used in heavy-duty mechanical and structural assemblies where a recessed drive head and high clamp load are required. Typical applications include machinery frames, industrial equipment mounting, and fabricated steel structures. The partial threading engages the full clamping length efficiently while the unthreaded shank provides shear resistance in close-tolerance bores. It is commonly installed by millwrights, maintenance mechanics, and industrial assemblers working on equipment that demands high-tensile fasteners.

Key Features

• 1-8 UNC thread for compatibility with standard inch-series tapped holes
• 9-inch length under head for deep fastening and long-grip applications
• Partially threaded shank provides shear resistance in precision bores
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish offers moderate corrosion resistance and reduces light reflection
• 3/4-inch hex socket drive supports high-torque installation with standard tooling

Compatibility

Designed as a high-strength inch-series socket cap screw conforming to ASME B18.3 and ASTM A574 standards, suitable for use in any 1-8 UNC tapped hole requiring a socket head cap screw with a 9-inch grip length.

Installation Notes

Installation should be performed by qualified mechanics or industrial assemblers using a calibrated torque wrench and a 3/4-inch hex key or socket. De-energize and lock out all equipment before servicing any fastened assembly. Verify thread engagement depth and hole alignment before final torque. Do not substitute lubricants or thread compounds without confirming compatibility with the base material and torque specification for the application.