Holo-krome 720003985 Hex Socket Cap Screw 1-8 Unc

Product Description

The HOLO-KROME 720003985 is a hex socket cap screw designed for high-strength fastening applications in industrial and mechanical assemblies. This screw features a 1-8 UNC thread size with an 11-inch length under the head and a 3/4-inch hex drive socket. It is partially threaded and manufactured from alloy steel with a black oxide finish for improved corrosion resistance in moderate environments. The part meets ASME B18.3 and ASTM A574 standards, making it suitable for demanding structural and mechanical fastening work. It is installed by machinists, millwrights, and maintenance technicians working on heavy equipment, fabricated structures, or industrial machinery.

This screw is well suited for applications requiring a strong, torque-resistant fastener in carbon or alloy steel assemblies. The 1-8 UNC coarse thread provides reliable engagement in standard tapped holes, and the partially threaded shank improves shear strength across joint interfaces. Typical installations include machine frames, industrial equipment mounting, and structural steel assemblies where high clamping force is required. The black oxide coating reduces light reflection and offers mild protection against surface oxidation in indoor or semi-sheltered environments.

Key Features

• 1-8 UNC coarse thread for reliable engagement in standard tapped holes
• 11-inch length under the head accommodates thick stack-up assemblies
• 3/4-inch hex socket drive for high-torque installation with standard hex keys or drive tools
• Partially threaded shank improves shear strength at the joint interface
• Alloy steel construction meets ASTM A574 for high-strength fastener applications
• Black oxide finish provides mild corrosion resistance and reduces surface glare

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in 1-8 UNC tapped holes in industrial and mechanical assemblies requiring a high-strength alloy steel fastener.

Installation Notes

Installation should be performed by qualified machinists or maintenance technicians familiar with high-strength fastener practices. Use a calibrated torque wrench with the appropriate 3/4-inch hex key or socket bit to achieve proper clamp load without yielding the fastener. Ensure the mating tapped hole is clean, free of debris, and meets the thread specification before installation. Follow applicable industry standards and equipment manufacturer guidelines for torque requirements specific to the joint design.