Holo-krome 720003986 Hex Socket Cap Screw 1-8 Unc

Product Description

The HOLO-KROME 720003986 is a hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. It features a 1-8 UNC thread size with a 12-inch length under the head, making it well suited for deep-reach clamping situations where standard-length fasteners fall short. The screw is manufactured from alloy steel with a black oxide finish for corrosion resistance and reduced light reflection in service environments. Drive is a 3/4-inch internal hex socket. This fastener meets ASME B18.3 and ASTM A574 standards, confirming its suitability for load-bearing and precision-tolerance applications. Installed by millwrights, industrial maintenance technicians, and mechanical assemblers.

This socket cap screw is used in heavy equipment assembly, machine frames, fixture building, and general industrial fastening wherever a recessed-drive high-tensile fastener is required. The partial threading and 12-inch body length make it appropriate for through-bolt applications and thick-stock assemblies where engagement depth and shank clearance both matter. It is sold individually, making it accessible for maintenance replacement as well as production use.

Key Features

• 1-8 UNC thread provides coarse-pitch engagement suitable for steel and iron tapped holes
• 12-inch length under head accommodates deep-stack or through-bolt configurations
• Partially threaded shank allows for shear-load bearing along the unthreaded body
• Alloy steel construction meets ASTM A574 mechanical requirements for socket cap screws
• Black oxide coating reduces surface corrosion and minimizes galling during installation
• 3/4-inch hex socket drive accepts standard hex keys and socket tooling

Compatibility

Designed as an OEM-style and aftermarket replacement hex socket cap screw for industrial machinery, structural fixtures, and mechanical assemblies requiring a 1-8 UNC coarse-thread fastener with a 12-inch length under head.

Installation Notes

Installation should be performed by a qualified mechanic or millwright using a properly rated 3/4-inch hex key or socket driver. De-energize and lock out all equipment before fastener replacement or assembly work per applicable OSHA lockout/tagout procedures. Do not reuse fasteners that show thread damage, corrosion, or deformation. Torque to the value specified in the equipment manufacturer's assembly documentation for ASTM A574 socket cap screws of this thread size.