Value Collection A997151 Hex Socket Cap Screw 1-8 Unc

Product Description

The VALUE COLLECTION A997151 is a heavy-duty hex socket cap screw engineered for high-strength fastening applications in industrial, mechanical, and structural assemblies. This screw features a 1-8 UNC thread size and measures 10.5 inches in length under the head, with partial threading along the shank. Drive engagement is through a 3/4-inch hex socket. Manufactured from alloy steel with a black oxide finish, it delivers elevated tensile strength and moderate corrosion resistance suited for controlled-environment installations. Machinists, millwrights, and maintenance technicians working on heavy equipment, presses, fixtures, and structural frames are the primary installers.

This fastener is well suited for large-bore bolted connections where high clamp load and shear resistance are required. The partial thread design keeps the unthreaded shank within the joint interface, making it appropriate for applications that demand precise shear-load transfer — common in machine bases, die sets, conveyor frames, and industrial equipment assemblies. The black oxide coating helps reduce galling during installation and provides surface protection in dry or lightly oiled environments.

Key Features

• 1-8 UNC thread form for coarse-pitch, high-strength bolted connections
• 10.5-inch length under head accommodates deep stack-up assemblies
• Partial threading preserves an unthreaded shank zone for shear load transfer
• 3/4-inch hex socket drive for high-torque installation with standard socket tooling
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM A574 standards
• Black oxide finish reduces surface friction and provides mild corrosion protection

Compatibility

Designed as a standard ASME/ANSI B18.3 and ASTM A574 compliant hex socket cap screw for use in any application requiring a 1-8 UNC coarse-thread fastener with a 3/4-inch internal hex drive.

Installation Notes

Installation requires a 3/4-inch hex key or socket driver capable of delivering appropriate torque for the joint specification. Power down and de-energize any equipment before accessing fastener locations on live machinery. Threads and mating holes should be inspected for damage, debris, and proper thread engagement before torquing. Follow the applicable equipment manufacturer torque specifications and relevant industry standards for alloy steel fasteners of this class.