Gibraltar 831705 Shoulder Screw 3/4 in Black Oxide Steel

Product Description

The GIBRALTAR 831705 is a steel shoulder screw with a 3/4-inch shoulder diameter and a 1/2-inch shoulder length, threaded 5/8-11 UNC. It features a hex socket drive requiring a 3/8-inch drive tool, with a 1-inch head diameter and a 1/2-inch head height. Finished in black oxide for mild corrosion resistance, this screw is machined from 1137 steel, a free-machining grade known for good strength and machinability. Shoulder screws of this type serve as precision pivot points, linear motion guides, and fixed shafts in mechanical assemblies. Machinists, maintenance technicians, and industrial equipment assemblers are the typical installers.

This shoulder screw is suited for use in jigs, fixtures, die sets, and general industrial machinery where a precise, hardened bearing surface is required. The unthreaded shoulder provides a controlled-diameter shaft for bearings, bushings, or linkages to ride against, while the threaded portion anchors the fastener into the parent material. It is commonly used in manufacturing facilities, maintenance shops, and production equipment environments where precise motion control and repeatable positioning are critical.

Key Features

• 3/4-inch shoulder diameter with 0.7500-inch decimal tolerance for precise fit in bored holes
• 1/2-inch shoulder length provides a defined bearing surface for bushings or rotating components
• 5/8-11 UNC thread standard for secure anchoring in steel or aluminum housings
• Black oxide finish provides mild corrosion resistance and reduces light reflection in assembly environments
• Hex socket drive accepts a 3/8-inch hex key for installation in confined or recessed locations
• 1137 steel material grade offers good machinability and adequate tensile strength for industrial fastening applications

Compatibility

Designed as a standard shoulder screw for use in industrial machinery, jigs, fixtures, and die components requiring a 3/4-inch shoulder diameter and 5/8-11 UNC thread engagement.

Installation Notes

Installation is typically performed by machinists or maintenance technicians using a 3/8-inch hex key or Allen wrench. The mating bore should be sized to the shoulder diameter for proper fit and function. Ensure the receiving threaded hole is clean and free of debris before installation. Do not exceed the thread engagement depth appropriate for the material being fastened into, and avoid over-torquing, which can damage the 1137 steel threads or the mating material.