Gibraltar 646515-G Press Fit Rest Button 1-1/4 in Od

Product Description

The GIBRALTAR 646515-G is a press fit rest button designed for precision workholding and fixture applications in industrial and manufacturing environments. Constructed from low carbon steel with a ground finish and black oxide coating, this button provides a stable, repeatable rest surface for locating workpieces on jigs, fixtures, and machine tools. It features a 1-1/4 inch outside diameter, a 5/8 inch head height, and an overall length of approximately 1-1/2 inches. The ground surface ensures flatness and dimensional accuracy, making it suitable for close-tolerance setups. Installation is handled by machinists, toolmakers, and fixture builders working in precision machining operations.

This press fit rest button is used in jig and fixture construction where a hardened or ground locating surface is required to support and position parts during machining or inspection. The press fit design allows the button to be driven or pressed directly into a drilled hole in a fixture plate or tooling body without additional fasteners. The black oxide coating provides a degree of corrosion resistance for shop-floor conditions. Typical applications include milling fixtures, inspection fixtures, and assembly tooling across metalworking, aerospace, and general manufacturing environments.

Key Features

• Ground press fit design for accurate, repeatable workpiece location
• Low carbon steel construction with black oxide coating for corrosion resistance
• 1-1/4 inch outside diameter with 5/8 inch head height
• 0.751 inch pin diameter for precise press fit into drilled tooling holes
• Overall length of approximately 1-1/2 inches
• No fasteners required — presses directly into the fixture body

Compatibility

Designed as a standard press fit rest button for use in jig and fixture plates drilled to accept a 0.751 inch nominal pin diameter. Consult your fixture design specifications to confirm hole size and fit class before installation.

Installation Notes

Press fit rest buttons are typically installed by toolmakers or machinists using an arbor press or hydraulic press. Ensure the receiving hole is drilled and reamed to the correct diameter to achieve the intended press fit before driving the button. Do not hammer directly on the ground face of the button, as this can damage the surface finish and compromise locating accuracy. Removal requires a suitable punch applied to the underside of the pin through a clearance hole in the fixture plate.