Gibraltar 646400-G Press Fit Rest Button 3/8 in Od

Product Description

The GIBRALTAR 646400-G is a press fit rest button designed for use in precision tooling, fixturing, and workholding applications. This ground press fit button features a 3/8 inch outside diameter, a 5/8 inch overall length, and a 1/4 inch head height. Constructed from low carbon steel with a black oxide finish, it resists corrosion in light-duty industrial environments. The ground press fit design ensures tight, accurate seating when driven into a mating bore, making it a reliable reference point or rest surface in jigs, dies, and fixtures. The pin diameter of 0.1885 inches provides consistent, repeatable locating performance.

This rest button is suited for machine shops, toolrooms, and production floor applications where precise workpiece support and location are required. It installs into a prepared bore in a fixture plate, die set, or tooling block. The ground finish ensures dimensional accuracy at the seating surface, which is critical when used as a datum or support rest in close-tolerance setups. Typical users include toolmakers, machinists, and fixture builders working with jigs, molds, and precision assembly fixtures.

Key Features

• Press fit retention secures button firmly in a drilled and reamed bore without fasteners
• Ground finish on seating surface ensures dimensional consistency and repeatability
• Low carbon steel construction balances machinability with adequate hardness for tooling use
• Black oxide finish provides light corrosion resistance and reduces surface glare
• 0.1885 inch pin diameter for accurate bore alignment and installation
• Compact profile with 1/4 inch head height minimizes interference in tight fixture layouts

Compatibility

Designed as a standard press fit rest button for use in tooling fixtures, jig plates, die sets, and workholding assemblies requiring a ground locating or support surface.

Installation Notes

Installation is performed by toolmakers or machinists using a press or arbor press to drive the button into a precision-reamed bore sized to the pin diameter. The bore should be prepared to the appropriate interference fit tolerance before installation. Do not hammer the button in freehand, as this may damage the ground head surface or misalign the button. Always confirm bore depth and diameter before pressing to avoid damage to the fixture plate.