Bridgeport 12060099 Square Key Milling Machine

Product Description

The BRIDGEPORT 12060099 is a square key designed as a precision drive component for milling machine assemblies. Square keys transmit torque between a shaft and a mating hub or gear, preventing rotational slippage under load. This key measures 0.188 inches wide by 2.50 inches in length and fits within the 2J-Head Top Housing assembly. It is a direct OEM-style replacement part intended for installation by qualified machine tool technicians or millwrights performing scheduled maintenance or component rebuilds on Bridgeport-style vertical milling machines.

This square key is specified for use with I Series Milling Machines and fits the 2J-Head Top Housing. It is a single-piece replacement hardware item commonly replaced during spindle drive service, head disassembly, or when keyway wear is found during preventive maintenance. The part ships as a quantity of one and is appropriate for both shop maintenance programs and field service repairs.

Key Features

• Square key profile ensures positive torque transmission between shaft and hub
• Dimensions of 0.188 x 2.50 inches matched to OEM 2J-Head Top Housing keyway specifications
• Single-piece unit sold individually, no trimming or modification required for listed application
• Direct OEM replacement part number for I Series Milling Machines

Compatibility

Specified for use with BRIDGEPORT I Series Milling Machines, specifically the 2J-Head Top Housing assembly.

Installation Notes

Installation should be performed by a qualified machinist or millwright with the machine fully powered down, locked out, and tagged out per OSHA lockout/tagout procedures. Inspect the keyway in both the shaft and hub for wear or damage before installing the replacement key. Use a soft-faced mallet or press to seat the key without deforming it, and verify proper fit and clearance before reassembling the head assembly.