Bridgeport 11180254 Ball Bearing Top Housing Assembly

Product Description

The BRIDGEPORT 11180254 is a replacement ball bearing designed for use in variable speed top housing assemblies on Bridgeport milling machines. This bearing supports the spindle drive system within the top housing, maintaining proper rotational alignment and load transfer during milling operations. It is a direct-fit OEM-style replacement component intended for installation by qualified machine tool technicians or maintenance personnel performing scheduled or corrective maintenance on affected mill models. Proper bearing condition is critical to spindle performance, surface finish quality, and long-term machine accuracy.

This ball bearing is specified for 1.5 to 2.0 HP B Series variable speed milling machines. It fits within the variable speed top housing assembly and is also noted for compatibility with I Series milling machines. Typical installation occurs during top housing rebuilds, bearing replacement intervals, or after bearing failure diagnosis. This part is sold individually as a single unit.

Key Features

• Direct-fit replacement for variable speed top housing assemblies on B Series mills
• Compatible with 1.5 to 2.0 HP B Series and I Series Bridgeport milling machines
• Supports spindle drive rotational loads within the top housing
• Sold as a single bearing unit, no additional quantity required

Compatibility

Specified for use with 1.5 to 2.0 HP B Series variable speed milling machines and I Series milling machines. Fits within the variable speed top housing assembly on applicable models.

Installation Notes

Installation should be performed by a qualified machine tool technician. Disconnect and lock out all electrical power to the milling machine before disassembling the top housing. Proper bearing installation typically requires a bearing press or suitable driver to avoid damage to races — do not strike bearings directly with a hammer. Refer to the Bridgeport service manual for top housing disassembly and reassembly procedures specific to B Series and I Series machines.