Thomson Industries A4812 Closed Linear Bearing 0.25in Id

Product Description

The THOMSON INDUSTRIES A4812 is a closed-style linear ball bushing bearing designed for precise linear motion applications. With a 0.25-inch bore diameter and 0.5-inch outside diameter, this fixed-alignment bearing supports a dynamic load capacity of 19 pounds. The ball bushing design uses three ball circuits to distribute load evenly and minimize friction along the shaft. At 0.735 inches in overall length and weighing just 0.04 pounds, the A4812 is compact and suited for tight clearance installations. Steel construction delivers durability in demanding industrial environments. It is installed by mechanical technicians and automation specialists in motion control systems.

The A4812 is used in linear motion assemblies where a small-bore, closed bearing is required. Closed-style bearings are preferred when the application demands full shaft contact and protection from contamination on all sides. Typical installations include linear actuators, slide mechanisms, and precision positioning equipment found in light industrial and automation settings. The fixed alignment style means the bearing seats rigidly in the housing without self-adjusting, which is appropriate for applications with well-aligned shaft and housing geometry.

Key Features

• Closed bearing style provides full circumferential shaft contact and contamination resistance
• 19-pound dynamic load capacity suitable for light-duty linear motion applications
• Three ball circuits for smooth, distributed load transfer along the shaft
• Fixed alignment style for rigid, stable seating in precision housings
• Steel construction for strength and wear resistance
• Compact overall length of 0.735 inches fits space-constrained assemblies

Compatibility

Designed as an OEM-style replacement or direct-fit closed linear ball bushing bearing for linear motion systems using a 0.25-inch diameter shaft.

Installation Notes

Installation is typically performed by mechanical technicians or automation engineers. Disconnect and de-energize all associated machinery before removing or installing linear bearings. Press-fit bearings into the housing carefully using appropriate tooling to avoid cocking or damaging the ball circuits. Verify shaft diameter and housing bore alignment before final assembly to ensure proper bearing function and service life.