81238 -M INA cylindrical roller thrust bearing

INA 81238-M Cylindrical Roller Thrust Bearing (Brass Cage)

The INA 81238-M is a premium thrust bearing designed to handle exceptionally high axial loads in a single direction. The assembly consists of a high-precision cylindrical roller and cage assembly, paired with shaft and housing washers. The standout feature of this model is the solid brass cage (M), which provides superior roller guidance, high vibration resistance, and operational stability at elevated temperatures. Its rigid construction minimizes axial deflection, which is critical for heavy-duty industrial machinery.

Application

• Heavy Industry: Planetary gearboxes, rolling mills, and high-pressure hydraulic presses.
• Energy Sector: Generators, turbines, and drilling equipment (rotary tables).
• Metalworking: Spindles for large-scale machine tools requiring high axial stiffness.
• Lifting Technology: Crane hooks and slewing rings subjected to heavy vertical forces.
• Maritime Industry: Ship propulsion systems and steering mechanisms.

Technical Specification

• Manufacturer: INA (Schaeffler Group - Germany).
• Designation: 81238-M.
• Dimensions: 190 mm (ID) × 270 mm (OD) × 62 mm (Height).
• Cage Type: M – Solid brass cage, roller-guided.
• Load Capability: Unidirectional axial loads only.
• Material: Heat-treated steel with high metallurgical purity.

Features and Benefits

• Extreme Axial Load Capacity: Cylindrical geometry offers a much larger contact area than ball thrust bearings.
• Brass Cage (M): Enhances lubrication, reduces friction, and extends service life in harsh environments.
• High System Rigidity: Minimal deformation under full load ensures precise machine operation.
• Separable Design: Allows for independent mounting of the roller assembly and washers, simplifying installation in large machinery.
• Premium Quality: Manufactured to Schaeffler’s highest standards for maximum fatigue life.

Why Choose This Product

Opting for the INA 81238-M bearing is an investment in the operational reliability of strategic equipment. In applications with a 190 mm shaft diameter, unplanned downtime results in staggering costs. The solid brass cage ensures the bearing is more resilient to lubrication issues and dissipates heat more effectively than steel-caged versions. This is a field-proven solution that ensures continuity in the most demanding industrial sectors.