NSK 81105M Cylindrical Roller Thrust Bearings 25x42x11mm
The NSK 81105M is a premium single-row, single-direction cylindrical roller thrust bearing produced by NSK, a world-leading manufacturer of precision bearings and mechatronics solutions. Engineered for heavy axial load applications with limited axial installation space, this bearing outperforms thrust ball bearings in load-carrying capacity while maintaining exceptional operational stability.
The NSK 81105M is a premium single-row, single-direction cylindrical roller thrust bearing produced by NSK, a world-leading manufacturer of precision bearings and mechatronics solutions. Engineered for heavy axial load applications with limited axial installation space, this bearing outperforms thrust ball bearings in load-carrying capacity while maintaining exceptional operational stability. It features a fully separable three-component design: an axial cylindrical roller and cage assembly (K81105M), a shaft locating washer (WS81105), and a housing locating washer (GS81105). This structure simplifies mounting, dismounting and maintenance, making it a reliable choice for demanding industrial environments.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Bearing Type | Single Row Cylindrical Roller Thrust Bearing, Single Direction | - |
| Inner Diameter (d) | 25 | mm |
| Outer Diameter (D) | 42 | mm |
| Height/Width (H/B) | 11 | mm |
| Cage Material | Machined brass - designated by suffix "M" | - |
| Dynamic Load Rating (Cₐ) | 26 | kN |
| Static Load Rating (C₀ₐ) | 72 | kN |
| Reference Speed (nr) | 3,000 | rpm |
| Limiting Speed (nlim) | 5,600 | rpm |
| Temperature Range | -30 to +150 °C | - |
| Closure Type | Open | - |
| Bore Type | Parallel | - |
Design Features & Benefits
- Brass Cage Advantage: The "M" suffix indicates a high-strength machined brass cage, which delivers superior thermal conductivity, wear resistance and dimensional stability compared to polyamide cages. It is suitable for high-speed, high-temperature or heavy-shock-load working conditions.
- Separable Construction: All three core components can be installed and disassembled independently, enabling flexible inventory management and convenient on-site maintenance. Component interchangeability within the same series further reduces operational costs.
- Heavy Axial Load Capacity: Optimized roller profile and raceway design effectively distribute loads, allowing the bearing to withstand extreme single-direction axial loads and occasional impact loads without deformation.
- Space-Saving Design: Compact axial dimension (11mm) maximizes load performance in limited installation space, ideal for downsized industrial equipment.
- Precision & Durability: NSK’s advanced grinding and heat treatment technologies ensure tight dimensional tolerances and uniform hardness of bearing components, extending service life and reducing downtime.
Suffix Explanation
- 811: Series code for NSK single-row cylindrical roller thrust bearings, representing the basic structural design for heavy axial load scenarios.
- 05: Size code corresponding to an inner diameter of 25 mm, complying with international dimensional standards for this bearing series.
- M: Designates a machined brass cage, which is preferred for applications requiring high temperature resistance and mechanical strength.
Typical Applications
The NSK 81105M is widely applied in various industrial fields, including:
- Gearboxes, reducers and power transmission systems
- High-precision machine tool spindles and CNC machining centers
- Hydraulic pumps, motors and compressors under heavy load
- Metal forming presses, stamping machines and forging equipment
- Conveyor systems and material handling machinery
- Agricultural machinery and construction equipment
- Automotive powertrain components and industrial robots
Installation Notes
To ensure optimal performance and service life, follow these guidelines:
- Ensure precise alignment of the shaft washer, housing washer and roller-cage assembly during installation to avoid misalignment-induced premature wear.
- Select lubricants matching the operating temperature, speed and load; regular lubrication is recommended for continuous high-speed operation.
- Use NSK-specified mounting tools to prevent scratches or damage to the bearing’s precision raceways and rollers.
- Maintain the designed axial clearance or preload according to the equipment’s operational requirements.
- Do not apply radial loads— this bearing is engineered exclusively for axial load support.
- Comply with NSK’s official mounting and dismounting procedures for separable cylindrical roller thrust bearings.
The NSK 81105M integrates NSK’s precision engineering expertise, offering a perfect combination of heavy load capacity, high temperature resistance and operational reliability, making it a top choice for critical axial load applications across industries.
