NKXR40 -Z NKE needle roller bearing

NKE NKXR40-Z Combined Needle Roller Bearing (Locating Unit with Cover)

The NKE NKXR40-Z is a high-performance combined unit integrating a radial needle roller bearing with a thrust cylindrical roller assembly, featuring an integrated protective cover (-Z). This design allows for the simultaneous handling of massive radial forces and significant axial loads acting in one direction. The steel cover on the thrust section not only protects the rolling elements from contaminants but also acts as an efficient gap seal to retain lubricant within the raceways. This model runs directly on a hardened shaft, enabling maximum miniaturization while maintaining extreme rigidity.

Application

• CNC Machine Tools: Precision guidance for spindles and drive shafts operating at high speed cycles.
• Automation & Robotics: Compact drives and joints requiring grease retention against centrifugal forces.
• High-Pressure Pumps: Bearing arrangements for crankshafts and connecting rods under complex loads.
• Automotive Engineering: Transmissions and control mechanisms in specialized vehicles.
• Vertical Spindles: The -Z cover prevents lubricant leakage from the thrust section due to gravity.

Technical Specification

• Manufacturer: NKE Bearings (Austria).
• Designation: NKXR40-Z.
• Dimensions: 40 mm (ID under needles) × 54 mm (Cover OD) × 32 mm (Total width).
• Type: Combined bearing (radial needle + shielded thrust cylindrical roller).
• Protection: Integrated steel thrust cover (-Z).
• Cages: Precision-guided steel cages for dynamic stability.

Features and Benefits

• Lubricant Retention (-Z): The integrated cover extends maintenance intervals and prevents grease splattering at high speeds.
• Extreme Axial Rigidity: Cylindrical rollers in the thrust section offer uncompromising resistance to deflection, superior to ball-type versions.
• Space Efficiency: Eliminates the need for separate housings for radial and thrust bearings.
• Austrian Precision: NKE manufacturing guarantees high running accuracy, reducing machine vibration and noise.
• Inner-Ringless Operation: Allows for a thicker, stiffer shaft within a given housing diameter.

Why Choose This Product

By choosing the NKE NKXR40-Z, you are investing in a "premium-protection" solution. In 40 mm applications where the shaft operates under heavy loads and high speeds, the additional thrust section cover is vital for the system's longevity. This bearing combines Austrian reliability with engineering foresight, limiting the risk of failures caused by lubrication loss or raceway contamination.