Product Overview: The NA 6903 Needle Roller Bearing
The NA 6903 is a high-performance needle roller bearing, part of our extensive NA Series of Machined Ring Bearings. With precise dimensions of 17x30x18mm (17mm bore diameter, 30mm outer diameter, and 18mm width), this bearing is engineered to handle high radial loads within a very compact design. It features a machined outer ring with flanges to guide the roller and cage assembly, and includes a removable inner ring. This makes it suitable for applications where the shaft cannot be hardened and ground as a raceway. The NA 6903 is an excellent choice for demanding industrial and automotive applications where space is limited but load capacity cannot be compromised.
Features of the NA 6903 Bearing
- High Radial Load Capacity: Its needle roller design provides a large contact area, allowing it to support significant radial forces.
- Compact and Lightweight: Offers a small cross-section, saving space and reducing weight in machinery designs.
- Includes Inner Ring: Comes with a precision-ground inner ring, allowing it to be used on standard shafts that are not hardened.
- Cage-Guided Rollers: A robust cage accurately guides the needle rollers, ensuring smooth operation and suitability for higher speeds.
- Machined Outer Ring: The solid, channel-shaped outer ring provides high rigidity and strength.
- Open Design: Facilitates easy lubrication and maintenance, contributing to a long service life.
Common Applications
- Automotive Transmissions: Used in gearboxes, clutches, and driveshafts where space and load capacity are critical.
- Industrial Gearboxes: Provides reliable support for gears and shafts in heavy-duty industrial machinery.
- Two-Stroke Engines: Ideal for connecting rods, piston pins, and crankshafts due to its high performance.
- Power Tools: Employed in drills, saws, and grinders to handle high-speed rotational forces.
- Pumps and Compressors: Ensures smooth and efficient operation of rotating components under heavy loads.
- Printing and Textile Machinery: Offers precision and durability for rollers and other moving parts.
- Construction Equipment: Suitable for pivots and linkages in heavy machinery like excavators and loaders.
Benefits of Using the NA 6903 Bearing
- Enhanced Design Flexibility: The presence of an inner ring allows for use with a wider range of shaft materials and finishes.
- Improved Machine Performance: High stiffness and running accuracy lead to more precise and reliable machine operation.
- Increased Durability: Manufactured from high-quality bearing steel for excellent wear resistance and longevity.
- Reduced Friction: The design minimizes rotational friction, which helps to lower operating temperatures and save energy.
- Space-Saving Solution: Its high load-to-size ratio allows for more compact and efficient equipment design.
- Reliable Operation: The caged design prevents roller-to-roller contact, ensuring consistent performance even at moderate speeds.
