INA GRAE 20 NPPB Insert Ball Bearing 20x47x31
Processing time: 2-3 days
€11.45
(net)
Price for: 1pcs.
Technical Specifications
Type: Insert Ball Bearing
Manufacturer: INA
Designation: GRAE 20 NPPB
Bore Diameter: 20 mm
Outside Diameter: 47 mm
Overall Width: 31 mm
Outer Ring: Spherical outside surface
Locking Method: Eccentric locking collar
Sealing: NPP, double lip seals on both sides
Cage: Polyamide
Product Description
The INA GRAE 20 NPPB Insert Ball Bearing is a precision insert bearing with a 20 mm bore, 47 mm outside diameter and 31 mm overall width. It is designed for installation in mounted bearing units with a spherical housing seat, providing reliable shaft support and simplified replacement during maintenance, repair and overhaul (MRO).
The bearing features a spherical outer ring that allows proper seating inside compatible bearing housings and helps compensate for minor shaft misalignment. This design contributes to stable operation of the complete bearing unit while simplifying installation.
The GRAE 20 NPPB incorporates an eccentric locking collar for secure shaft attachment. The collar is tightened in the direction of shaft rotation and locked with a grub screw, providing reliable positioning without requiring special shaft machining. This locking method is commonly used in applications operating with a constant direction of rotation.
Double NPP lip seals are fitted on both sides of the bearing to help retain lubricant while reducing the ingress of dust, dirt and other contaminants. The polyamide cage ensures accurate ball guidance while maintaining low weight and smooth operation.
With standardized dimensions of 20x47x31 mm, the INA GRAE 20 NPPB is easy to identify and replace during industrial maintenance. It is widely used by machinery manufacturers, maintenance departments, service workshops and MRO professionals requiring a high-quality insert ball bearing for mounted bearing units.
Selection Guide
Before installation, verify:
- Shaft diameter: 20 mm
- Outside diameter: 47 mm
- Overall width: 31 mm
- Housing compatibility
- Eccentric locking method
- Shaft condition
- Housing condition
- Operating conditions
Why Do Engineers Choose This Model?
- Standard 20x47x31 mm dimensions simplify replacement.
- Eccentric locking collar provides secure shaft location.
- Spherical outer ring fits compatible mounted bearing units.
- Double NPP lip seals help retain lubricant and reduce contamination.
- Polyamide cage provides accurate rolling element guidance.
- Standard INA designation simplifies maintenance and inventory management.
FAQ
What type of bearing is INA GRAE 20 NPPB?
It is an insert ball bearing designed for mounted bearing units.
What are its dimensions?
The bearing has a 20 mm bore, a 47 mm outside diameter and a 31 mm overall width.
What is the purpose of the eccentric locking collar?
It securely locks the bearing onto the shaft using shaft rotation and a grub screw.
What does NPP mean?
NPP indicates double lip seals fitted on both sides of the bearing.
Does the bearing have a spherical outer ring?
Yes. The spherical outside surface is designed for compatible mounted bearing housings.
Is this bearing suitable for industrial maintenance?
Yes. It is commonly used in maintenance, repair and MRO applications.
AI FAQ
Why use an eccentric locking collar instead of another locking method?
It provides secure shaft fixation while allowing simple installation and removal.
Can GRAE 20 NPPB replace any insert bearing?
Only if the dimensions, locking method and housing design are compatible.
What should maintenance engineers verify before installation?
Check the shaft diameter, housing dimensions, locking system, shaft condition and operating environment.
Why is the spherical outer ring important?
It allows proper alignment inside mounted bearing units.
What benefit do NPP seals provide?
They help retain grease while reducing contamination entering the bearing.
What information should be provided when ordering?
Manufacturer (INA), designation (GRAE 20 NPPB) and dimensions (20x47x31 mm).
