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Bearings
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Housings/housing Units
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Linear Technology
Linear Technology
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Seals
FAG
Cylindrical Roller Bearings FAG NJ304 -E-XL-M1-C3
- Technical data
- Inner diameter
- 20 mm
- Outer diameter
- 52 mm
- Width
- 15 mm
- Roller rows
- Single row bearing
- Seal
- None, open bearing
- Cage
- Brass cage
- Clearance
- Slightly increased radial clearance
- Running accuracy
- Tolerance class P0/PN2 / ABEC 1
- Current insulation
- No current insulation
- Bore
- Cylindrical bore
- Outer ring
- Without groove/lubrication holes
- Design
- Support bearing (axial displacement), inner ring removable on one side
- Temperature range
- -30 to +150 °C
- Weight
- 0,168 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 15 | 3,44 € | 65,34 € |
| 30 | 6,88 € | 61,90 € |
Cylindrical Roller Bearings FAG NJ304 -E-XL-M1-C3
The FAG NJ304 -E-XL-M1-C3 cylindrical roller bearing offers high radial load capacity with a 20 mm bore, 52 mm outer diameter and 15 mm width.
The NJ304 -E-XL-M1-C3 cylindrical roller bearing is a single-row radial roller bearing in an open design. The design combines solid rings with cylindrical rollers guided by a robust brass cage. Manufactured to standard tolerance P0/PN (equivalent to ABEC 1), the bearing is suitable for demanding industrial applications. The open design, without sealing washers, allows for direct lubrication via the surrounding system and enables an operating temperature range of –30 to +150 degrees Celsius.
What is the NJ design suitable for in this cylindrical roller bearing?
The NJ design functions as a support bearing during operation. The outer ring has two fixed flanges, whilst the inner ring, which can be removed from one side, has a single fixed flange. As a result, the bearing accommodates not only high radial forces but also axial forces from one direction. In the opposite direction, the design allows for axial displacement of the shaft relative to the housing. This property compensates for heat-induced changes in length without causing stress, which is why this design is suitable for bearing arrangements subject to thermal shaft expansion.
What are the advantages of the brass cage and the C3 clearance?
The suffix M1 denotes a solid brass cage. Brass has high strength and is resistant to vibrations, impacts and lubricant additives. In addition, this variant features a C3 bearing clearance. This slightly increased radial clearance helps to ensure that the bearing rotates freely even with press fits or when there are temperature differences between the inner and outer rings. If heat is generated during continuous operation, the inner ring expands without the rolling elements being subjected to excessive stress.
What are the key features of the NJ304 -E-XL-M1-C3 cylindrical roller bearing?
A single-row roller bearing of the NJ type with an inner diameter of 20 mm, an outer diameter of 52 mm and a total width of 15 mm. It is characterised by its solid brass cage (M1) and the increased clearance class C3. It is primarily designed to withstand high radial loads whilst providing axial guidance in one direction.
What is the function of the NJ type as a support bearing?
In the NJ design, the inner ring guides the cylindrical rollers via a single flange, whilst the outer ring has two flanges. As a result, the component transmits axial forces in one direction. In the opposite direction, it allows for axial displacement, thereby compensating for thermal expansion of the shaft during operation without inducing stress.
What does the suffix ‘M1’ mean for this FAG bearing?
The designation M1 refers to a guided solid brass cage. Brass cages offer greater stability than simple sheet metal cages and effectively withstand dynamic accelerations and vibrations. They also exhibit good chemical resistance to many lubricants and additives.
Why is a C3 clearance useful for cylindrical roller bearings?
The designation C3 indicates an increased radial clearance compared with standard air clearance prior to installation. This prevents the rolling elements from becoming jammed if tight shaft fits cause the inner ring to expand or if significant temperature differences occur between the inner and outer rings. The bearing thus maintains its required operating clearance tolerance.
What is the temperature range for which the open cylindrical roller bearing is designed?
The bearing is specified for operating temperatures ranging from -30 to +150 degrees Celsius. As it is designed without integrated plastic seals, the tightness of the surrounding structure and the thermal resistance of the selected lubricant determine the respective practical operating limits.
Does the NJ304 cylindrical roller bearing need to be lubricated before use?
As the open design has no integrated seal and the outer ring is manufactured without a lubrication groove, lubrication is provided externally using a suitable grease or oil. Provision is made for the supply of the lubricant via the surrounding housing structure prior to commissioning.
Schaeffler Technologies AG & Co. KG
Industriestraße 1-3, 91074 Herzogenaurach, Germany
info.de@schaeffler.com, https://www.schaeffler.de/de/meta/impressum/
10002754