Roller spherical bearings
NTE double-row radial spherical roller bearings are designed to accommodate heavy radial loads as well as axial loads not exceeding 25% of the unused permissible radial load capacity. They are self-aligning and can operate normally with shaft misalignment relative to the housing of up to 1°, and some designs up to 2.5°. Bearings with integral seals permit misalignment of up to 0.5°.
Size range
- Bore diameter: from 20 to 1800 mm
- Outside diameter: from 52 to 2180 mm
- Bearing width: from 18 to 375 mm
The full-size range is available in the NTE technical catalogue.
Design and operating principle
This type of bearing can withstand high radial and axial loads simultaneously due to the special design of the spherical rollers, allowing contact with the raceways along a line rather than at a point, unlike ball bearings.
The bearing design consists of the following components:
- Rollers: rolling elements of a special profile made of high-quality chromium steel ensure a large contact area with the raceways, enhancing load capacity.
- Rings: outer and inner – can be with cylindrical and tapered bores for easy mounting on the shaft.
- Cages: pressed steel cages are used for smaller sizes, while brass cages are applied in larger bearings.
- Lubrication grooves and holes (W33): ensure easy and uniform lubrication.
Most bearings are supplied in an open design, which simplifies lubrication.
Technical specifications
NTE spherical roller bearings are available with different radial internal clearances: C3 for operation under heavy loads and elevated temperatures, and C4 for extremely severe conditions involving vibration and high thermal loads:
- Maximum rotational speed – up to 17,000 rpm.
- Operating temperature range – standard spherical roller bearings are thermally stabilized for operation at temperatures up to 150 °C.
- Basic dynamic load rating – up to 17,300 kN. This is almost three times higher than that of ball bearings.
Current values for speed, loads, and temperatures are shown in the NTE technical parameters table.
Industrial advantages
The NTE bearing range includes models from light and medium-duty (0.6 kg) to heavy-duty (up to 2,950 kg) for specialized industrial equipment. All models offer the following advantages:
- High load capacity – allows the products to be used in critically loaded assemblies without increasing the number of supports.
- Flexible mounting options – bearings can be installed directly on the shaft, via adapter sleeves, or in housed units, simplifying maintenance procedures.
- Reliability in extreme conditions – durable rollers and cages ensure operation even under high vibration, shock loads, and high temperatures.
- Resistance to misalignment and deformation – the bearing compensates for shaft misalignment up to 0.5° (up to 2° under reduced load), preventing premature failure caused by installation errors or housing deflection.
High load capacity, effective self-alignment, and efficient lubrication ensure a long service life even in demanding operating environments.
Fields of application
NTE offers the opportunity to order spherical roller bearings with delivery through its distribution network for all major industries, particularly those operating under severe conditions:
- Metallurgy: rolling mills, roller tables, continuous casting machines.
- Mining: crushers, ball and rod mills, vibrating screens, conveyor pulleys.
- Heavy machinery: high-power gearboxes, main machine shafts, supports for heavy mechanisms.
- Energy sector: turbine units, generators, thermal power plant mills, high-capacity pumps.
- Construction and quarry equipment: excavators, crushing and screening plants, concrete mixers.
- Agriculture: combine harvesters, shredders, soil cultivation machinery.
Spherical roller bearings types
NTE provides spherical roller bearings with various design configurations suitable for light, medium, and heavy-duty equipment:
By bearing design:
- Open type – the most common design, providing good conditions for lubrication and cooling.
- Sealed bearings – to protect rolling elements from dirt.
- Split bearings – for easy installation.
By bore type:
- Cylindrical bore – for direct mounting on the shaft, no bushings are required, which reduces the cost of additional components.
- Tapered bore (1:12, K) – mounting is carried out through a fixing or clamping bushing, which provides convenient tension adjustment and reliable retention on the shaft.
Why choose NTE
- Stable supply – reduced waiting times.
- Quality assurance – certified products and multi-stage inspection.
- Flexible terms of cooperation – the option to buy bearings wholesale, discounts, and tailored offers.
- Extensive product range – multiple sizes and designs available.
Choosing to buy spherical roller bearings is a strategic decision for equipment operating under maximum loads. Invest in predictable maintenance and rest assured about your production!
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