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NTN spherical roller bearing · NTN 240/670BK30
NTN 240/670BK30 spherical roller bearing

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NTN 240/670BK30 spherical roller bearing

Manufacturer Part Number240/670BK30Dimensions: 670 x 980 x 308 mm (d x D x B)240/670 bearing: all versions and brands →NTN 240 series: dimension table →
Brand
NTN
Category
Bearings
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Since 1945 · Martínez, Buenos Aires, Argentina

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How to read NTN 240/670BK30

240Series
Spherical roller bearings, 240 series. For the same bore, each series has a different outside diameter and width.
/670Bore
670 mm bore.
BK30Suffix
NTN suffix: it defines the variant (sealing, cage, internal clearance or other features).

240/670 is the standard (ISO) basic designation: it defines the type, the series and the bore.

Description

The NTN 240/670BK30 bearing has a 670 mm bore, a 980 mm outside diameter and a 308 mm width (670 x 980 x 308 mm).

NTN 240/670BK30 is a reference of spherical roller bearing, within Bearings. Request a quote for 240/670BK30 via WhatsApp or email with the quantity you need; we respond promptly with the quote and equivalents.

The spherical roller bearing is a component designed to support high radial loads and axial loads in both directions, even when the shaft presents angular misalignment. Its design with two rows of rollers and a spherical raceway allows the inner ring to oscillate, compensating for mounting errors or shaft deflections. It is used in demanding industrial applications where perfect alignment is not guaranteed.

The designation of this series is read in parts: the large number indicates the size and dimension series, while the letters and numbers that follow provide specific characteristics. For example, in 240/500BK30, the prefix 240 corresponds to the wide-section spherical roller bearing series; 500 is the bore diameter in millimeters; the letter B indicates a tapered bore design and the code K30 specifies a 1:30 taper. In other codes of the same series, the bore diameter varies according to the number that follows the slash. Thus, 240/530BK30 shares the same series and bore type, varying only the bore diameter measurement. Knowing this nomenclature allows you to quickly identify the particularities of each reference.

In Argentine industry, these bearings are used in mining equipment, cement plants, crushing plants, mills, conveyor belts and heavy machinery. They also appear in steel, paper and petroleum industry applications. Their ability to withstand combined loads and misalignments makes them ideal for long shafts or assemblies where thermal and mechanical deformations are common. MR Accesorios Industriales sells the NTN line to supply these sectors with the reliability that continuous operations demand.

To correctly select a spherical roller bearing, take into account the radial and axial load it must withstand, the rotation speed and the environmental conditions. Sealing is key: if there is dust, moisture or particles, choose variants with seals or flingers. Lubrication must be adequate, with grease or oil depending on the application, and it is essential to maintain an initial alignment within the limits allowed by the bearing itself. During mounting, verify the internal clearance and avoid impacts that could damage the rollers or raceways.

When replacing a bearing, it is common to find equivalent codes from other brands. Although the main dimensions usually coincide between manufacturers, there may be differences in internal design, cage or heat treatment. Therefore, it is always advisable to verify interchangeability by consulting the manufacturer's tables or contacting a specialist. At MR we advise you so that the replacement is safe and does not compromise equipment performance.

If you need to request a quote for an NTN spherical roller bearing, send us the code or size via WhatsApp. At MR Accesorios Industriales we quote you promptly and indicate the compatible alternative if you bring the code from another brand. We continue to support Argentine industry with reliable technical solutions.

Dimensions

Boundary dimensions of the basic designation 240/670 per ISO 15: 670 x 980 x 308 mm (d x D x B).

Bore
670 mm
Outside diameter (D)
980mm
Width (B)
308mm

The same size in other brands

Pages from other brands with the basic designation 240/670: 670 x 980 x 308 mm (d x D x B) per ISO 15.

They share the boundary dimensions set by ISO 15, not the technical data: seals or shields, internal clearance, cage and load rating can differ by brand and suffix. We quote each one by its full part number.

Frequently Asked Questions

What are the dimensions of the NTN 240/670BK30 bearing?
The NTN 240/670BK30 bearing has a 670 mm bore, a 980 mm outside diameter and a 308 mm width (670 x 980 x 308 mm). These are the standardised boundary dimensions (ISO 15) of the basic designation 240/670.
What does the code BK30 mean in the designation?
The B indicates that the bearing has a tapered bore and K30 specifies a 1:30 taper. This allows mounting on tapered shafts and adjusting internal clearance through axial displacement. It is a common feature in spherical roller bearings for demanding applications.
Does this bearing allow misalignment?
Yes, spherical roller bearings allow angular misalignment between the shaft and the housing, generally up to 1 to 2 degrees, depending on the design and operating conditions. This capacity makes them suitable for long shafts or assemblies where perfect alignment is not possible.
How do I request a quote for a specific size?
Write to us via WhatsApp with the complete code or the measurements you need. At MR Accesorios Industriales we quote you promptly and indicate the compatible alternative if you bring the code from another brand. This way we ensure you receive the correct bearing for your application.
Request a quote for 240/670BK30 via WhatsApp
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