3205B-2ZRTNG NSK 25x52x20.6

3205B-2ZRTNG NSK 25x52x20.6 - Double Row Angular Contact Bearing

3205B-2ZRTNG NSK is a double-row angular contact ball bearing with dimensions of 25x52x20.6 mm. The bearing has a 25 mm bore, 52 mm outside diameter and 20.6 mm width. The 2ZR suffix identifies metal shields on both sides, while TNG identifies a glass-fibre-reinforced polyamide cage guided by the rolling elements.

Technical data

The 25x52x20.6 mm dimensions and double-row angular contact construction are consistently reported for the exact NSK 3205B-2ZRTNG designation. NSK/RHP documentation also confirms 3205B-2ZRTNG as an NSK bearing reference.

Dimensions of 3205B-2ZRTNG

The bearing dimensions are:

25x52x20.6 mm

where:

• d 25 mm - bore diameter
• D 52 mm - outside diameter
• B 20.6 mm - bearing width

These dimensions should be checked together with the complete 3205B-2ZRTNG designation because bearings of the same basic size can differ in shielding, cage design, internal clearance and other construction details.

What does 3205B-2ZRTNG mean?

The complete designation is:

3205B-2ZRTNG

The suffixes are technically important and should be retained when identifying a replacement.

3205

3205 identifies the basic size and double-row angular contact ball bearing family.

For this NSK version, the dimensions are 25x52x20.6 mm.

B

B is part of the bearing's design designation.

There is conflicting secondary-source information on the precise contact angle associated with B for this exact bearing: one specialist catalogue states 25 degrees, while another reports 40 degrees. Because these sources conflict and I have not found an accessible current NSK technical page resolving the discrepancy for this exact SKU, I would not publish a numerical contact angle in the product specification without confirmation from NSK documentation.

This avoids transferring a parameter from a similar 3205 variant to the exact 3205B-2ZRTNG.

2ZR

2ZR identifies metal shields on both sides of the bearing.

The shields help protect the internal rolling elements and lubricant against contamination while avoiding the rubbing contact characteristic of contact rubber seals.

TNG

TNG identifies a solid cage made from glass-fibre-reinforced polyamide, guided by the rolling elements.

This is an important part of the complete specification and should not be omitted when replacing the bearing.

Double-row angular contact design

3205B-2ZRTNG is a double-row angular contact ball bearing.

Its two-row construction allows a single bearing unit to accommodate radial loads together with axial loads acting in both directions, within the operating limits specified for the bearing.

This type of construction can perform functions that would otherwise require a matched arrangement of two single-row angular contact ball bearings, while providing a compact bearing width.

The exact load ratings should be taken from NSK data for this specific variant rather than transferred from another 3205 bearing.

Metal shields on both sides

The 2ZR version has sheet-steel shields on both sides.

These shields:

• help protect the rolling contact area against contamination,
• help retain lubricant inside the bearing,
• do not have the same sealing characteristics as contacting elastomer seals.

Therefore, a 3205B-2ZRTNG should not automatically be treated as identical to a rubber-sealed 3205 variant.

TNG polyamide cage

The TNG suffix specifies a glass-fibre-reinforced polyamide cage with guidance by the rolling elements.

Cage construction is technically relevant when identifying a replacement. A bearing with identical 25x52x20.6 mm dimensions but a different cage suffix is not necessarily the same execution.

3205B-2ZRTNG vs other 3205 variants

The complete designation should always be checked.

For example, NSK/RHP listings include variants such as:

3205B-2ZRTNG

and

3205B-2ZRTNGC3

The additional C3 identifies a different internal-clearance specification. The standard 3205B-2ZRTNG is reported with normal internal clearance, whereas a C3 version should not automatically be substituted without checking the requirements of the application.

Similarly, bearings with open, shielded or sealed construction may share the same basic 3205 dimensions but differ significantly in operating characteristics.

Internal clearance

For the exact 3205B-2ZRTNG version, specialist bearing catalogues specify normal internal clearance.

This distinction is important because NSK also lists versions containing the C3 suffix.

When replacing an existing bearing, do not assume that CN and C3 versions are interchangeable simply because their external dimensions are identical.

Selection and interchangeability

Before ordering 3205B-2ZRTNG, verify:

• full designation 3205B-2ZRTNG,
• manufacturer NSK,
• dimensions 25x52x20.6 mm,
• double-row angular contact design,
• 2ZR metal shields,
• TNG cage,
• required internal clearance,
• shaft and housing fits,
• required load capacity,
• operating speed,
• operating temperature,
• lubrication conditions,
• requirements of the specific machine.

Identical 25x52x20.6 mm dimensions do not automatically guarantee full interchangeability.

The complete suffix configuration should also be compared.

Alternative designations and search references

Natural designation variants include:

• 3205B-2ZRTNG NSK
• NSK 3205B-2ZRTNG
• 3205 B-2ZRTNG NSK
• 3205 B 2ZRTNG NSK
• NSK 3205 B-2ZRTNG
• 3205B 2ZRTNG NSK
• 3205B-2ZRTNG 25x52x20.6
• NSK 3205B 25x52x20.6

An NSK/RHP price list confirms the full NSK reference 3205B-2ZRTNG.

Application

3205B-2ZRTNG is designed for bearing arrangements requiring a compact double-row angular contact ball bearing capable of supporting combined radial and axial loading.

The exact bearing has also been documented as a bearing used in industrial submersible pump assemblies. For example, current BJM pump documentation identifies 3205B-2ZRTNG as the lower motor bearing in several pump models. This is a confirmed example of use, not a statement that the bearing is limited to pump applications.

For replacement in a specific machine, the original bearing designation and equipment documentation should always take priority.

Installation

The bearing and surrounding components should be kept clean during installation.

When mounting:

• apply installation force only through the ring being fitted,
• do not transmit mounting force through the balls and raceways,
• protect the metal shields against deformation,
• verify shaft and housing fits,
• avoid direct hammer blows,
• follow the machine manufacturer's mounting and lubrication requirements.

Correct mounting is particularly important for a double-row angular contact bearing because incorrect fits or installation forces can affect internal geometry and bearing life.

FAQ

What are the dimensions of NSK 3205B-2ZRTNG?

The dimensions are 25x52x20.6 mm: 25 mm bore, 52 mm outside diameter and 20.6 mm width.

What type of bearing is 3205B-2ZRTNG?

It is a double-row angular contact ball bearing manufactured by NSK.

What does 2ZR mean?

2ZR specifies sheet-steel shields on both sides of the bearing.

What does TNG mean?

TNG specifies a solid glass-fibre-reinforced polyamide cage guided by the rolling elements.

Is 3205B-2ZRTNG a double-row bearing?

Yes. It is a double-row angular contact ball bearing.

Is 3205B-2ZRTNG the same as 3205B-2ZRTNGC3?

No. The C3 suffix identifies a different internal-clearance specification. NSK/RHP listings distinguish the two references.

Does 3205B-2ZRTNG have rubber seals?

No. The 2ZR designation specifies metal shields on both sides, not contacting rubber seals.

Can another 25x52x20.6 mm bearing replace 3205B-2ZRTNG?

Not automatically. The bearing type, number of rows, shields, cage, internal clearance and requirements of the application must also be checked.

3205B-2ZRTNG NSK - key information

3205B-2ZRTNG NSK is a double-row angular contact ball bearing with dimensions of 25x52x20.6 mm. It has metal shields on both sides and a glass-fibre-reinforced polyamide cage guided by the rolling elements. The complete designation should be retained when selecting a replacement because other 3205 variants can differ in shielding, cage and internal-clearance specification.