NSK guide
What NSK manufactures and what it stands out for
NSK manufactures a wide range of bearings for industrial and automotive applications. Its main products include deep groove ball bearings, angular contact bearings, tapered roller bearings, cylindrical roller bearings, spherical roller bearings, thrust ball and roller bearings, and needle roller bearings. It also produces insert bearing housings, linear motion units such as ball screws and actuators, and fastening components such as adapter sleeves and lock nuts.
The brand stands out for its dimensional precision and the quality of its steels, which translates into bearings with high load capacity, low noise level and long service life. In the linear motion field, its ball screws and actuators are recognized for their repeatability and rigidity, ideal for machine tools and automation. In housings, its UCP units and similar offer simple mounting and self-alignment.
NSK lines distributed by MR
At MR Accesorios Industriales we work with the main NSK categories to supply Argentine industry. Below we detail the lines and subcategories you can quote with us.
Bearings
We distribute needle roller bearings, tapered roller bearings, Y-bearings (insert), deep groove ball bearings, spherical roller bearings, cages and needle roller components, cylindrical roller bearings, thrust ball bearings, inner rings, angular contact bearings, cam and support rollers, and spherical plain bearings. Each subcategory covers multiple series and sizes for different applications.
Bearing housings
Includes Y-housings with insert bearing, such as UCP, UCF series and similar. They are complete units ready to mount on shafts, with cast iron housing and sealed self-aligning bearing.
Linear motion
We offer ball screws, linear actuators and precision components for positioning. The W, MCM, TCH and PSS series are examples of this line.
Bushings and adapter sleeves
Includes adapter and withdrawal sleeves, lock nuts and inner rings for needle roller bearings. Sleeves and nuts are key components for mounting and dismounting bearings with tapered bore.
Main NSK series
NSK organizes its products into series that identify the type of bearing or component and its dimensions. Knowing the series helps you find the correct code and understand its characteristics. Below we present the most relevant series we distribute, with examples of real codes.
W series (linear motion)
The W series corresponds to precision ball screws for linear motion. It is used in machine tools and positioning systems. Examples: W1001FA-2-C3T4, W1001FA-4-C3T4.
HR series (tapered rollers)
The HR series identifies metric tapered roller bearings. They support combined radial and axial loads. Examples: HR 302/22, HR 302/28.
FIR series (inner ring)
The FIR series are inner rings for needle roller bearings, used when the shaft cannot serve as raceway, for example if it is not hardened and ground. Examples: FIR-071010, FIR-071012.
23xx series (spherical rollers)
The 23xx series are spherical roller bearings, with self-aligning capability. Examples: 23012CE4, 23120CE4.
FWF series (needle cages)
The FWF series are needle cages for needle roller bearings. Examples: FWF-101410, FWF-101413.
MCM series (linear actuators)
The MCM series are precision linear actuators for positioning. Examples: MCM03005H05K00, MCM03005H10K00.
TCH series (linear motion)
The TCH series corresponds to precision linear motion products. Examples: TCH06005H05K00, TCH06005H10K00.
NU series (cylindrical rollers)
The NU series are cylindrical roller bearings with outer ring with two ribs and inner ring without ribs, allowing relative axial displacement between rings. Examples: NU312, NU317.
PSS series (ball screws)
The PSS series are precision ball screws for high accuracy applications. Examples: PSS0608NAD0150, PSS0608NBD0150.
How to read an NSK code
The designation of an NSK bearing follows an alphanumeric system that indicates type, dimensions and characteristics. Understanding it allows you to identify the correct part and avoid mistakes when buying. Below we show real examples of codes and their interpretation.
Example: 6205
In a deep groove ball bearing such as 6205, the first digit (6) indicates the type (single row deep groove ball), the second (2) the diameter series (defines the outer diameter), and the last two (05) the bore diameter in millimeters multiplied by 5 (05 = 25 mm).
Example: HR 302/22
In HR 302/22, HR indicates metric tapered roller bearing, 302 is the series and 22 the bore diameter in millimeters (22 mm).
Example: UCP201-008D1
In UCP201-008D1, UCP is pillow block housing with insert bearing, 201 indicates the series and size, -008 indicates the shaft diameter in inches (1/2"), and D1 is a design variant of the insert.
Example: 23012CE4
In 23012CE4, 230 is the spherical roller series, 12 the bore diameter (60 mm) and CE4 an NSK internal design suffix (E4 indicates groove and lubrication holes in the outer ring). That is why it is always advisable to quote with the complete suffix.
Frequent NSK prefixes and suffixes
Suffixes in NSK codes provide information about sealing, cage, internal clearance and precision. Knowing them helps you choose the right bearing for your application.
Sealing suffixes
DDU: bearing with contact rubber seals on both sides (equivalent to 2RS of other brands). VV: with non-contact rubber seals on both sides. ZZ: with metal shields on both sides. These suffixes indicate protection against contaminants and lubricant retention.
Internal clearance suffixes
C3: internal clearance greater than normal. C4: even greater internal clearance. These suffixes are important when there are temperature differences or forced fits.
Precision suffixes
P5, P4: dimensional and running precision classes, where P4 is more precise than P5. They are used in machine tool spindles.
Other suffixes
D1: design variant in insert bearings. E4: groove and lubrication holes in the outer ring of spherical roller bearings. CAME4: spherical roller variant with machined brass cage and lubrication via groove and holes in the outer ring.
Applications by industry in Argentina
NSK products are used in a wide variety of industries in Argentina. Below we detail the main ones and what type of bearing or component is used in each.
Metallurgy
In the metallurgical industry, spherical and cylindrical roller bearings are used in rolling mills, roller tables and process equipment. They withstand heavy loads and misalignments.
Agriculture
In agriculture, insert bearings and UCP housings are mounted on augers, norias and grain conveyors. They must resist dust and vibrations.
Naval
In the naval industry, spherical roller and thrust bearings are used in propulsion shafts, winches and cranes. They require corrosion resistance and high loads.
Oil
In the oil industry, tapered and cylindrical roller bearings are used in pumps, compressors and drilling equipment. They must withstand combined loads and aggressive environments.
Food
In food industry, stainless steel bearings and sealed housings are used in conveyor belts, mixers and packaging machines. Hygiene and washdown resistance are prioritized.
Mining
In mining, spherical and cylindrical roller bearings are mounted in crushers, mills and screens. They withstand extreme loads and contamination.
Paper
In paper industry, spherical and cylindrical roller bearings are used in paper machine rolls and dryers. They require high precision and temperature resistance.
Cement
In cement plants, spherical and thrust roller bearings are used in kilns, mills and conveyors. They must withstand heavy loads and high temperatures.
Energy
In power generation, cylindrical and spherical roller bearings are used in turbines, generators and pumps. High reliability and long life are required.
Automotive
In automotive, tapered and deep groove ball bearings are mounted in gearboxes, differentials and wheels. They must withstand dynamic loads and variable speeds.
Plastics
In plastics industry, cylindrical and thrust roller bearings are used in extruders and injection molding machines. They withstand axial loads and high temperatures.
Refrigeration
In refrigeration, sealed and stainless steel bearings are used in conveyors and cold equipment. They resist humidity and frequent washdowns.
Sugar
In sugar industry, spherical roller bearings and housings are used in mills and cane conveyors. They must withstand heavy loads and contamination.
How to choose the correct NSK
Selecting the right NSK bearing requires evaluating the operating conditions of your equipment. Consider the following criteria to ensure optimal performance and long service life.
Load
Determine the magnitude and direction of loads: radial, axial or combined. Deep groove ball bearings support moderate radial and axial loads; tapered roller bearings, combined loads; thrust bearings, pure axial loads.
Speed
Rotation speed influences the choice of type and lubrication. Ball bearings usually allow higher speeds than roller bearings. Check the bearing's limiting speed.
Sealing
If the environment has dust or humidity, choose bearings with seals (DDU, VV) or shields (ZZ). Rubber seals better retain lubricant and prevent contaminant entry.
Internal clearance
Internal clearance (C3, C4) is selected according to fits and temperature differences. Greater clearance may be necessary if the shaft heats up or if fits are forced.
Mounting
Consider the type of mounting: with cylindrical or tapered bore, with adapter or withdrawal sleeve. Insert bearing housings simplify mounting on long shafts.
Environment
In corrosive or washdown environments, opt for stainless steel bearings or special seals. At high temperatures, check the cage material and lubricant.
Equivalences and interchangeability
Many NSK codes have equivalents in other brands, since the main dimensions of many series are standardized by ISO. In our catalog you can find the same code in brands such as NTN or TIMKEN. Below we show some examples of NSK codes and their equivalents in other brands we distribute.
NN 3028
The NSK cylindrical roller bearing NN 3028 has an equivalent in NTN with code NN3028. Both share standardized dimensions; load capacity may vary by manufacturer.
NN 3064
The NSK bearing NN 3064 is equivalent to NTN's NN3064. You can use either if specifications match.
HJ 304
The NSK angle ring HJ 304 has an equivalent in NTN as HJ304. It is important to verify the fit with the corresponding bearing.
2735 X
The NSK tapered roller bearing 2735 X is equivalent to TIMKEN's 2735X. Dimensions match; it is a cone (inner ring with rollers), which is combined with the corresponding cup.
5566
The NSK bearing 5566 has an equivalent in TIMKEN with the same code. Verify the contact angle and load capacity.
6376
The NSK bearing 6376 is equivalent to TIMKEN's 6376. Both are cones (inner ring with rollers and cage) of inch tapered roller bearings, which are combined with the corresponding cup.
3982
The NSK bearing 3982 has an equivalent in TIMKEN as 3982. Check exact dimensions before replacing.
5584
The NSK bearing 5584 is equivalent to TIMKEN's 5584. Verify that the corresponding cup and dimensions match before replacing.
Frequent mistakes when replacing or buying NSK
When buying NSK bearings, it is common to make mistakes that can lead to premature failures or plant downtime. We tell you the most frequent ones and how to avoid them.
Ignoring suffixes
Not paying attention to suffixes such as DDU, C3 or D1 can lead to buying a bearing with incorrect sealing or internal clearance. Always quote with the complete code.
Confusing similar series
Series such as 60, 62 and 63 share the bore diameter, but differ in outer diameter, width and load capacity. Verify the complete number and dimensions.
Not considering the environment
Using bearings without seals in dusty or humid environments reduces their service life. Choose the appropriate sealing for your application.
Improper mounting
Mounting with blows or without the correct tools can damage the raceways. Use heating methods or hydraulic presses.
Incorrect lubrication
Using the wrong lubricant or insufficient quantity causes premature wear. Follow the manufacturer's recommendations.
Mounting, lubrication and maintenance
Correct mounting and maintenance of NSK bearings extends their service life and avoids costly failures. Below we give general guidelines.
Mounting
To mount bearings with interference fit, heat the bearing in an oil bath or with an induction heater, never with a direct flame. Use appropriate tools to avoid damaging the raceways.
Lubrication
Choose the lubricant according to speed, load and temperature. Grease should fill between 30% and 50% of the free space. In high-speed applications, use oil.
Maintenance
Monitor vibrations and temperature to detect incipient failures. Regrease periodically according to the maintenance plan. Replace bearings when they show signs of fatigue.
Storage
Store bearings in their original packaging, in a dry place free of vibrations. Avoid stacking them to prevent damage to seals.
Why quote NSK at MR Accesorios Industriales
At MR Accesorios Industriales we distribute the NSK brand with technical advice and an online catalog that allows you to search by code. We are in Buenos Aires, Argentina, and since 1945 we have supplied industry with bearings, power transmission and precision components.
If you need an NSK bearing, a housing or a ball screw, send us the code, measurement or a photo of the part via WhatsApp or email. We will quote you promptly and coordinate delivery nationwide.
Frequently asked questions about NSK
- How do I know which NSK bearing I need?
- Identify the complete code printed on the old bearing or in the equipment manual. If you don't have it, measure the inner, outer and width diameters, and consult us with that data. You can also send us a photo of the part.
- What does the DDU suffix mean on an NSK bearing?
- The DDU suffix indicates that the bearing has contact rubber seals on both sides (what other brands call 2RS). This protects against dust and moisture ingress, and retains grease inside. It is ideal for contaminated environments.
- Can I replace an NSK bearing with another brand?
- Yes, if dimensions and specifications match. Many NSK codes have equivalents in brands such as NTN or TIMKEN. Verify the complete code and suffixes to ensure interchangeability.
- How do I read the code of an NSK bearing?
- The basic code indicates type, series and bore diameter. For example, in 6205, 6 is deep groove ball, 2 the series and 05 the diameter (25 mm). Suffixes add sealing, internal clearance or precision.
- What is an NSK spherical roller bearing?
- It is a bearing with two rows of rollers and spherical outer raceway that allows self-alignment. It supports high radial and axial loads, and is used in equipment with misalignment or shaft deflection.
- Where to buy NSK bearings in Argentina?
- At MR Accesorios Industriales, in Buenos Aires, we distribute NSK bearings and other brands. You can quote via WhatsApp or email with the exact code and we will respond promptly.
- What is an NSK UCP housing?
- It is a pillow block housing unit with self-aligning and sealed insert bearing. It is mounted on a flat base and is used to support shafts in conveyors, mixers and other equipment.
- Does NSK manufacture ball screws?
- Yes, NSK produces precision ball screws for linear motion, such as the W and PSS series. They are used in machine tools and automation. At MR we distribute them.
Updated September 29, 2026