INA guide
What INA manufactures and what it stands out for
INA is a brand specialized in needle roller bearings, cam and support rollers, cylindrical roller thrust bearings and Y-bearings (inserts). Its catalog is aimed at applications where radial space is limited and high load capacity is needed, such as gearboxes, pumps, compressors and machine tools.
The brand stands out for dimensional precision and the variety of designs with seals, cages and specific treatments. In Argentine industry, INA products are used in maintenance and in original equipment manufacturing, especially in the metallurgical, automotive and food sectors.
INA lines distributed by MR
At MR Accesorios Industriales we work with two main INA categories: bearings and power transmission. Within bearings, the subcategories with the greatest presence are: needle roller bearing, Y-bearing (insert), cam and support roller, cylindrical roller thrust bearing, cages and needle components, and special bearings. In power transmission, we distribute freewheels.
Each subcategory includes multiple series and codes. For example, in needle roller bearings you will find the HK, NK, NA and RNA series; in Y-bearings, the UC and GE series; in cam followers, LR and NUTR; in cylindrical roller thrust bearings, GS and K; and in cages, the K series. There are also special crossed roller bearings and needle freewheels.
Main INA series
Below are the main INA series, with examples of real codes.
HK series: needle roller bushings
HK needle roller bushings are radial bearings with a drawn outer ring and no inner ring. They are mounted directly on the shaft, which acts as the raceway. They are ideal for very small radial spaces and high loads. Examples: HK0408, HK0509.
NK series: needle roller bearings without inner ring
The NK series has a machined outer ring and no inner ring. It is used in applications where the shaft is ground and hardened. It offers high load capacity and rigidity. Examples: NK12/12-XL, NK12/16-XL.
NA series: needle roller bearings with inner ring
NA bearings include an inner ring, which facilitates mounting and allows the use of shafts with normal tolerances. They are suitable for high radial loads and moderate speeds. Examples: NA4822-XL, NA4824-XL.
RNA series: variant without inner ring
The RNA series is similar to NA but without an inner ring. It is chosen when the shaft can act as a raceway and radial space needs to be reduced. Examples: RNA4822-XL, RNA4824-XL.
UC series: Y-bearings (inserts)
UC inserts have a spherical outer ring and are mounted in cast iron housings (pillow block or flanged). They are common in conveyors, agricultural equipment and fans. Examples: UC201, UC202.
GE series: Y-bearings with KRR seal
The GE series is an insert variant with lip seal and specific design. It is used in dusty or humid environments. Examples: GE17-XL-KRR-B, GE20-XL-KLL-B.
LR series: support rollers
LR support rollers have a thick-walled outer ring and withstand high radial loads. They are used in cams, linear guides and transport systems. Examples: LR206-2RS, LR207-2RS.
How to read an INA code
The INA designation combines letters and numbers that indicate type, dimensions and design. Knowing the structure helps you order the exact replacement and avoid errors.
Example: NK12/12-XL
NK identifies a needle roller bearing without inner ring; the first 12 is the shaft diameter (under the needles) in mm; the 12 after the slash is the width in mm; XL is the X-life design.
Example: HK0408
HK is a needle roller bushing; 04 is the shaft diameter in mm; 08 is the width in mm. It has no suffixes.
Example: UC201
UC is a Y-bearing (insert); 201 indicates the bore diameter according to series (12 mm in this case).
Example: GE20-XL-KRR-B
GE is an insert; 20 is the shaft diameter in mm; XL is the design; KRR is the lip seal; B is the inner ring design.
Example: LR206-2RS
LR is a support roller; 206 indicates size; 2RS is double-lip seal.
Example: GS81102
GS is a cylindrical roller thrust washer; 81102 is the series number that defines dimensions.
Frequent INA prefixes and suffixes
Suffixes in INA codes indicate design, sealing, cage or execution characteristics. Some of the most common:
2RS or 2RSR
Indicates double-lip seal on both sides, which protects against contaminants and retains grease.
XL
Indicates the X-life design, with optimizations that improve load capacity and service life.
KRR
In Y-bearings, indicates contact rubber lip seal, suitable for dusty or humid environments.
TV
Indicates polyamide cage reinforced with glass fiber.
B
In inserts, refers to the constructional form of the inner ring, generally with set screws.
Applications by industry in Argentina
INA products are used in a wide variety of industries in Argentina. Below are the main sectors and what type of bearing is used in each.
Metallurgical
In machine tools and process equipment, needle roller bearings of the NK, NA and RNA series are used, as well as cylindrical roller thrust bearings for spindles and rotary tables.
Agricultural
In seeders, harvesters and transport equipment, Y-bearings (inserts) of the UC and GE series are used, mounted in cast iron housings, and LR support rollers for guides.
Naval
In winches and deck equipment, needle roller bearings and cylindrical roller thrust bearings are used for their load capacity in little space.
Oil and gas
In pumps, compressors and drilling equipment, needle roller bearings and support rollers are used for their load capacity in reduced spaces and their resistance to demanding conditions.
Food
In packaging lines, conveyors and mixers, UC and GE inserts with effective sealing are used, and LR support rollers for belt guides.
Mining
In conveyor belts and auxiliary equipment, inserts and support rollers are used, with adequate sealing against dust and contamination.
Paper
In transport systems, guides and drive mechanisms of paper lines, needle roller bearings, support rollers and cylindrical roller thrust bearings are used for their precision and rigidity.
Cement
In conveyors and auxiliary plant equipment, inserts, needle roller bearings and support rollers are used, with sealing for dusty environments.
Energy
In gearboxes, auxiliary equipment and drive systems, needle roller bearings and cylindrical roller thrust bearings are used for their reliability and load capacity.
Automotive
In gearboxes, differentials and steering systems, needle roller bearings of the HK, NK and NA series are used, and LR support rollers.
Plastics
In extruders, injection molding machines and molding equipment, needle roller bearings and cylindrical roller thrust bearings are used to withstand loads and moderate temperatures.
Refrigeration
In conveyors, cold equipment and processing lines, UC and GE inserts with sealing for humid and washable environments are used.
Sugar
In conveyors and process equipment, inserts and support rollers are used, with sealing for humid environments and with bagasse.
How to choose the correct INA bearing
To select the appropriate INA bearing, consider these criteria:
Load
Determine the magnitude and direction of loads (radial, axial or combined). Needle roller bearings withstand high radial loads; cylindrical roller thrust bearings, axial loads; support rollers, radial loads with impact.
Speed
Check the rotational speed. The permissible speed depends on the bearing type and cage (for example, polyamide TV or steel sheet); for high speeds, consult the technical data sheet.
Sealing
If the environment has dust, humidity or washdowns, choose versions with seals (2RS, KRR) to prolong service life.
Internal clearance
Radial clearance (C2, C3, etc.) affects operation. For applications with thermal expansion, C3 is often used. Check the equipment specification.
Mounting
Consider whether the bearing has an inner ring or not. If the shaft is ground and hardened, you can use series without inner ring (NK, HK) to save space.
Environment
In corrosive environments or with extreme temperatures, ask about special designs or surface treatments.
Equivalences and interchangeability
Some INA codes have their correspondence in other brands that we also distribute. For example, the INA support roller NATR17-PP corresponds to SKF's NATR 17 PP. The INA needle roller bushing BK1212 is equivalent to SKF's BK 1212 and NTN's BK1212.
However, not all codes are interchangeable without verification. The main dimensions (bore, outer diameter and width) must match, but the sealing, cage or internal clearance may vary. Before replacing, compare the technical data sheets or consult us with the complete code.
Examples of equivalences
Some part-number correspondences between brands: NATR17-PP INA = NATR 17 PP SKF; BK1212 INA = BK 1212 SKF = BK1212 NTN; KR72-PP INA = KR 72 PP SKF; UC209 INA = UC 209 SKF; 81232-M INA = 81232 M SKF.
Frequent errors when replacing or buying INA
When ordering an INA bearing, it is common to make mistakes that can cause plant downtime or premature failures. These are the most common:
Not verifying the complete suffix
A code like NK12/12 may have variants with suffixes (XL, TV, etc.) that change the design. Ordering only the base number may result in an unsuitable bearing.
Confusing similar series
NA and RNA differ by the inner ring; HK and NK by the type of outer ring. Verify the exact letters.
Ignoring sealing
In contaminated environments, an open bearing will be damaged quickly. Choose the sealed version (2RS, KRR) if applicable.
Not considering internal clearance
Incorrect clearance can cause overheating or vibration. Respect the equipment manufacturer's specification.
Assuming equivalence without verifying
Although dimensions may match, load capacity or cage type may differ. Consult the technical data sheet or our team.
Mounting, lubrication and maintenance
Correct mounting and adequate lubrication extend the service life of INA bearings. Follow these recommendations:
Mounting
Use appropriate tools and avoid striking the rings directly. For bearings without inner ring, the shaft must have the specified hardness and roughness.
Lubrication
Respect the recommended grease type and quantity. Sealed bearings are lubricated at the factory, but open bearings require initial lubrication and periodic relubrication.
Maintenance
Monitor temperature, noise and vibration. At signs of wear, replace the bearing to avoid major equipment damage.
Why get an INA quote at MR Accesorios Industriales
At MR Accesorios Industriales we distribute the INA brand in Buenos Aires, Argentina, since 1945. Our online catalog allows you to search by code and view references, with technical advice to choose the correct product.
If you have the INA code, the measurement or a photo of the part, write to us via WhatsApp or email and we will quote you promptly. We serve buyers and maintenance managers in Argentine industry.
Frequently asked questions about INA
- What does the XL suffix mean in INA bearings?
- The XL suffix indicates the X-life design, with optimizations that improve load capacity and service life. It does not change the main dimensions. Always verify the complete code.
- How do I identify an INA needle roller bearing?
- INA needle roller bearings usually have prefixes such as HK, NK, NA or RNA. HK is a drawn cup bushing; NK without inner ring; NA with inner ring; RNA without inner ring but with machined outer ring. The number indicates dimensions.
- What is the difference between UC and GE in INA Y-bearings?
- Both are insert series with spherical outer ring. The difference is in the design and sealing: the GE series is offered with contact seals (KRR, KLL). The choice depends on the environment and shaft fixing.
- Can I replace an INA bearing with another brand?
- Yes, if dimensions and characteristics match. Some INA codes have direct equivalents in SKF or NTN, but verify sealing, cage and internal clearance. Consult us with the complete code.
- What is an INA LR series support roller?
- It is a cylindrical roller bearing with a thick-walled outer ring, designed to roll on a track. It withstands high radial loads and is used in cams, guides and conveyors. Examples: LR206-2RS.
- How do I request a quote for an INA bearing?
- Send via WhatsApp or email the complete code (for example, NK12/12-XL), the measurement or a photo of the part. We will respond promptly with the proposal.
- Does INA manufacture bearings for high temperatures?
- INA offers designs with special treatments for elevated temperatures. Ask for the specific code, which has suffixes for that design. Indicate the working temperature.
- What is an INA freewheel?
- It is a transmission component that allows rotation in one direction and blocks the opposite. It is used as a backstop or indexer. INA has needle freewheels, such as the HFL series.
Updated September 29, 2026