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Understanding NTN Bearing Tolerances for Optimal Performance

NTN bearings are widely used in various industries across the world for their high durability and reliability. However, understanding NTN bearing tolerances can be essential for achieving optimal performance while using them. In this article, we will take a closer look at the different types of NTN bearing tolerances, how they are measured, and how they impact the performance of the bearings.

Deep Groove Ball Bearings
Brand NameDERUNA
Model Number6206
Place of OriginChina
Precision RatingP0 P6 P5 P4 P2
Seals TypeZZ 2RS
Product nameDERUNA bearing
ApplicationAutomotive.tractor.construction Machinery.rolling Mill
MaterialChrome Steel/GCr15 Stainless Steel
FeatureLong Life
ServiceOEM Customized Services
PackageOriginal package
SampleAvailabe
Self-aligning Ball Bearing
Brand NameDERUNA
Place of OriginChina
Precision RatingP0 P6 P5 P4 P2
Product nameDERUNA bearing
Applicationprecision instruments, low noise motors, automobiles, motorcycles and general machinery, etc.
MaterialChrome Steel/GCr15 Stainless Steel
FeatureLong Life
ServiceOEM Customized Services
PackageOriginal package
SampleAvailabe
Cylindrical Roller Bearings
Bearing MaterialsGCr15,GCr15SiMn,G20Cr2Ni4A etc. or Customerized
CageSteel Cage,Cooper Cage
Quality certificateISO9001:2000
FeatureLow Noise, Low Vibration, High Precision, Long Life
SizeID 100MM – OD 2000MM
BrandDERUNA
Tolerance StandardISO492, ANSI B3.14, DIN 620/2, GB307, SB/T53419-94, SB/CO/T10-89 etc.
Precision GradeABEC(1,3,5,7,9),P0,P6,P5,P4,P2 and Equal Level
ApplicationMetallurgical Machine, Paper Making Machine, Petrochemical,Mahine, Mining Machine, Gearing Machine, Cement, Etc.
FeatureLong Life
ServiceOEM Customized Services
PackageOriginal package
SampleAvailabe
Spherical Roller Bearing
ModelCA CAK CC CCK ME MA spherical roller bearings
MaterialChrome Steel, GCR15
TypeDouble Row
Sized:3-150mm,D:9-225mm
GradeP6,P5,P4
CageSteel Cage,Cooper Cage
Used ForPaper machine, deceleration device, railway vehicle axle, rolling mill gearbox seat, rolling mill roller track, crusher, vibrating,screen, printing machine, woodworking machinery,screen, printing machine, woodworking machinery
Warranty1 year
BrandOEM or HFZZ
PackingAccording to the buyer requests for packaging
Angular Contact Ball Bearing
BrandDERUNA
Quality Standard:ISO9001:2008
Bearing No.25TAC 47B
Precision:P0, P2, P4, P5, P6
Vibration Level:V1, V2, V3, V4
Clearance:C2, C3, C4, C5
Hardness:59-63 HRC
Seal TypesOpen or Sealed
Material:Gcr15, Gcr15SiMn, Chrome steel, ceramic, stainless steel
Cage materialSteel cage, bakelite, nylon, brass, PEEK
ApplicationAngular Contact Ball Bearing are widely used in Machine tool spindles, high frequency motors, gas turbines, centrifugal separator, small car front wheels, differential pinion shaft, roots blowers, air compressors, transmissions, printing machine motors, water pump, oil pump, cutting machines, reducers, prospecting machines, polishing machines, diesel engines, textile machinery, steel mills etc.
Tapered Roller Bearings
TypeROLLER-Taper Roller Bearing
Model Number30207 33106 33107 33108 33109 33110J2/Q
StructureTaper
MaterialChrome Steel
RetainerStamping Steel Plate
Applicable IndustriesBuilding Material Shops, Manufacturing Plant, Machinery Repair Shops, Printing Shops, Construction works , Energy & Mining etc..
Bore Size50-75 mm
Precision RatingP0 P6 P5 P4 P2
Seals TypeOPEN
Number of RowSingle & Double & Four Row
ShapeRound
CustomizableYes
Thrust Ball Bearings
MaterialChrome steel or Ceramic as customer required
Delivery Time7-35days
Trade termsT/T, L/C, Western Union, Paypal
MarketGlobal, but Asia, North America, South America, Middle East, Part of Europe are our main markets presently.
PackingAccording to the buyer requests for packaging
Applicable IndustriesMachinery Repair Shops, Printing Shops, Construction works , Energy & Mining
Spherical Trust Roller Bearing
Model29436 29436 E
MaterialChrome Steel, GCR15
TypeDouble Row
Size180x360x109 mm
GradePO,P6,P5,P4,P2
CageSteel Cage,Cooper Cage
Used ForPaper machine, deceleration device, railway vehicle axle, rolling mill gearbox seat, rolling mill roller track, crusher, vibrating,screen, printing machine, woodworking machinery.
Warranty1 year
BrandOEM or HFZZ
PackingAccording to the buyer requests for packaging
pillow block bearing
BrandFollow Customer’s Request
Model numberucp208-24
MaterialChrome Steel/GCr15
Number of rowSingle Row
PrecisionP0 P6 P5 P4 P2
STOCKGreat Supplying Ability
Warranty50000km or One year
Precision ratingABCE-1 ABCE-3 ABCE-5 ABCE-7
VibrationV1 V2 V3 V4
ClearanceC0 C2 C3 C4 C5
Delivery Detail2-5 days upon receipt of deposit or according to your requirements
ShippingExpress ,AIR ,Sea Shipping
Needle Roller Bearing
Modeloem
MaterialChrome Steel, GCR15
Size40*65*22mm
PrecisionPO,P6,P5,P4,P2
CageSteel Cage,copper Cage,nylon Cage
Used ForGearboxes of machine tools, Automobiles, Motorcycles, Textile machinery, printing machinery,
 forage machinery, agricultural machinery, numerical control equipment
Warranty1 year
BrandOEM
PackingAccording to the buyer requests for packaging
Shipping:Express: DHL Fedex EMS /By Sea
Bearing Advantage:1).Excellent and high quality control
2).Prompt delivery
3).Competitive price
4).Small order accepted
5).Customers’ drawing or samples accepted
6).OEM service

The Types of NTN Bearing Tolerances

NTN Bearing Tolerances

NTN bearing tolerances are classified into two major categories: dimensional and running accuracy. The dimensional accuracy of the bearing is a measure of the size, geometry, and position of its key components. This includes measurements such as the bore diameter, outer diameter, width, and overall running clearance. On the other hand, the running accuracy of NTN bearings refers to their ability to rotate smoothly at high speeds without any significant wobbling or vibration.

Understanding Dimensional Bearing Tolerances

  • Dimensional tolerances are an important aspect of bearing design, as they define the size and shape of the bearing components that mate with each other. NTN uses various methods to ensure dimensional accuracy, including CNC machining, grinding, and honing.
  • The dimensional tolerances that NTN bearings conform to are commonly expressed as a range of values, which are given as a deviation from the nominal (target) value. For example, the bore diameter may be specified as being 17 mm +/- 0.02 mm. This means that the bore diameter can vary within a range of 16.98 mm to 17.02 mm, while still being acceptable for its intended application.

Comparison of bearing tolerances classifications of national standards

Standard Standard Tolerance Class Bearing Types
Japanese Industrial Standard JIS B 1514 Class 0 Class 6X Class 6 Class 5 Class 4 Class 2 All types
International Organization for Standardization ISO 492 Normal class Class 6 Class 5 Class 4 Class 2 Radial bearings
Class 6X
ISO 199 Normal class Class 6 Class 5 Class 4 Thrust ball bearings
ISO 578 Class 4 Class 3 Class 0 Class 00 Tapered roller
bearings (Inch series)
ISO 1224 Class 5A Class 4A Precision instrument
bearings
Deutsches Institut DIN 620 P0 P6 P5 P4 P2 All types
fur Normung
American National Standards Institute (ANSI) ANSI/AFBMA Std. 201) ABEC-1 RBEC-1 ABEC-3 RBEC-3 ABEC-5 RBEC-5 ABEC-7 ABEC-9 Radial bearings (Except tapered
Anti-Friction Bearing Manufacturers (AFBMA) roller bearings)
ANSI/AFBMA Class K Class N Class C Class B Class A Tapered roller bear-
Std. 19.1 ings (Metric series)
ANSI B 3.19 Class 4 Class 2 Class 3 Class 0 Class 00 Tapered roller
AFBMA Std. 19 bearings (Inch series)
ANSI/AFBMA Std. 12.1 Class 3P Class 5P Class 5T Class 7P Class 7T Class 9P Precision instrument
ball bearings (Metric series)
ANSI/AFBMA Sts. 12.2 Class 3P Class 5P Class 5T Class 7P Class 7T Class 9P Precision instrument ball bearings
(Inch series)

1) “ABEC” is applied for ball bearings and “RBEC” for roller bearings.
Notes: 1. JIS B 1514, ISO 492 and 199, and DIN 620 have the same specification level.
2. The tolerance and allowance of JIS B 1514 are a little different from those of AFBMA standards.

Bearing types and applicable tolerance

Bearing Type standard Applicable tolerance
Deep groove ball bearing ISO 492 class 0 class 6 class 5 class 4 class 2
Angular contact ball bearings ISO 492 class 0 class 6 class 5 class 4 class 2
Self-aligning ball bearings ISO 492 class 0
Cylindrical roller bearings ISO 492 class 0 class 6 class 5 class 4 class 2
Needle roller bearings ISO 492 class 0 class 6 class 5 class 4
Spherical roller bearings ISO 492 class 0
Tapered roller bearings metric ISO 492 class 0,6X class 6 class 5 class 4
inch AFBMA Std. 19 class 4 class 2 class 3 class 0 class 00
J series ANSI/AFBMA Std.19.1 class K class N class C class B class A
Thrust ball bearings ISO 199 class 0 class 6 class 5 class 4
Thrust roller bearings NTN standard class 0 class 6 class 5 class 4
Spherical roller thrust bearings ISO 199 class 0
Double direction angular contact thrust ball bearings NTN standard class 5 class 4

The following is a list of codes and symbols used in the bearing
tolerance standards tables. However, in some cases the code
or symbol definition has been abbreviated.

Factors that Affect Dimensional Tolerances

  • Several factors can affect the dimensional tolerances of NTN bearings, including the precision of the manufacturing process, the type of material used, and the environmental conditions in which they are used. For example, a bearing that is exposed to higher temperatures may experience some thermal expansion, which can affect its tolerance levels. Additionally, the type of lubricant used can also affect the dimensional tolerances of the bearing, as some lubricants can cause swelling or shrinkage of the bearing components over time.
  • Running Accuracy and Tolerances
    Running accuracy of NTN bearings is a measurement of their ability to rotate smoothly at high speeds without any significant wobbling or vibration. The running accuracy is often expressed as a total runout (TIR) value or a radial internal clearance (RIC) value. The TIR value refers to the maximum distance that the center axis of the bearing can deviate from its true axis of rotation, while the RIC value refers to the clearance between the rolling elements and the raceway of the bearing. Both of these values are important in ensuring that the bearing operates smoothly and efficiently.
  • Achieving Optimal Performance with NTN Bearings
    When selecting and using NTN bearings, it is essential to consider both dimensional and running accuracies, as well as other factors such as load capacity, operating temperature, and lubrication requirements. Regular maintenance and testing should also be performed to monitor the performance of the bearings and identify any potential issues. By understanding the importance of bearing tolerances and taking the necessary steps to maintain their performance, you can ensure that your NTN bearings operate at peak efficiency, providing reliable and long-lasting service for your applications.

Conclusion:

  • In summary, understanding the tolerances of NTN bearings is crucial for achieving optimal performance and reliability. Dimensional tolerances ensure that the bearings are the correct size and shape, while running accuracy ensures that they rotate smoothly without any significant vibration.
  • Factors such as precision of manufacturing, material used, and environmental conditions can affect the dimensional tolerances, while load capacity, operating temperature, and lubrication requirements are important considerations for running accuracy. By following best practices for bearing selection and maintenance, you can ensure that your NTN bearings provide reliable and consistent service for your applications.

We are one of the largest suppliers of bearings in China. Providing the same products at the best price is the long term motivation and driving force for our business development. Contact us today to learn more about our products and services.

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