Bearing iCatalogue

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Types of Bearings:

Selection of Bearings

Load Capacity

Depending on the magnitude and direction of load

Radial Load- DGBB, Cylidrical Roller Bearings

Axial Load- Thrust Ball & Roller Bearings

Combined Load- Taper Roller Barings, Angular Contact Ball Bearings

Couple Load- Double Row Bearings arranged in back to back or face to face

Mounting & Dismounting

Application where frequency of mounting and dismounting of bearings are high

Eg. Cylindrical Roller Bearings, Taper Roller Bearings

Speed

Depending on the dimension, accuracy, clearances, cage material, lubrications and heat factors

Limiting speed of the bearings are measured in rpm (rounds per minute)

Clearance

Depending on the load capacity, service life, temperature and noise levels

Eg. C2, C3, C4, C5 internal clearances

Tolerance

Depending on the machine’s accuracy, vibrations and noise

Eg. P6, P5, P4, P3, P2 tolerances (Lower the better grade)

Alignment & Displacement

Depending on the misalignment of the housing or shaft or bearing moving in forward or axial direction

Eg. Spherical Roller Bearings, Self Aligning Ball Bearings

Bearing Mounting

One of the factor that have influence on reliable work of bearing and its life is properly conducted mounting process. Few basic rules should be obeyed, especially:

  • keeping the mounting process absolutely clean,
  • protection of all parts (bearings especially)from contamination and corrosion,
  • determining order of mounting activities to eliminate mistake possibility,
  • using proper tools and shop devices,
  • checking correctness of bearing work in motion.


Types of mounting :

  • Press Fits-Fitting with a press is widely used for small bearings.
  • Shrink Fit

Bearing clearance refers to the space between the inner and outer races of a bearing. It is designed to allow for proper lubrication, heat expansion, and the smooth operation of the bearing. The clearance can be affected by factors such as manufacturing tolerances, wear, and temperature changes. It is important that the bearing will have the proper clearance to work efficiently and prolong the life of the bearing. ISO standards have established five clearance classes for bearing types. These classes are referred to as:

  • C2 = smaller than normal
  • C0 = normal clearance
  • C3 = greater than normal
  • C4 = greater than C3
  • C5 = greater than C4

Bearing tolerance refers to the acceptable amount of variation or deviation in the dimensions, form, and alignment of a bearing component. It ensures that bearings can function properly and meet the required performance criteria. Tolerances are specified based on factors such as the application, bearing type, and desired precision.

Following are the classification of bearing tolerances:

  • P6: Normal tolerance level, suitable for most general applications.
  • P5: Higher tolerance level than P6, providing greater precision and accuracy.
  • P4: Very high tolerance level, typically used in applications requiring high precision, such as machine tool spindles.
  • P3: Intermediate precision grade offering P2 runout tolerances with P4 external tolerances
  • P2: Extremely high tolerance level, used in applications demanding exceptional precision, such as precision instruments.
  • • "E" or "W" or "CC" or “ECJ” or “BJP” are often used in spherical roller bearings to indicate steel cage design.
  • • "CA" or "MB" or “M” or “ECM” or “MP” or “L1” indicates bearing has a machined brass cage, which provides high strength and improved resistance to wear and fatigue.
  • • “T” or "TN" or "TV" or “ECP” or “TVP” indicate that the bearing has a polyamide (nylon) cage. Polyamide cages are lightweight, provide good heat resistance, and offer low friction characteristics.
  • • "K" is commonly used in tapered roller bearings and indicates that the bearing has a tapered bore. It allows for easy mounting and dismounting by using an adapter sleeve or withdrawal sleeve.
  • • "W33" typically refers to a bearing with a lubrication groove and three lubrication holes in the outer ring. This feature is commonly found in spherical roller bearings.
  • • "RS" or "DDU" or "VV" or "2RS" or “LLB”, or "LLU" indicates that the bearing has one or two rubber seals on the outer ring, respectively. The seals help to protect the bearing from contaminants and retain lubrication.
  • • "Z" or "ZZ" or "2Z": These suffixes indicate that the bearing has one or two metal shields on the outer ring, respectively. The shields provide protection against contaminants but do not provide a complete seal like rubber seals.
  • • "NR" or "N" indicates outer ring groove with or without snapring respectively.
  • •Contact Angles:
    • A/A5/ AC – 25 Degrees
    • C – 15 Degrees
    • B – 40 Degrees
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