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Hitork Gears & Drives

NBC Bearings 63XX to 631X series

NBC Bearings 63XX to 631X series

Rs. 264.00
Rs. 264.00
Sale Sold out

A ball bearing is a precision mechanical component designed to support rotating shafts and reduce friction by using rolling elements called balls. Its key parameters include the bore diameter, which determines the shaft size it fits onto, the outer diameter and width, which define its overall dimensions and housing fit, and the ball diameter and number of balls, which influence load capacity and performance. The pitch circle diameter sets the load path geometry, while the contact angle affects the bearing’s ability to handle radial and axial loads. Dynamic and static load ratings indicate how much load the bearing can safely support during operation or at rest, and the speed rating specifies the maximum rotational speed. Other important parameters include internal clearance for smooth operation, material and hardness for durability, cage design for ball separation and stability, and seals or shields for protection against contamination. Together, these parameters define the bearing’s load-carrying capacity, speed capability, precision, and service life.

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NBC Bearings 63XX to 631X series

Basic Geometric Parameters

These define the size and structure of the bearing:

ParameterDescriptionImportanceBore diameter (d)Inner diameter (shaft size)Determines shaft size compatibilityOuter diameter (D)Outer ring diameterFits into housingWidth (B)Bearing thicknessAffects load capacity and speedBall diameter (Dw)Diameter of rolling elementsInfluences load distribution and frictionNumber of balls (Z)Total balls in bearingMore balls = higher load capacity but more frictionPitch circle diameter (PCD)Diameter of circle passing through ball centersCritical for load path geometryContact angle (α)Angle between load line and radial planeAffects axial vs. radial load handlingInternal clearance (C)Total radial or axial internal playInfluences friction, heat, and preload

📏 2. Load and Performance Parameters

ParameterDescriptionImportanceDynamic load rating (C)Load that bearing can carry for 1 million revolutionsKey for fatigue lifeStatic load rating (C₀)Max load before permanent deformationKey for shock/low-speed loadsEquivalent dynamic load (P)Combined radial + axial load used in life calculationUsed in L10L_{10}L10​ life formulaAxial load capacityAbility to carry load along the shaftDepends on contact angleRadial load capacityAbility to carry load perpendicular to shaftHigher in deep groove bearingsSpeed rating (nₘₐₓ)Maximum operating RPMLimited by cage design, lubrication, heatLimiting speed (nₗᵢₘ)Recommended continuous speedBeyond this, lubrication and heat issues occurLife expectancy (L₁₀)Basic rating life (90% reliability)Calculated using L10=(CP)p×106L_{10} = \left(\dfrac{C}{P}\right)^p \times 10^6L10​=(PC​)p×106 revolutions