Selecting a bearing

1. Process of selecting

To select a ball bearing part number and specification properly, it is necessary to fully understand the required performance of the ball bearing by confirming the structures, dimensions, environment, and conditions of each application using the ball bearing. The process of selecting a ball bearing is shown below.

	Application conditions, environment, required performance Structure and function of equipment Application conditions (temperature, humidity, vibration, dust, etc.) Loads Dimension and material of shaft and housing RPM, Rotation precision, Rotation Ring Torque Noise Life Regulated substance
	Selecting Part Number Bearing material Bearing dimension Structure of shield/seal Retainer Load rating and life
	Tolerance and Grades Tolerance Measurement methods
	Deciding performance level Internal clearance Fits Design of shaft and housing Preload (preload and stiffness) Displacement Torque Vibration by forced rotation Noise Combination with plastics parts
	Selecting lubricant
	Handling

Application
Dimension	Shaft Diameter	φ precision(roundness Material( mm (Tolerance μm roughness μm) μm) )
	Housing Bore	φ precision(roundness Material( mm (Tolerance μm roughness μm) μm) )
	Housing Diameter	φ mm
	Bearing Span	mm
Rotation Spec	Rotating Ring	□ Inner Ring Rotation      □ Outer Ring Rotation
	Operation Condition	□ Continous min-1(rpm)
		□ Intermittent
		□ Back and forth
Application Condition	storing temperature and humidity	℃ %RH
	Application temperature and humidity	℃ %RH
	bearing temperature	℃
Load	radial direction	N(kgf)
	axial direction	N(kgf)	(Preload) N(kgf)
	preload method	□ Spring preload    □ Solid preload □ Duplex face to face    □ Duplex back to back
	□ Repeat    □ Vibration    □ Impact
	conditions:
Torque	□ Starting Torque    □ Running Torque		mN・m(gf・cm)
	conditions:
Noise	characteristics
Others	corrosion-resistant, drug-resistant, Magnetism, Food Safety