FreeRun Bearing dental drill bearings, also called handpiece bearings, are precision miniature ball bearing and can withstand high speed rotation. 

Basic model: SR144. S means stainless steel.

Inner ring and outer ring material: stainless steel 440(9Cr18)

Balls material: stainless steel and ceramic Si3N4(widely use)

Balls structure: radial balls(with letter “R”, Timken—DR)
Bngular contact balls(with letter “A”, Timken—DA)

Cage material: TL-TORLON(polyamide-imide)
Ti(textile laminated fiber reinforced phenolic)

Bearing speed: 400000rpm

Bearing tolerance: ABEC-7(P4)

Bearing structure: smooth, flanged, groove(stepped)

Ball numbers: standard is 7pcs balls, sometimes are 8pcs balls.

K1: angular contact bearing with stepped inner ring;
K2: angular contact bearing counter bored outer ring

1. It is best that the interference fit between bearing bore and turbine shaft is under 0.5um～1.5um. When putting burbine shaft into bearing bore,the pressure should be forced on the face of inner ring to avoide the damage of rollway and balls 
2. After fitting the bearing into tubine shaft they should be clear and instilled special lubricant.(Ethanol must not be used ) 
3. After high steam sterilized the Dental High Speed Handpiece should be jetted some lubricant into the air inlet before used and so that bearing could be used longer time. 
4. To keep operating stability, the proload spring stress of bearing should be controlled under 1.2±0.2N.

Welcome to visit and contact FreeRun for your dental drill bearings!