What does C3 mean on a ball bearing?
Internal clearance
Internal clearance being C3 means that the bearing has room for expansion if needed between the races of the bearing, whilst holding the outer ring and moving the inner ring in a radial movement you will detect a little amount of play between the two rings.
How much clearance does a C3 bearing have?
The same bearing with a C3 fit will have about one thousandth of an inch clearance. This value is less than the diameter of a human hair! Internal clearances are also relative to the bearing’s bore size (the amount of radial play will increase as the bore size increases).
What is C2 C3 bearing clearance?
C2 C3 C4 bearings clearance is the gap between the bearing rolling elements and the inner and outer ring shells of the bearing. The size of the clearance (called the working clearance) during operation has an impact on the bearing’s rolling fatigue life, temperature rise, noise, vibration and other properties.
How much play should a ball bearing have?
Ideally, there should be zero residual radial play in the bearing to minimize ball skidding and reduce axial play (end play) so correct selection of the initial radial play is important.
What does ZZ mean on bearing?
ZZ bearing means that it has metallic shield on both the sides. Generally, it contacts the outer (Stationary) and doesn’t contact inner. To have a trade-off between preventing contamination ingress-ion into the bearing and frictional losses, shields or seals are used.
What is normal clearance of bearing?
Radial bearing clearance is broken down into several groups: C1, C2, CN, C3, C4, and C5. CN is the “normal clearance” and is defined by DIN 620 and ISO 5753 and is used for bearings in normal operating conditions; C1 and C2 class bearing have radial clearances smaller than CN.
What is the ABEC rating on bearings?
The ABEC rating system includes grades 1,3,5,7, and 9. The higher the ABEC rating, the tighter the tolerances are, making the bearing a more precision part. High precision and small tolerances are required for bearings to function at very high RPM, in products like high speed routers that must spin at 20 to 30,000 RPM.