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Spindle bearings are single row angular contact roller bearings, with solid inner and outer rings and ball and cage assemblies with solid window cage. The bearings are available in open and sealed designs.
HCB72-RSD-2RSD are sealed on both sides. They are greased and are maintenance free.
High Speed spindle bearings HSS70 and HSS719 have smaller steel balls and the ceramic version HCS70 & HCS719 are also available. These four have high speeds & lower friction and heat generation. They have an extended operating life. The bearings are sealed on both sides.
The internal diameter of the bearing is known as ‘d’ and is measured and known as the internal diameter.
The outside diameter is know generally as the external diameter and denoted as ‘D’.
The width of the bearing is denoted as ‘B’ and is the measured width of a standard bearing.
These measurements will help us select the correct bearing size you will need. They make up the bearing code.
Lets look at an example bearing code 7205-B-TVP this is a commonly used bearing.
The 7205 has d inside diameter that is 25mm D outside diameter of 52mm and B dimension of 15mm. This information will be taken from our charts.
C Contact angle 15 deg.
E Contact angle 25 deg.
T Solid window cage made from hard plastic or fabric.
UL Universal design for fitting in pairs.
2RSD Spindle bearings with seals on both sides.
Bearing sets Universal bearings have the same bore and outside diameter are available in sets. They can be used in any arrangement and have a slight preload. They have the following Suffix.
Angular contact ball bearing single row.
Single row angular contact ball bearings as its name implies, the balls make contact with the sides of the running tracks, instead of with the bottom as in the deep grove ball bearing. The points of contact do not, therefore, lie in a direction perpendicular to the axis of the shaft, and this feature allows higher thrust load. The bearing can be used to deal with journal and thrust load in one direction. Single row angular contact bearings can be used in pairs to adjust excessive slackness and to keep the balls in the correct position.
The bearings are self-retaining units with solid inner and outer rings and ball cage made from polyamide, sheet metal or brass. The axial load carrying capacity is dependent on the contact angle. The larger the angle the higher the load the bearing can handle.
UA Universal design for fitting in pairs with small axial internal clearance.
UO Universal design for fitting in pairs clearance free.
2RS Contact seals on both sides.
The last part of our code denotes the bearing has a modified internal construction with a solid cage glass fibre.
How to order a Bearing and select Bearing code (part 1).
Deep Groove ball bearings single row open or closed.
You may need to identify a bearing due to wear and tear. All bearing use references that should be marked on the bearing which can be used to order but if they are not visible the following dimensions will be required to select the correct replacement.
The width of the bearing is denoted as ‘B’ and is the measured width of a standard bearing. On taper bearings this is known as dimension ‘T’.
Lets look at an example bearing code 6205 2RS1C3 this is a commonly used bearing.
The 6205 has d inside diameter that is 25mm D outside diameter of 52mm and B dimension of 15mm. This information will be taken from our charts.
The bearings also has a seal there can be a number of variants.
The last part of our code denotes the class of the internal clearance. We have a C3 code which means that the bearing has room for expansion. This C3 clearance will be used in applications were a cold start up may cause the balls to heat up quickly, the heat needs to go somewhere. Some will pass through the outer race to the inner race and to the shaft, this causes expansion and without the clearance would lead to bearing failure.
C4 Greatest clearance from standard.