How to order a Bearing and select Bearing code (part 3)

Spindle Bearings.

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.

The bearings have close tolerances and are used in situations that require accurate guidance and capable of high speeds. The bearings can handle axial as well as radial support. They are extensively used in machine tools. Contact angles available in 15 deg & 25 deg

Standard spindle bearings B70, B719 & B72 have steel balls

Spindle bearings HCB 70,  HCB719 & HCB 72 have ceramic balls

Spindle bearings  B70-2RSD, B719-2RSD, B72-2RSD, HCB70-2RSD, HCB719-2RSD &

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.

The bearings have the following design features denoted in the code by the following suffixes

C         Contact angle 15 deg.

E         Contact angle 25 deg.

H        high Preload

L         Slight Preload

M       Moderate preload

P4S    Tolerance class P4S

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.

DUL      2 bearings

TUL       3 bearings

QUL      4 bearings

 

How to order a Bearing and select Bearing code (part 2)

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.

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.

The bearings have the following design features denoted in the code by the following suffixes

B         Modified internal construction

JP       Sheet steel cage

MP    Solid brass cage

TVH   Solid cage glass fibre

EP      Solid cage glass fibre

TVP   Solid cage glass fibre

UA    Universal design for fitting in pairs with small axial internal clearance.

UL    Universal design for fitting in pairs with slight preload

UO   Universal design for fitting in pairs clearance free.

2RS   Contact seals on both sides.

The code on our example is now known as  7205-B-TVP

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 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. On taper bearings this is known as dimension ‘T’.

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 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.

2 RS1  has 2 Rubber seals

2RSR has  2 Rubber seals

DDU has 2 Rubber seals

2Z  has 2 Metal Shields

ZZ has 2 Metal Shields

The code on our example is now known as  6205 2RS1

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.

C2 Clearance less than standard

C3  Clearance greater than standard

C4 Greatest clearance from standard.

We are able to deliver to Leamington, Warwick, Coventry, Stratford upon Avon, Redditch, Southam, Kenilworth, Alcester, Solihull, Birmingham, Nuneaton, Banbury, Rugby and Daventry you can contact us on 01926 883939 or by email