What does R mean on a bearing?
Andrew Henderson
Updated on March 16, 2026
What does R mean on a bearing?
R – Ring with roller set.
What do ball bearing numbers mean?
The first digit indicates the width or height series (dimensions B, T or H). The second digit identifies the diameter series (dimension D). The last two digits of the basic designation identify the size code of the bearing bore. The size code multiplied by 5 gives the bore diameter (d) in mm.
What is the ID of a 6205 bearing?
The 6205 25 mm Ball Bearing Inner Dimension 25mm X Outer Dimension 52mm X Width 15mm is an open style ball bearing designed for high rotational speeds and high dynamic loads.
What does C4 mean on a bearing?
This is the most common type of bearing, and is the correct choice for the majority of applications. C4 – Refers to “greater than C3 clearance”. Not as common as C3, but often specified in small engine crankshaft bearings.
How do you read ball bearing size?
What size is a 6206 bearing?
DIMENSIONS
| d | 30 mm | Bore diameter |
|---|---|---|
| D | 62 mm | Outside diameter |
| B | 16 mm | Width |
| d1 | ≈ 40.36 mm | Shoulder diameter |
| D2 | ≈ 54.06 mm | Recess diameter |
What does C3 bearing mean?
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. C3 means the bearing has more clearance than standard.
What are the dimensions of a 6205 bearing?
DIMENSIONS
| d | 25 mm | Bore diameter |
|---|---|---|
| D | 52 mm | Outside diameter |
| B | 15 mm | Width |
| d1 | ≈ 34.35 mm | Shoulder diameter |
| D2 | ≈ 46.21 mm | Recess diameter |
What is C3 bearing rating?
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.
What is C5 in bearing?
C1 offers the least extra clearance, C5 offers the most extra clearance. The extra margin C3 offer is considered ‘normal’. Bearings with C3 are in fact the most commonly used. The radial play grades for non-assembled bearings are defined in ISO standards: C2 – Less clearance than normal.
What are the different types of R4 ball bearings?
R4-2RS, R4 2RS, R4 RS, R4RS, R4-ZZ, R4 ZZ, R4ZZ, R4 Z The R4-2RS and R4-ZZ is a 1/4 ball bearing that is found in many applications. The R4-2RS ball bearing has two contact rubber seals one on each side of the ball bearing. The R4-ZZ ball bearing has two non-contact metal shields one on each side of the ball bearing.
What is the difference between r4-2rs and r4-zz?
The R4-2RS and R4-ZZ is a 1/4 ball bearing that is found in many applications. The R4-2RS ball bearing has two contact rubber seals one on each side of the ball bearing. The R4-ZZ ball bearing has two non-contact metal shields one on each side of the ball bearing.
What type of bearings are used in golf clubs?
Bearings are 440C stainless steel for good corrosion resistance. A solid polymer lubricant surrounds the balls, eliminating the need for additional lubrication. Bearings are 440C stainless steel. Made to tight tolerances, these 440C stainless steel bearings combine speed and accuracy with corrosion resistance.
What material are the ball bearings made out of?
Bearings are 440C stainless steel for good corrosion resistance. A solid polymer lubricant surrounds the balls, eliminating the need for additional lubrication. Bearings are 440C stainless steel.
