Bearing Size Chart

Gives the bore, outside diameter and width of deep-groove ball bearings from the bearing number, finds bearings that fit measured dimensions, and explains how a number such as 6204-2RS C3 is read. Use it when replacing a bearing whose number you can read, or one you can only measure.

How to use

1. Type the number from the bearing's side face under "Bearing number", for example 6204ZZ; the bore, outside diameter and width appear with an explanation of each part of the number.
2. If the number is unreadable, enter the dimensions you can measure under "Find by dimensions"; matching and nearby bearings are listed.
3. Choose a series (618, 619, 60, 62, 63, 64) to see its full table in mm and inches, and use "Print" if you need it on paper.

How it works

• Bore code rule: 00 = 10 mm, 01 = 12 mm, 02 = 15 mm, 03 = 17 mm; from 04 the bore is the code × 5. Bores after a slash are in mm (62/22 = 22 mm), and one digit after the series is the bore of a small bearing (608 = 8 mm).
• Dimensions follow ISO 15. Each row agrees in at least two of the SKF, NSK and Timken catalogues; bores up to 200 mm are listed.
• Suffixes such as ZZ, 2RS and C3 do not change the dimensions. Their letters differ between makers. Load ratings, speeds and life are not covered.

Questions and answers

What size is a 6204 bearing?

Bore 20 mm, outside diameter 47 mm, width 14 mm. 6204ZZ and 6204-2RS have the same dimensions.

What do ZZ and 2RS mean on a bearing?

ZZ (or 2Z) means metal shields on both sides; 2RS means contact rubber seals on both sides. C3 means a larger internal clearance than normal.

Is a 6805 the same as a 61805?

Yes. Japanese makers write the 618 and 619 series as 68 and 69, so 6805 and 61805 are both 25 × 37 × 7 mm.

How do I find a bearing from its measurements?

Measure the bore, outside diameter and width and enter them under "Find by dimensions". For example 20 mm and 47 mm give 6204; the width tells it apart from bearings with the same diameters.