Antifriction Bearings

you are talking about ball bearings

each digit of the bearing number has a significance and usually follows a standard (ABMA for US and DIN/ISO for european)

eg for your case refer

http://www.gizmology.net/bearings.htm

However selecting of the bearing is a bit complex factor.

You have to know the shaft (ie bearing bore size)

then the static and dynamic rating, L10 Life and based on that you select the standard bearings

go to any of the bearing sites

www.skf.com

www.fag.com

www.nsk.com

etc and select the bearing. Accordingly design the housing and proceed.

6307 zz or 6307 2z ?

In SKF:

63 is Single row, Deep groove ball bearings (first one or two digits refers the type of bearing)

07 stands for 35mm (last two digits, here 07 multiplied by 5 would give the inner diameter of inner race. To this diameter of the shaft a bearing is required for).

2z stands for shield on both sides (the shields to prevent dust and to contain grease)

Just a point on the 5x rule for the bore size, it only works from 04 numbers and upwards, below that 01 =12mm, 02 = 15mm and 03 = 17mm (not too many to remember).

This method of establishing bore size works for general catalogue bearings, other types like needle roller bearings and imperial bearings follow different rules.

Steve

Hello cool moody,

Here is some sites that might help:

• Buy 6307 Bearings UKSimplyBearings.co.uk/6307_Bearings Sealed And Open Types Buy Online Fast UK Delivery Only £1.50

  Google Checkout

• 6307ZZ Shielded Bearingswww.vxb.com Buy 6307ZZ ball bearings online wholesale prices, same day Shipping

  Google Checkout

  Tip: Save time by hitting the return key instead of clicking on "search"

  Search Results

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  www.skatebearings.com/6307-2RS-6308-ZZ.htm - 21k - Cached - Similar pages W1-04522 : BALL BEARING 6307 ZZ : S.K.F. : Nedis SKF / W1-04522 : BALL BEARING 6307 ZZ. ... Dustproof ballbearing 6307 ZZ. Brand: SKF type: 6307 ZZ dimensions: 35 x 80 x 21 ...
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Hello cool moody,

I searched for "bearing nomenclature" and found this site.

This explains what the numbers mean and further down the page is the meaning of the various letters, as in your case 'zz'.

I know this will answer the first part of your question. And other drawings and explanations on this site may help with the "how can I go about selecting bearings for different uses"?

http://www.gizmology.net/bearings.htm

Bearing Nomenclature

You can learn a lot about a bearing just from its part number.

A typical bearing is the 6203ZZ bearing. This part number can be divided into it's components:

6, Type code

2, Series

0, Bore

3, Suffix

ZZ, Double Shielded........... (Z, would be single shielded).

which means:

• Type Code
• Series
• Bore
• Suffix

The type code indicates the type of bearing. While each manufacturer uses their own numbers, there are a few numbers that could be considered standard in the industry.

If there is no fourth digit - for example, a 608 bearing, a common roller skate bearing - then the size is the last digit in millimeters.

The last letters indicate something special about the bearing. For example:

This will answer at least some of your questions.

Take care and good luck.................

Hello cool moody,

I forgot to include the search page:

http://www.google.com/search?hl=en&ei=FdyjSY--OtzFjAew3f2_BQ&sa=X&oi=spell&resnum=1&ct=result&cd=1&q=bearing+nomenclature&spell=1

There are not only ZZ but some other letters & numbers . What do they mean? can some body explain Please? typical example of such number is as follows. 6307ZZC3GJN, What does C3GJN mean please?