1. NU: NU general belong to lead code, is one of the cylindrical roller bearing type, belongs to the inner circle no flange cylindrical roller bearing , such as NU203, etc

2. ECJ: this I didn't see , but I feel is belong to cylindrical roller bearing, may relative with retainer, should be strengthen retainer mean!

3. M: general belong to rear code, can represent of the bronze, is bearing retainer material is copper, such as: 22220. M or 6040. M this M is bearing retainer is copper, but there is an exception, the expression method of each manufacturer are very different, according to each brand of bearing manufacturer named method, just know what is mean!

4. H: H is belong to lead code, the general said the meaning of stainless steel, and Japan stainless steel SS mean the same, such as H 608 ZZ!

5.2 Z: 2 Z is ZZ, this is commonly said deep groove ball and angular contact type bearings, it means the bearing secret recipe way is to use: dust cover sealing, and you may encounter RS or 2 RS is the meaning of the rubber sealing ring, Z and RS is big sealing mean, 2 Z and 2 RS is double sealed mean!

6.N: N general for rear code, use more in deep groove ball , says bearing outer ring side with a groove

7. NJ: and NU, are the cylindrical roller bearing type, but NJ is inner circle single flange cylindrical roller bearing, NU is no inner circle!

8. ECM: the ECM is rear code, general motor bearings  have this code, this kind of bearing the price also higher than ordinary, such as 6204 ECM.

9. 2 RS: 2 RS is rear code, is a seal method of bearing, both sides are rubber seal, can consult 2 Z !

10. CC/W33: there are two parts to say, the first: CC is TieBao mean, general is to the aligning roller bearing , one retainer for TieBao, another retainer is copper, with CA , the second: W33 also is to the aligning roller bearing, is the model outer ring with lubrication groove and three widely distributed oil hole.

 
11. K: this K is the meaning of the taper, always bearing type with K is  mean taper, if only appear K, so the taper is K=1:12, if you see a model with K30 behind, so this K30 is the taper 1:30!



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