HOW TO IDENTIFY BEARING SIZE AND TYPE

BEARING IDENTIFICATION NUMBER

 

“WHAT ARE THEY”?

 

A GUIDE TO DECODE SIZE AND TYPE

  There are simple ways to know the bearing designation or kind, a little knowledge can help in understanding the type or kind that u need. The bearings are identified by the number pattern which in most cases gives the information of size and type, also the cage, and the groove can also be identified by the alphanumeric code.  

DECODING THE KIND AND INNER SIZE

  Another method is to look at the number on the bearing itself for ex 6205zz.The “6” or the first number determines the bearing type which is ball bearing series. The last two numbers determines the inner size, to get the size multiply the last two numbers by 5 as a standard rule in this case 05 * 5= 25 mm.   Another example would be 22216, the first number “2” tells us that it is a spherical roller bearing and to get the inner size we multiply the last two numbers by 5,  (16 * 5) = 80mm.   Many bearings have similar inner sizes such as “6205” size is 25*52*15, “3205” size is 25*52*20.6, in this example we see the last numbers or diameter are different 15 contrast with 20.6 but the inner size is similar which is 25 therefore a little knowledge about the initial number is important which will give us an indication of the type.   Also if the last number is less than 04 then the multiplication formula cannot be applied for ex “6203” the inner size is 17mm as a rule of thumb less than 04 inner sizes are given below.  
NUMBER INNER  (MM)
6200 10
6201 12
6202 15
6203 17
 

TABLE TO DETERMINE THE BASIC KIND OR TYPE

 
BALL BEARING 0, 1, 2, 3,  4, 5, 6,7, UC
TAPPER ROLLER LM, HM, 1, 2, 3, 5, 7
SPHERICAL ROLLER 222, 23, 24, 29
CYLINDRICAL N, NU, NJ, NF, NUP
PILLOW BLOCK P, F, FL, T, FC, SN
ADAPTER SLEEVES H, HE
 

MEANING OF SUFFIX

 
BALL BEARING SUFFIX:
 
LLU, 2RS, LLB(NTN), DDU(NSK) RUBBER SEAL
ZZ STEEL SEAL
C3, C4 HIGH CLEARANCE
 
SPHERICAL ROLLER SUFFIX :
 
MB BRASS CAGE
CC STEEL CAGE
W33 OIL GROOVE
 
CYLINDRICAL ROLLER PREFFIX:
 
NJ ONE SIDE LOCK
NU FREE MOVEMENT BOTH SIDE
NUPK ONE SIDE PLATE
N OUTER RING
 
CYLINDRICAL ROLLER SUFFIX:
 
ECJ
ECP POLYAMIDE CAGE
EM BRASS CAGE
 
– By Shamoon Sharif

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