Series                                 Note:

NK           needle roller bearing without inner ring (light series)

NKS         needle roller bearing without inner ring (heavy series)

RNA49    needle roller bearing without inner ring ( size series49)

RNA 69   needle roller bearing without inner ring sizes series69  dual bearing race  RNA 6906

RNA 48    needle roller bearing without inner ring (size series 48)

NKI           needle roller bearing with inner ring(light series)

NkIS         needle roller bearing with inner ring(heavyseries)

NA49        needle roller bearing with inner ring(size series 49)

NA69        needle roller bearing with inner ring   sizes series69  dual bearing race  NA 6906

NA48        needle roller bearing with inner ring(size series 48)

RNA 49RS   needle roller bearing without  inner ring  one sided sealing

(size series 49)

RNA 49 2RS  needle roller bearing without  inner ring  doubled faced seaing (size series 49)

NA 49  RS     needle roller bearing without  inner ring  ,single sealing  (size series 49)

NA 49  2RS     needle roller bearing without  inner ring  doubled faced seaing (size series 49)

RNAO   needle roller bear  ing without  inner ring  capped edge

NAO         needle roller bearing with inner ring  but without capped edge

RNAV40   full complement needle roller bearing without  inner ring 

NAV40      full complement needle roller bearing  with  inner ring

Note:series of RNA6906 and NA6906 are treated as single raceAnd it is required to indicate when in orderbly.