Identification Number The identification number of Machined Type Needle Roller Bearings consists of a model code dimen sions any supplemental codes and a classification symbol Examples are shown below Model code Supplemental code Classification symbol Dimensions NA 49 UU Type of bearing 05 C2 P6
Needle roller bearings are rotational motion bearings in which a thin needleshaped roller is incorporated into a rolling element They have a low crosssection height and high load capacity compared with ball bearings Being small needle roller bearings contribute to reducing overall machine size and are thus widely
Radial runout of assembled bearing outer ring Kea Assembled bearing outer ring face runout with raceway Sea Variation of outside surface generatrix inclination with outer ring reference face SD 33 Model number NA 02 C2P6 49 Example of identification number Bore diameter number Dimension series Model code
NA 49 NA 69 NA 48 TRI TAFI BRI GTR GBR GBRI GTRI Caged Needle Roller Bearings Guide Needle Roller Bearings Without inner ring With inner ring With two seals With one seal With one seal With two seals 120 130 140 NA 4924UU ─ ─ ─ ─ ─ ─ NA 4926UU NA 4928UU NA 4924U NA 4926U
Dimensional interchangeability only This does not imply interchangeable in all respects Koyo Prefix INA Prefix IKO Prefix Design 81 81 AZ Thrust AS AS AS Thrust AXK AXK NTB Thrust BK BK TLAM Drawn Cup GS GS GS Thrust HK HK TLA Drawn Cup JR IR LRT Solid Race K K KT Cage And Roller
