Structures of Machined Type Needle Roller Bearings Outer ring Cage Needle roller Outer ring Cage Needle roller Inner ring Outer ring Needle roller Seal Cage Outer ring Malletshaped roller Stop ring NA49・TAFI GTR RNA49…UU・TAF…UU RNA49・TAF D2 ○Machined Type Caged Needle Roller Bearings
raceway surface a compact design is possible Structures of Machined Type Needle Roller Bearings Outer ring Cage Needle roller Outer ring Cage Needle roller Inner ring Outer ring Needle roller Seal Cage Outer ring Malletshaped roller Stop ring NA49・TAFI GTR RNA49…UU・TAF…UU RNA49・TAF
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 NA49 NA49 Solid Race NA69 NA69 NA69 Solid Race NAO NAO NAF Solid Race NATR NATR NAST Cam Follower NAXK NKX NAX Combination
Inner ring reference face runout with bore Sd 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 A30 Model number NA 02 C2P6 49 Example of identification number
RNA IKO Machined Type Needle Roller Bearings are bearings with a low sectional height and large load ratings The outer ring has high rigidity and can easily be used even for light alloy housings
7 000 7 000 LRTZ 222818 LRTZ 222831 25 NA 4905UU ─ NA 4905U ─ ─ NA 6905UU ─ NA 6905U 925 162 25 25 42 42 17 30 18 31 03 03 30 30 27 27 29 29 40 40 20 300 39 200 25 100 58 700 6 500 6 500 LRTZ 253018 LRTZ 253031 28 NA 49/28UU ─ NA 49/28U ─ ─ NA 69/28UU ─ NA 69/28U
Basic Dynamic Load Rating and Life A 17 Machined Type Needle Roller Bearings NA・TAFI・TRI・BRI D 1 Basic Static Load Rating and Static Safety Factor 40 40 20 300 39 200 25 100 58 700 6 500 6 500 LRTZ 253018 LRTZ 253031 28 NA 49/28UU ─ NA 49/28U ─ ─ NA 69/28UU ─ NA 69/28U 101 177
