NSK bearings front symbol meaning

F— — Flange outer ring of deep groove ball bearings, Applicable to d less than 10 mm) Example: F605. HR— — Tapered roller bearings, high loads cases: HR30207J. NSK bearings rear symbol meaning A - — Interior design is different from standard bearings. A— — Angular contact ball bearing, the contact Angle of 30 degrees. A5— — Angular contact ball bearing, the contact Angle of 25 degrees Z, ZS - — A steel dust cover. ZZ ZZ - — The two sides with steel dust cover. D，DU— — A contact rubber seal. C1— — The centripetal bearing radial clearance, smaller than C2 clearance. C2— — The centripetal bearing radial clearance, smaller than standard clearance. CN（ Omitted) — — The centripetal bearing standard of radial clearance. C3— — The centripetal bearing radial clearance, bigger than standard clearance. C4— — The centripetal bearing radial clearance, bigger than C3 clearance. ZZ: deep groove ball bearing iron dust cover ( With 2 z) VV: non-contact rubber seal ( With 2 rz) DDU: contact rubber seal ( With 2 rs) K: self-aligning ball bearing with a taper hole ( Taper 1:12) K30: with a taper hole ( Taper 1:30) Spherical roller bearing: EA/C/CD for the steel cage CA/CAM: copper cage E4: on the outer ring groove ( Outside diameter side) S11: with oil hole temperature below 200 degrees K/K30: with a taper hole ( Taper 1:12/1:30) Ball screw support with bearing TAC: the contact Angle of 60 degrees SU/DU: universal modular single row/column 2 DB/DF/DT: combination/face to face/back to back in DBD/DFD/DTD: 3 combination DBB/DFF/DTT: four columns composite C10 / C9: PN7A / / light standard preload preload PN7B: standard precision/special control precision ( SU combination) Thrust angular contact ball bearing TYN: polyamide resin maintains a DB: back-to-back combination EL/m: micro/light pre-tightening P4A: special outside diameter difference in size, other to P4