A -- Bearings with internal design different from the standard.A -- angular contact ball bearing, the contact Angle is 30 degrees.A5 -- angular contact ball bearing, contact Angle is 25 degrees.B -- angular contact ball bearing, the contact Angle is 40 degrees.C -- angular contact ball bearing, the contact Angle is 15 degrees.C -- Tapered roller bearings, contact Angle of 20 degrees.D -- Tapered roller bearing, contact Angle is 28 degrees.C, CA (with brass solid cage), CD (with stamping cage) -- High load self-aligning roller bearings.E -- Cylindrical roller bearings with high load.H -- High load thrust self-aligning roller bearing.J -- Small end diameter, Angle and outer ring width of outer ring raceway of tapered roller bearings are in accordance with ISO regulations.(2) material G - ring, rolling body for carburizing steel.H -- Ring, rolling body is stainless steel.(3) Cage M -- copper alloy solid cage.T -- Synthetic resin cage.W -- Stamping cage.V -- No cage.(4) sealing ring, dustproof cover Z, ZS - one side with steel plate dustproof cover.

ZZ, ZZS -- two sides with steel plate dust cover.D, DU -- one side with contact rubber sealing ring.DD, DDU - contact rubber seals on both sides.V -- One side with non-contact rubber sealing ring.VV - Two sides with non-contact rubber sealing ring.(5) ring shape K -- conical hole, taper 1:12.K30 -- Taper hole, taper of 1:30.E -- There are cuts or oil holes in the ring.E4 -- with oil groove and oil hole on the outer ring.N -- outer ring outer diameter with stop groove.NR -- outer ring outer diameter with stop groove, stop ring.(6) fit and gasket DB -- back-to-back paired installation.DF -- Face-to-face paired installation.DT - series paired installation.+K -- outer ring with padding.+L -- inner ring with gasket.+KL -- inner and outer rings with padding.(7) Clearance C1 -- radial clearance of centripetal bearing, smaller than C2 clearance.C2 -- radial clearance of centripetal bearing, smaller than standard clearance.CN (omitted) -- radial standard clearance of centripetal bearings.C3 -- radial clearance of centripetal bearing, larger than standard clearance.C4 -- radial clearance of centripetal bearing, larger than C3 clearance.C5 -- radial clearance of centripetal bearing, larger than C4 clearance.CC1 -- Cylindrical roller bearings (non-interchangeable) with radial clearance, smaller than CC2 clearance.CC2 -- Cylindrical roller bearings (non-interchangeable) with radial clearance, smaller than standard clearance.CC - Cylindrical roller bearings (non-interchangeable) radial standard clearance.CC3 -- Cylindrical roller bearings (non-interchangeable) with radial clearance, larger than standard clearance.CC4 -- Cylindrical roller bearings (non-interchangeable) with radial clearance, larger than CC3 clearance.CC5 -- Cylindrical roller bearings (not interchangeable) with radial clearance, larger than CC4 clearance.MC1 -- Small, miniature ball bearing radial clearance, smaller than MC2 clearance.MC2 -- Small, miniature ball bearing radial clearance, smaller than MC3 clearance.MC3 -- Standard radial clearance for small and miniature ball bearings.MC4 -- Small, miniature ball bearing radial clearance, larger than MC3 clearance.MC5 -- Small, miniature ball bearing radial clearance, larger than MC4 clearance.MC6 -- Small, miniature ball bearing radial clearance, larger than MC5 clearance.CM -- Deep groove ball bearings for motor, radial clearance of cylindrical roller bearings.Ct -- Radial clearance of cylindrical roller bearings for motor.(8) Tolerance class P0 (omitted) -- The tolerance class conforms to the class 0 specified in the JIS standard.P6 -- Tolerance class conforms to JIS standard level 6.P6X -- Tolerance class in accordance with the JIS standard of 6X class.P5 -- The tolerance level conforms to the level 5 specified in the JIS standard.P4 -- The tolerance level conforms to the level 4 specified in the JIS standard.P2 -- The tolerance level is 2 as specified in the JIS standard.(9) Special specification X26 -- the operating temperature is limited to 150 ℃ or less.X28 -- Use temperature limit below 200 ° C.X29 -- Use temperature limit below 250 ° C.S11 -- Self-aligning roller bearing, operating temperature limited to 200