With the advent of NSK globalization, many domestic companies have begun to engage in the agency business of NSK bearings. However, because many agents do not have a certain bearing knowledge reserve, there are still many problems in customer marketing, including technical support. Therefore, in the direction of NSK's global development, we must pay attention to the standardization of NSK's globalization. Conduct management and training to the level required by professional NSK companies. NSK Bearing Suffix Encyclopedia (1) NSK Bearing Internal Structure A--Bearings whose internal design is different from the standard. A--Angular contact ball bearings, the contact angle is 30 degrees. A5--Angular contact ball bearings, the 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 bearing, the contact angle is 20 degrees. D--tapered roller bearing, the contact angle is 28 degrees. C, CA (with brass solid cage), CD (with stamped cage) - high load spherical roller bearings. E--high load cylindrical roller bearings. H - high load thrust spherical roller bearings. J--The small end diameter, angle and outer ring width of the outer ring raceway of the tapered roller bearing are consistent with the ISO regulations. (2) NSK bearing material g--ring, rolling body is carburized steel. H-- ferrule, the rolling body is stainless steel. (3) NSK bearing cage M-copper alloy solid cage. T--synthetic resin cage. W--stamping cage. V--no cage. (4) NSK bearing sealing ring, dust cover Z, ZS - one side with a steel plate dust cover. ZZ, ZZS--with steel plate dust cover on both sides. D, DU-one side with a contact rubber seal. DD, DDU--with contact rubber seals on both sides. V - one side with a non-contact rubber seal. VV--With non-contact rubber sealing rings on both sides. (5) NSK bearing ring shape K--conical hole, taper 1:12. K30--conical hole, taper 1:30. E--There are cutouts or oil holes on the ferrule. E4--There are oil grooves and oil holes on the outer ring. N--The outer diameter of the outer ring has a stop groove. NR--The outer diameter of the outer ring has a stop groove, a stop ring. (6) NSK bearing fit and liner DB-- NSK bearings are installed back to back in pairs. DF - installed in pairs face to face. DT - installed in pairs in series. +K--The outer ring is lined. +L--The inner ring is lined. +KL--Inner and outer rings are lined. (7) NSK bearing clearance C1-- NSK bearing radial bearing radial clearance, smaller than C2 clearance. C2--The radial clearance of the radial bearing is smaller than the standard clearance. CN (omitted) - radial standard clearance of radial bearings. C3--The radial clearance of the radial bearing is larger than the standard clearance. C4--radial clearance of the radial bearing, which is larger than the clearance of C3. C5--The radial clearance of the radial bearing is larger than the C4 clearance. CC1--cylindrical roller bearings (non-interchangeable) radial clearance, which is smaller than CC2 clearance. CC2--cylindrical roller bearings (non-interchangeable) radial clearance, which is smaller than the standard clearance. CC--cylindrical roller bearings (non-interchangeable) radial standard clearance. CC3--cylindrical roller bearings (non-interchangeable) radial clearance, which is larger than the standard clearance. CC4--cylindrical roller bearings (non-interchangeable) radial clearance, which is larger than CC3 clearance. CC5--cylindrical roller bearings (non-interchangeable) radial clearance, which is 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--Small, miniature ball bearing radial clearance standard clearance. 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--The radial clearance of deep groove ball bearings and cylindrical roller bearings for motors. CT--the radial clearance of cylindrical roller bearings for motors. (8) NSK bearing tolerance grade P0 (omitted) - the tolerance grade conforms to the 0 grade stipulated in the JIS standard. P6--The tolerance grade conforms to the 6th grade stipulated in the JIS standard. P6X--The tolerance level conforms to the 6X level specified in the JIS standard. P5--The tolerance grade conforms to the 5th grade stipulated in the JIS standard. P4--The tolerance grade conforms to the 4th grade stipulated in the JIS standard. P2--The tolerance grade conforms to the 2nd grade stipulated in the JIS standard. (9) NSK bearing special specification X26--The operating temperature is limited to below 150 degrees Celsius. X28--The use temperature is limited below 200 degrees Celsius. X29--The use temperature is limited below 250 degrees Celsius. S11--Spherical roller bearings, the operating temperature is limited below 200 degrees Celsius
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