The classification of bearings counts from left to right the first or the first and the second number together '6' means deep groove ball bearing (0 category) '4' means double row deep groove ball bearing (0 category)' 2' or '1' means self-aligning ball bearings (four numbers in total for the basic model) (category 1) '21', '22', '23' and '24' mean self-aligning roller bearings. (Type 3) 'N' means cylindrical roller bearings (including part of short cylindrical rollers and slender needle rollers) (Type 2) 'NU' inner ring without ribs. 'NJ' inner ring single rib. 'NF' outer ring single rib. 'N' outer ring has no ribs. 'NN' double row cylindrical roller, no rib on the outer ring. 'NNU' double row cylindrical rollers, inner ring without ribs. The length of the roller is at least 5 times the diameter size, which is called a needle roller bearing (4 types) 'NA' turning outer ring needle roller bearing 'NK' stamping case needle roller bearing 'K' needle roller and cage assembly, no inner and outer rings. '7' means angular contact ball bearing (category 6) '3' means tapered roller bearing (metric system) (category 7) '51', '52' and '53' means radial thrust ball bearing (five numbers in total for the basic model) (Category 8) '81' means thrust short cylindrical roller bearing (category 9) '29' means thrust spherical roller bearing (category 9). Dynamic ring size and tolerance GB-T308-2002 Rolling bearing steel ball GB-T309-2000 Rolling bearing needle roller GB-T4661-2002 Rolling bearing cylindrical roller GB-T4662-2003 Rolling bearing rated static load GB-T6391-2003 Rolling bearing rated dynamic load and rated National standard for life bearings GB-T305-1998 Dimensions and tolerances of snap grooves and snap rings on the outer ring of rolling bearings GB-T308-2002 Steel balls for rolling bearings GB-T309-2000 Needle rollers for rolling bearings GB-T4661-2002 Cylindrical rollers for rolling bearings GB -T4662-2003 Rolling bearing rated static load GB-T6391-2003 Rolling bearing rated dynamic load and rated life JB-T3034-1993 Rolling bearing oil seal antirust packaging JB-T3573-2004 Rolling bearing radial clearance measurement method JB-T6639-2004 Rolling bearing parts Skeleton nitrile rubber sealing ring technical conditions JB-T6641-2007 Rolling bearing residual magnetism and its evaluation method JB-T6642-2004 Rolling bearing parts roundness and waviness error measurement and evaluation method JB-T7048-2002 Rolling bearing parts engineering plastic cage JB -T7050-2005 Rolling bearing cleanliness evaluation method JB-T7051-2006 Rolling bearing parts surface roughness measurement and evaluation method JB-T7361-2007 Rolling bearing parts hardness test method JB-T7752-2005 Rolling bearing sealed deep groove ball bearing technical conditions JB-T8196- 1996 Rolling body residual magnetism of rolling bearings and its evaluation method JB-T8571-1997 Dustproof, grease leakage and temperature rise performance test procedures for sealed deep groove ball bearings of rolling bearings JB-T8921-1999 Inspection rules for rolling bearings and their parts JB-T10336-2002 Rolling bearings and Supplementary technical conditions for its parts JB-T50013-2000 Rolling bearing life and reliability test procedures Small dots are separated from the base code. GS.——Thrust cylindrical roller bearing race. Example: GS.81112. K.——Assembly of rolling element and cage. Example: Thrust cylindrical roller and cage assembly K.81108R - Bearings without separable inner or outer rings. Example: RNU207 - NU207 bearing without inner ring. WS——Thrust cylindrical roller bearing shaft washer. Example: WS.81112.——Internal Design——Outline Dimensions and Deformation Design——Seal——Cage——Tolerance——Gap—Heat Treatment——Special Design——Machine Tool Spindle Bearing——Low Noise and Saving Bearing— — Suffix code The suffix code is placed behind the basic code. When there are multiple sets of suffix codes, they should be arranged from left to right in the order of the suffix codes listed in the bearing code table. Some suffix codes are separated from the basic code by a small dot. Subsequent code - internal structure A, B, C, D, E - internal structure change example: angular contact ball bearing 7205C, 7205E, 7205B, C - 15 ° contact angle, E - 25 ° contact angle, B - 40 ° contact horn. Example: Cylindrical roller, spherical roller and thrust spherical roller bearings N309E, 21309E, 29412E—— Reinforced design, bearing load capacity increased. VH——Full complement cylindrical roller bearing with self-locking rollers (the diameter of the compound circle of the roller is different from that of the standard bearing of the same type). Example: NJ2312VH. Subsequent code - bearing dimensions and external structure DA - separable double row angular contact ball bearing with double half inner ring. Example: 3306DA. DZ——Cylindrical outer diameter roller bearing. Example: ST017DZ. K——Bearing with tapered bore, taper 1:12. Example: 2308K. K30-tapered bore bearing, taper 1:30. Example: 24040 K30 . 2LS——Double row cylindrical roller bearing with double inner ring and dust cover on both sides. Example: NNF5026VC.2LS.V——Internal structure change, double inner ring, with dust cover on both sides, full complement double row cylindrical roller bearing. N——A bearing with a stop groove on the outer ring. Example: 6207N. NR——A bearing with a snap groove and a snap ring on the outer ring. Example: 6207 NR. N2———A four-point contact ball bearing with two stop grooves on the outer ring. Example: QJ315N2. S——A bearing with lubricating oil grooves and three lubricating oil holes in the outer ring. Example: 23040S. Spherical roller bearings with bearing outer diameter D ≥ 320mm are not marked with S. X——The overall dimensions meet the requirements of international standards.
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