Bearing number

A bearing number is composed of a basic number and a supplementary code, denoting bearing specifications including bearing type, boundary dimensions, running accuracy, and internal clearance.
Bearing numbers of standard bearings corresponding to JIS B 1512 "rolling bearing boundary dimensions" are prescribed in JIS B 1513.
As well as these bearing numbers, JTEKT uses supplementary codes other than those provided by JIS.
Among basic numbers, bearing series codes are listed in Table 6-1 Bearing series code, and the composition of bearing numbers is described in Table 6-2 Bearing number configuration, showing the order of arrangement of the parts.

[Examples of bearing numbers]

Table 6-1 Bearing series code

[Notes]
1) Width series codes in parentheses are omitted in bearing series codes.
2) These are bearing series codes customarily used.
3) Nominal outer ring width series (inner rings only are wide).
4) Besides NU type, NJ, NUP, N, NF, and NH are provided.

Table 6-2 Bearing number configuration

Basic number			Supplementary code
Bearing series code	Bore diameter No.	Contact angle code	Internal design code, cage guide code	Shield/seal code	Ring shape code, lubrication hole/groove code	Material code, special treatment code	Matched pair or stack code, cage guide code	Internal clearance code, preload code	Spacer code	Cage material/type code	Tolerance code (JIS)	Grease code
Codes descriptions 68 Deep groove ball bearing 69 60 (For standard bearing code, refer to Table 6-1)	Codes descriptions /0.6 0.6mm (Bore diameter) 1 1 /1.5 1.5 2 2 /2.5 2.5 3 3 9 9 00 10 01 12 02 15 03 17 04 20 /22 22 05 25 /28 28 06 30 /32 32 07 35 96 480 /500 500 /530 530 /2500 2500 á Bore diameters (mm) of bearing in the bore diameter range 04 to 96 can be obtained by multiplying their bore diameter number by five.	Codes descriptions Angular contact ball bearing A (omitted) 30° AC 25° B 40° C 15° CA 20° E 35° Tapered roller bearing B (omitted) Less than 17° C 20° D 28° 30' DJ 28° 48' 39"	Codes descriptions R High load capacity (Deep groove ball bearing, cylindrical roller bearing, tapered roller bearing) G Equal stand-out is provided on both sides of the ring of angular contact ball bearing (In general, C2 clearance is used) GST Angular contact ball bearing described above with standard internal clearance provided J Tapered roller bearing, whose outer ring width, contact angle and outer ring small inside diameter conform to ISO standards Spherical roller bearings R With convex asymmetric rollers and machined cage RH With convex symmetric rollers and pressed cage RHA With convex symmetric rollers and one-piece machined cage V Full complement type ball or roller bearing (with no cage)	Codes descriptions (Shield) Z one side Fixed shield ZZ both sides Fixed shield ZX one side Removable shield ZZX both sides Removable shield (Non-contact seal) RU one side 2RU both sides ZU one side 2ZU both sides (Contact seal) RS one side 2RS both sides RK one side 2RK both sides U one side UU both sides (Extremely light contact seal) RD one side 2RD both sides	Codes descriptions K Inner ring tapered bore provided （1：12） K30 Inner ring tapered bore provided （1：30） N Snap ring groove on outer ring outside surface provided NR Snap ring groove and locating snap ring on outer ring outside surface provided NY Creep prevention synthetic resin ring on outer ring outside surface provided SG Spiral groove on inner ring bore surfaceprovided W Lubrication hole and lubrication groove on cylindrical roller bearing outer ring outside surface provided W33 Lubrication hole and lubrication groove on spherical roller bearing outer ring outside surface provided	Codes descriptions Code not given High carbon chrome bearing steel E Case carburizing steel F Case carburizing steel H Case carburizing steel Y Case carburizing steel ST Stainless steel SH Special heat treatment (Dimension stabilizing treatment) S0 Up to 150℃ S1 Up to 200℃ S2 Up to 250℃	Codes descriptions (Angular contact ball bearing) DB Back-to-back arrangement DF Face-to-face arrangement DT Tandem arrangement (Ball bearing) PA With outer ring guide cage (Roller bearing) Q3 With roller guide cage	Codes descriptions (Radial internal clearance for radial bearing) C1 Smaller than C2 C2 Smaller than standard clearance CN Standard clearance C3 Greater than standard clearance C4 Greater than C3 C5 Greater than C4 (Radial internal clearance for extra-small/miniature ball bearing) M1 0～5μm M2 3～8μm M3 5～10μm M4 8～13μm M5 13～20μm M6 20～28μm (Radial internal clearance for double-row angular contact ball bearing) CD2 Smaller than standard clearance CDN Standard clearance CD3 Greater than standard clearance (Deep groove ball bearing) CM Radial internal clearance for electric CT motor bearing NA Non-interchangeable cylindrical roller bearing radial internal clearance (C1NA to C5NA) （Preload for angular contact ball bearing） S Slight preload L Light preload M Medium preload H Heavy preload	Codes descriptions （Spacer width (mm) is affixed to the end of each code.） （Deep groove ball bearing） ＋ Inner and outer ring spacers provided （Angular contact ball bearing） / spacers provided /P Outer ring spacer provided /S Inner ring spacer provided （Cylindrical roller bearing, spherical roller bearing） ＋DP Inner and outer ring spacers provided ＋IDP Inner ring spacer provided ＋0DP Outer ring spacer provided	Codes descriptions （Pressed cage） // Steel sheet YS Stainless steel sheet （Machined cage） FT Phenol resin FY High-tensile brass casting FW High-tensile brass casting (separable type) (Molded cage) NG Polyamide FG Polyamide （Pin type cage） FP Carbon steel	Codes descriptions （JIS） Omitted Class 0 P6 Class 6 P6X Class 6X P5 Class 5 P4 Class 4 P2 Class 2	Codes descriptions A2 Alvania 2 AC Andok C B5 Beacon 325 SR Multemp SRL

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