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Bearing data – general + 20 + 27 HT.. Special grease for high temperat-ures (up to H Reduced tolerance for the inside diameter of the cage and roller assembly. The figures following the letter H indicate the tolerance limits in µm, e.g. H + 130 °C); the two figuresfollowing HT identify the actual grease IS Bearing with lubrication hole(s) inthe inner ring; a figure following ISindicates the number of holes

Needle roller bearings (4703 /IE) - 5564 Supplementary designations

ISR Bearing with annular groove andlubrication hole(s) in the inner ring; a figure following ISR indicates the number of holes JPC Profiled, roller guided pressed sheetsteel cage. Different designs areidentified by a figure, e.g. J1PC The complete designation for a needle rollerbearing product consists of the basic desig-nation, which identifies bearing type andsize, as well as any supplementary designa-tions in the form of suffixes. These suffixes identify design features which differ from the original standard design. The featuresare divided into groups and when more thanone feature is to be identified, the appropri-ate suffixes appear in a given order. Those suffixes which are commonly used to identi-fy certain features of SKF needle roller bear-ings are explained in the following. JPCS Welded JPC cage, example: K 100 × 108 × 30 ZWJPCS M./M. Diameter tolerance of needle rollers(e.g. M2/M4 – diameter tolerance − 2 to − 4 µm) MT.. Special grease for moderate tem- AS Bearing with lubrication hole(s) inthe outer ring; a figure following ASgives the number of holes ASR Bearing with annular groove andlubrication hole(s) in the outer ring;a figure following ASR gives the number of holes BF Needle roller with flat ends BIR Profiled inner ring raceway C2 Radial internal clearance smallerthan Normal C3 Radial internal clearance greaterthan Normal peratures (up to + 110 °C); the twofigures following MT identify the actual grease N/M. Diameter tolerance of needle rollers(e.g. N/M4 – diameter tolerance 0 to C4 Radial internal clearance greaterthan C3 − 4 µm) D Changed internal design of bearingof same type and size as original.Generally dropped after a certainchangeover period, but may be retained where variants of the same type and size of bearing have to bedistinguished PP Seals at both sides of a support roller or cam follower P4 Dimensional and running accuracyto ISO tolerance class 4 specifica-tions (better than P5) DS Split needle roller and cage assembly P5 Dimensional and running accuracyto ISO tolerance class 5 specifica-tions (better than P6) DSTN DS + TN EGS Inner ring with non-directionallyground raceway P6 Dimensional and running accuracyto ISO tolerance class 6 specifica-tions (better than Normal) FMA M-profile machined steel cage, outer ring centred P62 P6 + C2 FPA Window-type steel cage (from singleblank, with punched or reamedpockets), outer ring centred P63 P6 + C3 RS Rubbing seal at one side of bearing .2RS Rubbing seals at both sides of bearing GP Noise tested bearing S Matched bearings for an equal distribution of radial load. A figure preceding the S indicates the number of bearings 24