Page 615 - Rollingbearings

Designation system

Group 4
4.1 4.2 4.3 4.4 4.5 4.6

Group 4.6: Other variants
VG052 Single split PES (polyethersulfone) cage

Group 4.5: Lubrication
SM.. Special grease, two numbers following identify the grease

Group 4.4: Stabilization
S0 Bearing or inner ring heat stabilized for operating temperatures ≤ 150 °C (300 °F)
S1 Bearing or inner ring heat stabilized for operating temperatures ≤ 200 °C (390 °F)
S2 Bearing or inner ring heat stabilized for operating temperatures ≤ 250 °C (480 °F)
S3 Bearing or inner ring heat stabilized for operating temperatures ≤ 300 °C (570 °F)

Group 4.3: Bearing sets, matched bearings
..S Matched bearings for an equal load distribution. The number preceding indicates the num-
ber of bearings, e.g. NK 50/25 TN/2S

Group 4.2: Accuracy, clearance, preload, quiet running
7
/SORT.. Tolerance grade of needle rollers of a needle roller and cage assembly, the numbers follow-
ing identify the actual limits in μm, e g /SORT-2-4
CN Normal radial internal clearance; only used together with an additional letter that identiies a
reduced or displaced clearance range
H Reduced clearance range corresponding to the upper half of the actual clearance range
L Reduced clearance range corresponding to the lower half of the actual clearance range
M Reduced clearance range corresponding to the two middle quarters of the actual clear-
ance range
P Displaced clearance range comprising the upper half of the actual clearance range plus
the lower half of the next larger clearance range
R Normal clearance range in accordance with the withdrawn DIN 620-4
The above letters H, L, M and P are also used together with the clearance classes C2, C3, C4
C2 Radial internal clearance smaller than Normal
C3 Radial internal clearance greater than Normal
C4 Radial internal clearance greater than C3
G2 Needle roller in accordance with ISO 3096 Grade 2
H.. Bearing without an inner ring and reduced inside diameter (under rollers) tolerance, the
numbers following indicate the tolerance limits in µm, e g H+27+20
M../M.. Diameter tolerance of needle rollers, e g M2/M4 indicates diameter tolerance –2 to –4 µm
N/M.. Diameter tolerance of needle rollers, e g N/M2 indicates diameter tolerance 0 to –2 µm
P5 Dimensional and geometrical tolerances to class P5
P6 Dimensional and geometrical tolerances to class P6
P62 P6 + C2
P63 P6 + C3
P6CNR P6 + CNR

Group 4.1: Materials, heat treatment

613