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plaquette MACHLINE - Ntn-snr.com

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Tolerances and precision classes<br />

Ring tolerance<br />

Spindle precision in rotation has a direct influence<br />

on machining precision. SNR manufactures bearings<br />

in very high precision class P4S and super<br />

precision class ISO 2.<br />

Inner ring<br />

Tolerances in µm<br />

Bore (d) in mm<br />

Exclusive 6 10 18 30 50 80 120 150 180<br />

Inclusive 10 18 30 50 80 120 150 180 250<br />

Tolerances Symbol (1)<br />

Tolerance<br />

on mean<br />

∆ dmp<br />

ISO 4<br />

0 0 0 0 0 0 0 0 0<br />

-4 -4 -5 -6 -7 -8 -10 -10 -12<br />

diameter 0 0 0 0 0 0 0 0 0<br />

ISO 2<br />

-2,5 -2,5 -2,5 -2,5 -4 -5 -7 -7 -8<br />

Roundness<br />

Series 719 ISO 4 4 4 5 6 7 8 10 10 12<br />

max. Vdp ISO 2 2,5 2,5 2,5 2,5 4 5 7 7 8<br />

Series 70-72<br />

ISO 4 3 3 4 5 5 6 8 8 9<br />

ISO 2 2,5 2,5 2,5 2,5 4 5 7 7 8<br />

Taper<br />

max. Vdmp<br />

ISO 4 2 2 2,5 3 3,5 4 5 5 6<br />

ISO 2 1,5 1,5 1,5 1,5 2 2,5 3,5 3,5 4<br />

Radial ISO 4 2,5 2,5 3 4 4 5 6 6 8<br />

max. K ia<br />

run-out<br />

ISO 2 1,5 1,5 2,5 2,5 2,5 2,5 2,5 5 5<br />

Face run-out ISO 4 3 3 4 4 5 5 6 6 7<br />

max. S d<br />

with respect to bore<br />

ISO 2 1,5 1,5 1,5 1,5 1,5 2,5 2,5 4 5<br />

Raceway run-out ISO 4 3 3 4 4 5 5 7 7 8<br />

max. S<br />

with respect to face<br />

ia ISO 2 1,5 1,5 2,5 2,5 2,5 2,5 2,5 5 5<br />

Tolerance on ISO 4 0 0 0 0 0 0 0 0 0<br />

∆ Bs<br />

bearing width<br />

ISO 2 -40 -80 -120 -120 -150 -200 -250 -250 -300<br />

Alignment ISO 4 2,5 2,5 2,5 3 4 4 5 5 6<br />

of faces<br />

max. VBs<br />

ISO 2 1,5 1,5 1,5 1,5 1,5 2,5 2,5 4 5<br />

(1) Symbols for tolerances <strong>com</strong>ply with standard ISO 492<br />

56

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