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ENGINEERING

Bore and O.D. Coding

To better match machine tool bearings to spindles, Torrington currently offers Bottom/Top bore and O.D. coding as standard for angular contact superprecision bearings.

The code is a mark on the box label with the bore code shown above the O.D. code. The tolerances are split in half as shown in the figure below. If the bore and O.D. sizes fall in the half closest to nominal, this is

considered the top half and the set will be marked with a T/T. With a T/T code, the bore and O.D. tolerances would meet ABEC 9 requirements. If the bore and O.D sizes fall in the half farthest from the nominal, this is considered the bottom half and the set will be marked with a B/B. If the bore is in the top half and O.D. is in the bottom half, the set will be marked T/B and vice versa B/T.

T

B

TOTAL O.D. TOLERANCE

T

B

TOTAL BORE TOLERANCE

T

BORE

B

O.D.

BOTTOM/TOP BORE & O.D. CODING

NOMINAL O.D. DIMENSION

NOMINAL BORE DIMENSION

Offering bore and O.D. coding makes it easier to obtain the optimum recommended fits for spindles. Each bearing in a set is matched to within half the bore and O.D. tolerance to insure equal load sharing. It also

enables our customers to use pairs of bearings with same bore and O.D. codes to make triplex and quadruplex sets.

E26

102800

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