NTN - Cylindrical and Tapered Roller Bearings

Dimensions and Ratings
r
Wr
r
r
R
R
C F H
A C
D F
B X V
R
Z U
DIMENSIONS
The basic boundary dimensions (bore, outside
diameter, width) in the following tables conform to the
standards established by ABMA/ANSI.
A description of dimensions represented by various
letters is given below:
B Maximum bearing bore diameter. The minus
tolerance is given on page 79 76 and the range in
“Fitting Practice” section
D
Maximum bearing O.D. The minus tolerance is given
on page 79 76 and the range in “Fitting Practice” section
W Maximum bearing width. The minus tolerance is
given on page 79. 76
A
Maximum O.D. of the inner ring raceway
X
V
Z
U
Recommended maximum housing shoulder
diameter for plain outer rings
Recommended minimum shaft shoulder diameter
for ribbed inner rings
Recommended maximum housing shoulder
diameter for ribbed outer rings
Recommended minimum shaft shoulder diameter
for plain inner rings
Dimensions shown in tables are given in both inch and
metric units and are based on:
1 inch = 25.4 mm exactly
1 micrometer = 1m = 10 -6 m
1 micrometer = .001 mm
C
F
H
R
r
Minimum I.D. of the outer ring raceway
Maximum rib O.D. of the inner ring
Minimum rib I.D. of the outer ring
Maximum fillet on the shaft that the bearing corner
will clear
Maximum fillet in the housing that the bearing corner
will clear
LOAD RATINGS
The radial load ratings this in this catalog catalog are based are based on 3000 on
hrs 500 L10 hrs life L 10
at life 500 at rpm 33 1 ⁄3 or rpm 90 million or 1 million cycles cycles for either for
inner either orinner outeror ringouter rotation. ring To rotation. convert this To convert rating to 500 this
hrs rating L10to life 3000 at 33- hrs 1 /3 L 10
rpm life at or 500 1 million rpm cycles or 90 million basis,
multiply cycles basis, by 3.857. divide by 3.857.
The load ratings, dynamic and static, are shown in both
pounds and newtons, i.e.,
1 pound = 4.448 newtons
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