Machinery's Handbook, 31st Edition
2454
Ball and Roller Bearings Table 2. ABEC-1 and RBEC-1 Tolerance Limits for Metric Ball and Roller Bearings ANSI/ABMA 20-1987
Basic Inner Ring Bore Diameter, d
V dp , a max
mm
Diameter Series
K ia c max
Δ dmp b
Over
Incl.
7, 8, 9
0, 1
2, 3, 4
High
Low
2.5
10 18 30 50
10 10 13 15 19 25 31 38 44 50
8 8
6 6 8 9
0 0 0 0 0 0 0 0 0 0
10 10 13 15 20 25 30 40 50 60
− 8 − 8
10 18 30 50
10 12 19 25 31 38 44 50
− 10 − 12 − 15 − 20 − 25 − 30 − 35 − 40
80 120 180 250 315 400
11 15 19 23 26 30
80 120 180 250 315
a Bore diameter variation in a single radial plane. b Single plane mean bore diameter deviation from basic. (For a basically tapered bore, ∆
dmp refers
only to the theoretical small end of the bore.) c Radial runout of assembled bearing inner ring. Basic Outer Ring Outside Outerside Diameter, D V Dp , a max Open Bearings
Capped Bearings d
mm
Diameter Series
K ea c
Δ Dmp b
Over
Incl.
7, 8, 9
0, 1
2, 3, 4
2, 3, 4
High
Low max
6
18 30 50 80
10 12 14 16 19 23 31 38 44 50
8 9
6 7 8
10 12 16 20 26 30 38
0 0 0 0 0 0 0
15 15 20 25 35 40 45 50 60
− 8 − 9
18 30 50 80
11 13 19 23 31 38 44 50
− 11 − 13 − 15 − 18 − 25 − 30 − 35 − 40
10 11 14 19 23 26 50
120 150 180 250 315 400
120 150 180 250
… 0 … 0 … 0
315 70 a Outside diameter variation in a single radial plane. Applies before mounting and after removal of internal or external snap ring. b Single plane mean outside diameter deviation from basic. c Radial runout of assembled bearing outer ring. d No values have been established for diameters series 7, 8, 9, 0, and 1. Width Tolerances d Δ Bs a d Δ Bs a mm All Normal Modified b mm All Normal Modified b Over Incl. High Low Over Incl. High Low 2.5 10 0 − 120 − 250 80 120 0 − 200 − 380 10 18 0 − 120 − 250 120 180 0 − 250 − 500 18 30 0 − 120 − 250 180 250 0 − 300 − 500 30 50 0 − 120 − 250 250 315 0 − 350 − 500 50 80 0 − 150 − 380 315 400 0 − 400 − 630 a Single inner ring width deviation from basic. ∆ Cs (single outer ring width deviation from basic) is identical to ∆ Bs of inner ring of same bearing. b Refers to the rings of single bearings made for paired or stack mounting. All units are micrometers, unless otherwise indicated. For sizes beyond range of this table, see Standard. This table does not cover tapered roller bearings.
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