ABIS Miniature and Precision Ball Bearings
With bores of 0.6 to 90mm and precision grades to ABEC 7
Inch/Metric Bearing *
Tolerance *
Type *
For inch bearings tolerances are based on Section 3 of the AFBMA Standards for ABEC Class 1 and Section 12 for ABEC Class 3. Refer to Table 1. For metric series bearings up to 9mm outer diameter tolerances are based on AFBMA Standards as above. For diameters over 9mm they are based on ISO R492-R1648 tolerances Class P0, P6 and P5. Refer to Tables 1 & 2. N.B. Thin section bearings, Series E only, are available in tolerance Class P5.
Table 1 Bearings with bore sizes 0-0.375 inches, 0-18mm. Outside diameters 0-30mm
ABEC
Parameters
ISO
Unit 0.0001 Inch
Unit 0.001mm
Class 1
Class 3
Class 0
Class 6
Class 5
High
Low
Inner Ring Diameter
0
-3
Mean value of bore dm
-8
-7
-5
+1
-4
-2
Absolute value of bore d
+2
-10
3
2
Radial run out (max.)
10
6
5
-50
Width B
-120
-25
Width variation (max.)
Outer Ring Diameter
Mean value of OD (open) Dm
Absolute value of OD (open) D
Absolute value of OD (closed) D
-
4
15
8
+50
Flange diameter Df
+125
-50(1)
Flange width Bf
(1) Manufacturers tolerances
Table 2 Bearings with bore sizes 20-34mm. Outside diameter 31-80mm.
20-30
35-45
12
-6
+3
-13
-15
-9
-11
13
20
32-50
52-80
-14
+4
-17
+7
-18
+10
-23
+6
25
7
