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AS AN ESSENTIAL, LIFE-SUSTAINING BUSINESS, AST BEARINGS WILL REMAIN OPEN AMIDST THE CORONAVIRUS PANDEMIC.

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Spherical Plain Bearings - Tolerances

Spherical Plain Bearing tolerances apply to outer ring without surface treatment or splitting. Some bearings receive a phosphate coating and/or a MoS2 coating, both of which will add to the bearing’s OD dimension.

The outer rings become slightly out-of-round due to splitting. The roundness of the outer ring is restored once it is fitted in a housing bore produced in accordance with the specifications.

Please note that measurements taken of the outside diameter of the unfitted, split bearing cannot be used as the original actual values for the outside diameter.

Below are the various tolerances for inner and outer rings of spherical plain bearings supplied by AST Bearings and are organized by product series:

Tolerances for all AST Radial Spherical Plain Bearings (Except for Series GEBK­S, GEBJ­S, GEBJ­C, GEFZ­S, GEFZ­C, GEFZ­T, GEK­XS­2RS)

Inner Ring Tolerances

d
(mm)
 
Δ dmp
(µm)
Δ dmp*
(µm)
Vdp
(µm)
Vdmp
(µm)
Vdp*
(µm) 
Vdmp*
(µm)
Δ Bs
(µm)
Δ Bs*
(µm)
over
incl.
max 
min 
max 
min 
max 
max 
max 
max 
max 
min 
max 
min 
?
18
0
-8
18
0
8
6
18
14
0
-120
0
-180
18
30
0
-10
21
0
10
8
21
16
0
-120
0
-210
30
50
0
-12
25
0
12
9
25
19
0
-120
0
-250
50
80
0
-15
30
0
15
11
30
22
0
-150
0
-300
80
120
0
-20
35
0
20
15
35
26
0
-200
0
-350
120
180
0
-25
40
0
25
19
40
30
0
-250
0
-400
180
250
0
-30
46
0
30
23
46
35
0
-300
0
-460
250
315
0
-35
52
0
35
26
52
39
0
-350
0
-520
315
400
0
-40
57
0
40
30
57
43
0
-400
0
-570
400
500
0
-45
?
?
45
34
?
?
0
-450
?
?
500
630
0
-50
?
?
50
38
?
?
0
-500
?
?
630
800
0
-75
?
?
75
56
?
?
0
-750
?
?
*Tolerances apply to the GEEW-ES series only

Outer Ring Tolerances

D
(mm)
Δ Dmp (µm)
VDp
(
µm)
VDmp
(
µm)
Δ Cs
(µm)
over
 incl.
max
min
max
max
max
min
?
18
0
-8
10
6
0
-240
18
30
0
-9
12
7
0
-240
30
50
0
-11
15
8
0
-240
50
80
0
-13
17
10
0
-300
80
120
0
-15
20
11
0
-400
120
150
0
-18
24
14
0
-500
150
180
0
-25
33
19
0
-500
180
250
0
-30
40
23
0
-600
250
315
0
-35
47
26
0
-700
315
400
0
-40
53
30
0
-800
400
500
0
-45
60
34
0
-900
500
630
0
-50
67
38
0
-1000
630
800
0
-75
100
56
0
-1100
800
1000
0
-100
135
75
0
-1200
1000
1250
0
-125
190
125
0
-1300

Tolerances for AST Series GEBK­S

Inner Ring Tolerances

d
(mm)
Δdmp
(µm)
ΔBs
(µm)
over
incl.
max
min
max
min
?
6
12
0
0
-100
6
10
15
0
0
-100
10
18
18
0
0
-100
18
30
21
0
0
-100

Outer Ring Tolerances

D
(mm)
ΔDmp
(µm)
ΔCs
(µm)
over
incl.
max
min
max
min
10
18
0
-11
100
-100
18
30
0
-13
100
-100
30
50
0
-16
100
-100
50
80
0
-19
100
-100

Tolerances for AST Series GEBJ­S, GEBJ­C

Inner Ring Tolerances

d
(mm)
A dmp
(µm)
A Bs
(µm)
 over
 incl.
max
min
max
min
6
12
0
0
-100
6
10
15
0
0
-100
10
18
18
0
0
-100
18
30
21
0
0
-100

Outer Ring Tolerances

D
(mm)
Δ Dmp
(µm)
Δ Cs
(µm)
 over
 incl.
max
min
max
min
10
18
0
-11
0
-240
18
30
0
-13
0
-240
30
50
0
-16
0
-240
50
80
0
-19
0
-300

Tolerances for AST Series GEZ­S, GEFZ­C

Inner Ring Tolerances

d
(mm)
Δ dmp
(µm)
Δ Bs
(µm)
 over
 incl.
max
min
max
min
6
38
-13
130
-130
6
10
38
-13
130
-130
10
18
38
-13
130
-130
18
30
38
-13
130
-130

Outer Ring Tolerances

D
(mm)
Δ Dmp
(µm)
Δ Cs
(µm)
 over
 incl.
max
min
max
min
10
18
0
-18
130
-130
18
30
0
-18
130
-130
30
50
0
-18
130
-130

Tolerances for AST Series GEK­XS­2RS

Inner Ring Tolerances

d
(mm)
Δ dmp
(µm)
Δ Bs
(µm)
 over
 incl.
max
min
max
min
18
30
33
0
50
-110
30
50
39
0
50
-110
50
60
46
0
50
-140

Outer Ring Tolerances

D
(mm)
Δ Dmp
(µm)
Δ Cs
(µm)
 over
 incl.
max
min
max
min
50
80
30
11
0
-130
80
120
35
13
0
-130
120
150
40
15
0
-130

Key for Tolerance Tables

d
Bearing bore diameter, nominal
Δdmp
Single plane mean bore diameter deviation
Vdp
Bore diameter variation in a single radial plane
Vdmp
Mean bore diameter deviation
ΔBs
Deviation of a single width of the inner ring
B
Width of the inner ring, nominal
D
Bearing outside diameter, nominal
ΔDmp
Single plane mean outside diameter deviation
VDp
Outside diameter variation in a single radial plane
VDmp
Mean outside diameter variation
ΔCs
Deviation of a single width of the outer ring
C
Width of outer ring, nominal