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SPHERICAL BEARING

[MOLD TYPE]

BM

Dimensions in mm

MINEBEA
Part
No.
B
D
W
0
-0.12
H
0
-0.24
O
Ref.
R1
±0.2
R2
±0.2
α
(deg.)
SDB
Ref.
No Load Rotational Breakaway Torque
N·m
Radial Clearance
mm
Radial Static Limit Load
kN
Axial Static Limit Load
kN
Dynamic Load
kN
Approx. Weight
g
BM10
10
19
9
6
13.1
0.5
0.8
12
16.0
0
0.03MAX
22.55
8.38
0.50
10
BM12
12
22
10
7
15.3
0.8
10
18.0
0.03MAX
{0.35kgf·cmMAX}
30.89
11.47
0.72
15
BM15
15
26
12
9
18.7
8
22.0
0.06MAX
{0.58kgf·cmMAX}
0.05MAX
46.77
17.35
1.15
25
BM17
17
30
14
10
21.2
1.0
10
25.0
59.03
21.86
1.36
40
BM20
20
35
16
12
23.7
9
29.0
72.47
26.87
1.58
62
BM25
25
42
20
16
29.3
7
35.5
0.11MAX
{1.15kgf·cmMAX}
103.26
38.24
1.93
102

Notes

Operating temperature range: -50∼+100
Dynamic Load Ratings: Cd
1.
Reversing & Alternating Load
Dynamic Load Ratings shall be reduced by half from the values given in the table under the use of reversing and alternating load condition.
2.
Factor of Operating Temperature and Sliding Speed
Dynamic Load Ratings shall be determined by formula below under the use of High-Temperature and Sliding-Speed condition.
Cdt·v=ft·fv·Cd
Cdt·v: Dynamic Load Ratings under the use of High-Temperature and Sliding speed.
ft: Coefficient of Temperature
fv: Coefficient of Sliding speed

Table1

Temp.
∼40
∼60
∼80
∼100
ft
1.0
0.95
0.8
0.6

Table2
Sliding Speed
m/min
∼0.3
∼0.4
∼0.5
∼0.6
∼0.7
∼0.8
∼0.9
∼1.1
∼1.5
∼2.5
fv
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1

Static Load Ratings: Cs
1.
Dynamic Load Ratings shall be reduced to one-thirds of the values given in the table under the use of that High-Load will be applied continiously or periodically and be reduced to one-sixth of the values given under Reversing and Alternating Load and Impact Load conditions.
2.
Factor of Operating Temperature
Dynamic Load Ratings shall be determined by formula below under the use of High-Temperature conditions.
Cs·t=ft·Cs
Cs·t: Dynamic Load Ratings under the use of High-Temperature condition.
ft: Coefficient of Temperature
Cs: Static Load given in the table

Table3

Temp.
∼30
∼40
∼60
∼80
∼90
∼100
ft
1.0
0.95
0.85
0.6
0.5
0.3

Thrust Load: Pt
Please use thrust load in the range, which does not exceed the thrust load (Table 1 application under temperature environment) from catalogue, and "1/3 of Actual radial Load."
Please consult MINEBEA for availability of bearings in this series.

Tolerances

Measure
range
Ball permitted tolerances
Race permitted tolerances
permitted tolerances of Ball width
permitted tolerances of Race width
Bm
B
Dm
D
W
H
Over
Under
Upper
Lower
Upper
Lower
Upper
Lower
Upper
Lower
Upper
Lower
Upper
Lower
10
0
-0.008
+0.002
-0.010
0
-0.120
0
-0.240
10
18
0
-0.008
+0.003
-0.011
0
-0.120
0
-0.240
18
30
0
-0.010
+0.003
-0.013
0
-0.009
+0.005
-0.014
0
-0.120
0
-0.240
30
50
0
-0.012
+0.003
-0.015
0
-0.011
+0.008
-0.019
0
-0.120
0
-0.240

Bm & Dm indicate averages of I.D. & O.D..