Timken Industrial Seal Catalog

Relationship Between RPM, FPM and Shaft Diameters
Oil Seals Appendix E – Surface Speed Chart
10000
9000
8000
7000
6000
5500
5000
4500
4000
3500
3000
2500
2000
1500
1000
900
800
700
600
550
500
450
400
350
300
250
200
150
100
RELATIONSHIP BETWEEN RPM, FPM AND SHAFT DIAMETER
An approximate method of calculating
peripheral speeds is as follows: Shaft
Diameter (in inches) x RPM x 0.26.
FPM
To convert RPM to FPM, set straight edge on known factors (shaft diameter
and RPM). The center line will indicate FPM. As illustrated above, a 1 inch
shaft turning 3500 RPM’s converts to 900 FPM.
RPM SHAFT DIA.
10000
9000
8000
7000
6000
5000
4000
3000
2500
2000
1500
1000
900
800
700
600
500
400
300
250
200
150
100
90
80
70
60
50
40
30
25
20
15
10
10
9
8
7
6
5
4
3
2.5
2
1.5
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.25
0.2
0.1
7 1/2
6 1/2
5 1/2
4 1/2
3 3/4
3 1/2
3 1/4
2 3/4
2 1/2
2 1/4
1 7/8
1 3/4
1 5/8
1 1/2
1 3/8
1 1/4
1 1/8
15/16
7/8
13/16
3/4
11/16
5/8
9/16
1/2
7/16
3/8
11/32
5/16
9/32
1/4
7/32
3/16
5/32
1/8
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