SELECTION EXAMPLE
* To choose a coupling for the connection of a 25 HP, electric motor 1750 RPM, service factor 1.0
* Necessary power times 100 rpm, divided by motor rpm equals (HP per 100)
* 25 hp times 100 = 2,500 divided by 1750 = 1,43 HP / 100 RPM
* Referring to table below and using 1.43 HP /100 RPM , you can select required coupling at various service factor.
Coupling Number
Max RPM
HP per 100 RPM

Torque @ 1.0 S.F.

(LB in)
Service Factors
1.0
1.15
2.0
2.5
3.0
4500
1.43
.95
.72
.57
.48
900
4000
2.86
1.91
1.43
1.14
.95
1,800
3600
3.49
2.33
1.75
1.40
1.16
2,200
3100
5.71
3.81
2.86
2.28
1.90
3,600
2800
6.90
4.60
3.45
2.76
2.30
4,350
2600
8.33
5.55
4.17
3.33
2.78
5,250
2300
12.30
8.20
6.15
4.92
4.10
7,750
2100
19.90
13.27
9.95
7.96
6.63
12,540
1840
43.78
29.19
21.89
17.51
14.59
27,590
1560
59.98
39.99
29.99
23.99
19.99
37,800
1300
130.90
87.27
65.45
52.36
43.63
82,500