Precision Variable Speed Pulleys

Variable Speed Pulleys (VPS), Fractional Horsepower Pulleys (FHP) provide all the proven benefits of the well established VPS Series and include the following features to provide quiet running operation:

  • Closer tolerance on round shaft
  • Molded keyway
  • Precisely ground and polished shafts

Speed range is infinitely variable within standard ratio limits. All pulleys are spring-loaded and color-coded to indicate spring pressure.

Standard sizes and types, detailed dimensions and spring pressures are listed below.

Contact us with your specific requirements for an individual evaluation
Engineering Specifications - Precision Variable Speed Pulleys (VPS)
Model Belt Speed
Ratio 		HP Rating
@ 1800 RPM 		Approx.
Pitch Dia. 		Standard Bores Weight
1/4
5/16
3/8
1/2
5/8
3/4
VPSR-10 1/4" V Up to 2.25:1 1/12 23/32" Min
1-3/4" Max
•
•
•
Under 3 oz.
VPSR-15 3/8" V Up to 2.45:1
1/4 1-3/8" Min
2-3/4" Max
•
•
5 oz.
VPSR-20 1/2" V Up to 2.8:1 1/2 1-7/16" Min
3-1/2" Max
•
•
8 oz.
VPSR-43 1/2" V Up to 2.8:1 3/4 1-21/32" Min
4.0" Max
•
•
1 lb. 11 oz.
VPSR-50 5/8" V Up to 2.8:1 1.0 1-5/8" Min
4-3/4" Max
•
•
1 lb. 14 oz.

Standard Tolerances for Bore Sizes, Keyways and Setscrews

Pulley Dimensions - Precision Variable Speed Pulleys (VPS)
Model A B C1
Open		 C2
Closed		 D
Dia.		 Standard Bores
1/4
5/16
3/8
1/2
5/8
3/4
VPSR-10 2-1/8 1/2 1/2 1/4 1-7/8
•
•
•
VPSR-15 2-5/8 9/16
 3/4 7/16 2-7/8
•
•
VPSR-20 3 5/8 7/8 1/2 3-1/2
•
•
VPSR-43 4-1/4 25/32 1 1/2 4-1/4
•
•
VPSR-50 4-1/4 25/32 1-1/4 5/8 5
•
•

WARNING: All open belt drives must be adequately guarded for personal safety during operation.
Spring Pressures - Precision Variable Speed Pulleys (VPS)
Model Spring Strength Color Code LBS. COMPRESSION IN SPRING
As Pulley Starts
to Open
Pulley
Fully Open
VPSR-10 Medium
Heavy		 White
Blue		 6
8		 9
11
VPSR-15 Medium
Heavy		 White
Blue		 14
17-1/2		 18-1/2
22
VPSR-20 Medium
Heavy		 White
Blue		 18
22		 23
27-1/2
VPSR-43 Medium
 White 33
50		 40
64
VPSR-50 Heavy
 Blue 50
66 		64
82

VPS Pulleys are shipped with the blue, heavy strength spring unless another strength spring is requested.

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