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Variable Speed Pulleys

Variable Speed Pulleys (VPS), Economical Fractional Horsepower (FHP) Pulleys combine all the cost-saving features of glass reinforced nylon with steel shafts and steel-clad flanges for greater wear resistance. Speed range is infinitely variable within standard ratio limits. All pulleys are spring-loaded and color-coded to indicate spring pressure.

We also offer Precision Variable Speed Pulleys featuring close tolerances on round shaft, molded keyway, and precisely ground and polished shafts.

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

All Variable Speed Pulleys are supplied with setscrews.

Contact us with your specific requirements for an individual evaluation
Engineering Specifications - Variable Speed Pulleys
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
VPS-10 1/4" V Up to 2.25:1 1/12 23/32" Min
1-3/4" Max
•
•
•
Under 3 oz.
VPS-15 3/8" V Up to 2.45:1
1/4 1-3/8" Min
2-3/4" Max
•
•
5 oz.
VPS-20 1/2" V Up to 2.8:1 1/2 1-7/16" Min
3-1/2" Max
•
•
8 oz.
VPS-43 1/2" V Up to 2.8:1 3/4 1-21/32" Min
4.0" Max
•
•
1 lb. 11 oz.
VPS-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 - Variable Speed Pulleys
Model A B C1
Open		 C2
Closed		 D
Dia.		 Standard Bores
1/4 5/16 3/8 1/2 5/8 3/4
VPS-10 2-1/8 1/2 1/2 1/4 1-7/8
•
 • •      
VPS-15 2-5/8 9/16
 3/4 7/16 2-7/8     • •    
VPS-20 3 5/8 7/8 1/2 3-1/2       • •  
VPS-43 4-1/4 25/32 1 1/2 4-1/4         • •
VPS-50 4-1/4 25/32 1-1/4 5/8 5         • •
Spring Pressures - Variable Speed Pulleys
Model Spring Strength Color Code LBS. COMPRESSION IN SPRING
As Pulley Starts
to Open
Pulley
Fully Open
VPS-10 Medium
Heavy		 White
Blue		 6
8		 9
11
VPS-15 Medium
Heavy		 White
Blue		 14
17-1/2		 18-1/2
22
VPS-20 Medium
Heavy		 White
Blue		 18
22		 23
27-1/2
VPS-43 Medium
 White 33
50		 40
64
VPS-50 Heavy
 Blue 50
66 		64
82

VPS Pulleys are shipped with the blue, heavy strength spring unless another strength spring is requested.
On the Model VPS-10 Pulley, we recommend that only the heaviest blue spring be used if the pulley is to be run with a 3/8-inch width V-belt.
All springs are carried in stock.

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