About our Variable Speed Pulleys

Speed range is infinitely variable within standard ratio limits. All of our variable speed pulleys are spring-loaded and color-coded to indicate spring pressure - easy to identify and use.

Standard bores range from 1/4" to 3/4" in both hex and round shaft designs. These pulleys combine the cost savings and strength of glass reinforced nylon and steel hubs with the wear resistance of steel-clad flanges.

Designed for belt sizes from 1/4" V to 5/8" V and horsepower ratings from 1/12 HP to 1.0 HP, they are engineered to offer an economical alternative for many applications that may not require the expense of AC/DC variable speed motors and drives.

Simple belt tensioning adjustments allows for speed changes from 2.25:1 up to 2.8:1.

  • Economical
  • Lightweight
  • Strong
  • Quiet
  • Infinite speed range - within pulley's ratio limits

Torque Transmission also offerPrecision Variable Speed Pulleys featuring close tolerances on round shaft, molded keyway, and precisely ground and polished shafts and a variety of spring pressures ranging from 6 pounds to 82 pounds, depending upon the model.

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

 

Variable Speed Pulley (VPS) Engineering Specifications

Model Belt Speed
Ratio
HP Rating
@ 1800 RPM
Approx.
Pitch Dia.

Weight
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.

 

Precision Variable Speed Pulley dimensions

Variable Speed Pulley (VPS) Dimensions

Model A B C1
Open
C2
Closed
D
Dia.
Standard Bores
1/4 5/16 3/8 1/2 5/8 3/4
VPS-15 2-5/8 9/16 3/4 7/16 2-7/8        
VPS-20 3   7/8 1/2 3-1/2        
Non-Standard Bore sizes, both Inch and Metric are available upon request at no extra charge.  Please contact us.


Variable Speed Pulley (VPS) Spring Pressures

Model Spring Strength Color Code LBS. COMPRESSION IN SPRING
As Pulley Starts
to Open
Pulley
Fully Open
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

Variable Speed 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.

Torque Transmission is an ISO Certified company.

Download the Pulley Purchasing Checklist

Variable Speed Pulleys

Standard Tolerances for Bore Sizes, Keyways and Setscrews

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