About our Variable Speed Pulleys

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

Standard bores range from 3/8" to 5/8" in hex shaft design. These pulleys combine strength and cost savings of a steel hub and mounting shaft; the pulley flanges are a combination of glass-reinforced nylon and steel pulley face.

Designed for belt sizes from 3/8" V to 1/2" V and horsepower ratings up to 1/2 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 2.45:1 up to 2.8:1.

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

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
3/8 1/2 5/8 10mm 12mm 16mm
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.

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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