About our Precision Variable Speed Pulleys

Precision Variable Speed Pulley (VPSR) Engineering Specifications

** Click on Desired Variable Speed Pulley for Detailed Technical Information*

Model Belt Speed
Ratio
HP Rating
@ 1800 RPM
Approx.
Pitch Dia.
Weight
VPSR-43 1/2" V Up to 2.8:1 3/4 1-21/32" Min
4.0" Max
1 lb. 11 oz.

 

Precision Variable Speed Pulley dimensions

Precision Variable Speed (VPSR) Pulleys Pulley Dimensions

** Click on Desired Variable Speed Pulley for Detailed Technical Information*

Model A B C1
Open
C2
Closed
D
Dia.
Standard Bores
5/8 3/4 14mm 19mm
VPSR-43 4-1/4 25/32 1 1/2 4-1/4
Non-Standard Bore sizes, both Inch and Metric are available upon request at no extra charge.  Please contact us



Precision Variable Speed Pulleys (VPSR) Spring Pressures

** Click on Desired Variable Speed Pulley for Detailed Technical Information*

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

VPSR-43

Medium White 33 40

 

Speed range is variable within standard ratio limits.  Standard ratio is 2.8:1.  All of our variable speed pulleys are spring-loaded and color-coded to indicate spring pressure - easy to identify and use.

Standard bore sizes are 5/8 to 3/4 and 14mm to 19mm for the VPSR pulleys. 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 1/2" V and horsepower ratings up to 3/4 HP.  They are engineered to offer an economical alternative for many applications that may not require the expense of AC/DC variable speed motors.

Torque Transmission Precision Variable Speed Pulleys

  • Economical
  • Lightweight
  • Strong
  • Quiet
  • Infinite speed range - within pulley ratio limits
  • Close tolerance on round shaft

Contact us with your specific Variable Speed Pulley requirements >>

Standard size, detailed dimensions and spring pressures are listed below.

Download the Nylon vs. Metal Pulley Whitepaper

Download the Pulley Purchasing Checklist

Standard Tolerances for Bore Sizes, Keyways and Setscrews

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