Pulley Ratio & Speed Ratio | 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