Letool 4pcs U Type Groove Pulley Nylon Guide Pulley Rolling Bearing U Groove Roller Wheel 8x40x20mm for Driving Mechanical Equipment, or Used in Doors and Windows

These use standard 608 skate bearing and are rated for a lot of load. The bearing is not as frictionless as a fidget spinner, but it turns as easily as a skateboard or roller blade wheel does. I used these as support and guide rollers for a travelling rope system, like a scaled-down chairlift. I also looked at some larger diameter white pulleys, but those had a deeper grove with vertical sides, which prevents the rope hanger arm from passing through both vertical support pulleys and the horizontal main drive and idler wheels while keeping the same angle where the arm clamps on the rope.

These nylon wheels are turning very smooth. Because they are wide and use single bearing, you will need 8mm spacers to distance them from the surface of attached material. Perfect for my project.

these exactly fit high pressure (heavy duty hydraulic) 1/2 inch pipe, which has thicker walls than ordinary water pipe, and slightly smaller diameter. A heavier bearing would be nice maybe.

Working well on a sliding closet door.

Works great smooth running

The Letool 4pcs 608zz coated pa66 wheels are a great product I used the wheels to create sliding doors in my garage. They are working to my expectations so I’m very satisfied.

Ok

I was looking for rollers to guide a power cord on a lamp fixture that was to be raised and lowered. These units had a nice deep groove and were easy to design into a bracket. The bearings operate smoothly and the overall construction seems of good quality.