2PCS Set 2GT Aluminum Timing Pulley 20&36 Teeth 5mm Bore Synchronous Wheel with 2PCS Length 200mm Width 6mm Belt (20-36T-5B-6)

These pulleys fit great on my stepper motors that have 5mm shafts. Each has two set screws for redundant fixity to the stepper shaft which is not something I've seen on other pulleys but feels like a nice touch. The hex key for the set screws is also included incase you don't have one of the correct size which is also nice. The GT2 belt also works and seems well made, no obvious kinks or bends. All in all I'm very pleased with this, it's definitely worth picking up, even if just for the pulleys and not the belts.

I have a few low rpm motors I make jigs with, but they all have 7mm shafts, so I figures I'd chuck these up in the lathe and open em up. I did, and they work like a champ. Much better torque transmission than a 6mm round urethane belt.

I'm building something that requires precision and I had a 5mm steel rod but it didn't fit in the larger pully. When I checked the inner diameter with digital calipers it was only 4.95mm meaning I couldn't fit the steel rod into the pulley and aligned with the fact I couldn't fit the rod into the pulley.

I like useing this product for rc cars they have great purposis