4 Pcs 4mm to 4mm Universal Joint Shaft Coupling for Motor | with Screws

Well made and seem to be solid enough for the task. These have c clips holding the cross pins. Others don't. They are quite weak. Working well so far.

Worked perfectly for my project

They seem sturdy enough. They're not solid stainless steel but they're not a cheap metal. The things I like most about these is they're precise at 8mm with no wiggle or friction. The boar is 8mm straight to the joint, so if you needed to restrict motion you can push your rod or shaft up flush to the joint bar. Also another nice thing is the joint on these aren't some metal dowel smashed in but rather a pin with snaprings keeping in place so if you so needed you could take it apart and use as a y joint. I personally used these for a motorized actuator and this is the joint that goes on the back of the push rod and front of the rotating arm and it keeps the rods in place well without any wiggle or getting loose, just be sure to file or drill a couple of dimples for the set screws on your rod and it'll hold it tight and no rotating or jiggle.

Im sure they have a purpose but precision is not one of them. There is quite a bit if rotational slop in them so if you run two on the same shaft you will have basically 1/4 turn of slop. This is from left to right rotation. If its pre loaded then, of course, its a non issue if travelling one direction.

Works as it should, 4 stars because the allen screws to tighten it get rounded off easy

Very good construction

Excellent quality throughout, worked perfectly for intended use. Will definitely buy again.

This product connected an 8mm threaded rod to an 8mm pillow block bearing.

Artikel ok, leider im Modell sehr laut. Trotz ausgerichtete Wellen.

Il me semble très bien

Just what I Needed for robotic project Thanks...