Stainless Steel 5mm Deep U Groove Ball Bearings Pack of 2, Pulley Bearing Wheel Rail Ball Bearings Wheel

Great product, rolls well, no wobble, precision made, would buy again for this and other projects. Highly recommend. Also really nice a 1/4 inch stainless steel bolt fit just right.

high quality product

I used these pulleys for the 1/4 rope on my automatic swimming pool cover. I was not sure it was going to work when I received them because the U groove is shallow (Not deep as advertised) however, it seems to function well. I am satisfied with the product.

Used these on the mast of a sailboat. Perfect fit. It helped that the dimensions were clearly shown in a photo. Bearings rotate smoothly.

Excellent product ! They are very smooth with very little slack in any direction

These salvaged our zip line, which has been neglected by the kids because it no longer zipped. The new bearings where a perfect fit, and the zip line works perfectly now.

Solid bearings. Being used on a neighborhood zip line outdoors. After 2 months they’re holding up great.

Bought these to replace one I had that wore down. These worked great so far. The kids have only used the zip line a few times since Ive replaced it with these so time will tell us on the longevity.

they work very good I am very well pleased with them.

The bearing I just received (S608z) seems to be of nice quality (maybe a 4 or a 5). Seems tight and good finish. But the dimensions listed arent close to actual. The bearings I just received had an outside diameter of 31.5mm, and a width on outside of shoulders of 12mm (10.43mm for width of rotating pulley). The shaft appears to be closer to .25 (6.4mm). And depth of groove is 2.8mm. Maybe size doesnt matter (no joke intended), but not sure why you would put dimensions in a listing if they arent right.