I wasn't able to find the exact dimensions for the RBC Bearings SJ9718 needle roller bearing in the information provided. If you need those specifics, it might be best to check out the manufacturer's technical sheets or documentation directly.

If you're curious about its use, though—according to the manufacturer's description, this bearing is meant for heavy-duty tasks and should be lubricated with grease for smooth operation and less wear.

For anything technical like precise measurements, getting in touch with the manufacturer or supplier should provide the details you're after.