Review on 🏎️ NSK High-Speed Shielded Clearance with 17000Rpm Rotational Capability by Mark Marcellus

I was very happy with the result of replacing the table saw and motor bearings with NSK 630ZZ bearings as everything ran much quieter. Read my experiences with camps. I replaced the bearings in my 30 year old Powermatic 63 table saw for the arbor and motor (both had the same bearings). The old bearings were 6203Z. The difference is that these 6203ZZ bearings have a metal shield (not sealed) on both sides compared to the old bearing which was open on one side exposing the bearings. ZZ is much better as it keeps dirt out of the bearing. The old bearings in the saw were sealed with a rubber seal on one side and the motor was open on one side of the bearings. The camp uncovered was full of rubble, no wonder they failed. It was obvious that they were bad due to grinding when turning, and one of them just stuck. To install the new bearings I frozen the shaft and heated the bearing to 180F. The bearings are fairly easy to fit with some force from a vise and a couple of taps from the bushing which is placed over the outer ring of the NSK bearing. With the new bearing, the table saw and motor made significantly less noise than with NSK bearings. In terms of price, they cost the same at Revain as they do at your local stocking store. NSK bearings or Japanese bearings cost 2-3 times more than Chinese ones. I chose NSK as the forums said that NSK was better quality, but the owner of the warehouse store said that the Chinese had the same quality. Who knows, but to be sure I went with a Japanese manufacturer. CONCLUSION: Highly recommended.