I put these in my Zero Tolerance 0562, 0462 and 0452 and was pleasantly surprised. I was honestly very skeptical and didn't think there would be a real noticable improvement over the factory steel bearings. but they are so cheap, I figured I would give them a try anyways.
They actually smoothed out the pivot to perfection!
To do a real comparison test, I disassembled, cleaned, reassembled and then torqued the pivot to 6nm with the factory bearings and then I wedged the lock bar down to allow free blade movement.
While slowly moving the blade I could feel slight catches or bumps consistently throughout the movement. I then repeated the same process but installed the ceramic bearings instead.
At first it felt the same as the factory bearings. but I noticed the more I worked them the smoother it got. And after about 20 minutes I feel absolutely nothing, Smooth as glass!
This leads me to believe the factory bearings aren't perfectly consistent in size or possibly slightly out of round. And the ceramic bearings actually leveled out the race that was created in the titanium by the factory steel bearings.
These are clearly much more uniform in size and shape and a great upgrade.
Definitely worth the investment!
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Artu 1/4 in. x 4 1/4 in. Multi-Purpose Drill Bit Cobalt 01030 USA Made
Jun 25, 2018
Better than i ever expected.
This bit is fantastic.
so far running on high at 4000RPM I have put 9 holes total between three 60/61 Rc 1095 knife blades and one hole in a 64 Rc M4 blade. so far it hasn't diminished in performance much.
I am honestly quite shocked by its ability to drill this stuff.