Customizable Double Row Angular Contact Ball Bearings for High Speed Rotation Equipment

When a CNC spindle starts pulling 20,000 rpm on a production run, the last thing anyone needs is a bearing that can't handle axial load — these are the ones you'd put in that machine. We've seen buyers whose customers are pushing machine tools hard, and the 7200AC series with a 40° contact angle is what they usually grab for the high-thrust stuff, though the 15° works better for pure radial situations.

Every batch gets a 100% dimensional inspection, and we're talking about checking raceway roundness and cage pocket clearance with actual instruments, not just a visual once-over. Teh COA covers vibration levels (Z1 through Z3) and radial clearance from C2 to C5, so you know exactly what you're getting — we retest at no charge if there's any doubt, but that's pretty rare with the CNC grinding process.

28000 rpm on grease is the max we've tested, but that's for the open version with a steel cage; the nylon cage runs quieter but you'll lose a bit of speed, maybe 24000 rpm or so depending on the seal type. is stabilized for high temp, so they don't lose preload when the spindle gets hot — a detail that matters more than most buyers realize until they've had a failure.

Anyway, the standerd is ISO 9001:2015, and we can do DIN, JIS, or ANSI tolerances if you need it, but the P4 and P2 grades are where the tight tolerance actually shows up in the runout numbers. It's basically the same matrial — high carbon chromium steel — but the super finishing on the raceway is what cuts noise, and our company can hit Z2 consistently with a 2RS seal if you're pumping coolant.

Not really suited for heavy radial-only loads at very low speeds — a deep groove ball bearing would be cheaper and more forgiving for that. Most buyers go with the 5L drum packs for machine tool rebuilds, but we've done custom cage materials for pump applicaion where nylon couldn't handle the chemcial exposure.