Follow each ring, ball and cage through grinding, assembly and noise test to the packed box.

Bearing plants machine inner and outer rings from steel tube or bar, harden them, and grind the bores and raceways to micron tolerances. Balls or rollers and cages are fitted, seals are pressed in, and grease is metered into each bearing before it is tested. Each bearing leaves with a designation, a clearance class and a packed sleeve.

Bearing manufacturing software tracks the rings, balls and cages as separate lots that meet at assembly. Matching, noise tests and clearance readings stay on the lot and are never retyped. Share your requirements, from steel tube through the grinders, the assembly bench and the test rig to the packed carton.

Orders arrive by designation, such as a deep groove ball bearing or a tapered roller bearing, with a clearance class and a seal or shield type. The plant plans from that code. Steel arrives with a mill certificate. Tube and bar are cut and turned into ring blanks, then go through hardening and tempering. Each furnace load is one lot. Trays come out numbered. Grinders then finish the outer diameter, bore, faces and raceways, and honing or superfinishing follows. Gauge readings for ring size and raceway profile are taken at set intervals.

At assembly, an inner ring, an outer ring, a set of balls and a cage are matched to reach the clearance the order asks for. Seals are pressed in and grease is metered. Each bearing then passes a noise and rotation test. Bearings are marked, coated with preservative, wrapped in paper and packed into branded boxes that the customer’s stores will scan, check against the order and shelve by designation. Rejected parts are set aside and logged.