UC217-55
Holding a bearing marked NSK UC217-307D1 or NTN UC217-307 or AMI UC217-55? Ours is UC217-55 — the same seat size, the same type and the same sealing and clearance design.
What this bearing is
UC217-55 is a Radial insert ball bearing with a 87.313 × 150 × 85.7 mm seat, execution: open. The manufacturer's cross-reference catalogue confirms full interchangeability for 4 designations, including NSK UC217-307D1, NTN UC217-307, NTN UC217-307D1. For 1 designation (PEER UC217-55) interchangeability is conditional — the difference usually lies in radial clearance or cage design, so compare the data sheets before fitting.
Designation equivalents
⌀87.313 × 150 × 85.7 mm
Before you replace it
This is a dimensional and design equivalent: the same seat size, the same bearing type and the same sealing and clearance design. It is not the same product — load ratings, tolerance class and grease may differ between manufacturers. For duty close to the limits or a critical application, check the datasheet of the specific design.
Where these equivalents come from
The base number of a standard bearing is an ISO standard — 6205 is 6205 at every manufacturer. Only the suffixes describing the design differ, and those are what we translate: shields, contact seals, cage and radial clearance. Designations that mean different things at different makers are deliberately omitted.