Spindle Applications Company

NTN Technical Notes

NTN precision bearing notes on model codes, set markings, precision and preload

Matched precision angular contact bearings resting on a clean spindle assembly bench

Written for maintenance engineers, spindle repair specialists and technical buyers. Spindle Applications Company explains what each part of a full NTN model means and how to keep set details intact from repair to purchase.

Latest Notes

How to read and source NTN spindle bearings

A bearing's bore and outside diameter do not identify a precision execution. These notes cover the details that do: precision class, pairing, preload and bearing position.

Disassembled machine tool spindle with its bearings laid out on a repair bench

Can't confirm an NTN model from the marking?

Send us the code as you read it, with the machine model and bearing position. Hard-to-read markings also suggest topics for future notes.