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Zhongda engineers reviewing bearing drawings in a technical meeting
Technical Support

Not just answers,
a partner to rely on

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Five sections

Answers that work
on the shop floor

Technical support is not a slogan here. Five pages answer the five questions that come up most often: how to read a code, how to cross a competitor’s model, whether a non-standard duty can be met, how to mount it without damage, and where the source data lives. Each page is a table or a tool you can use straight away, not an introduction.

New to mounted bearings? Start with the code explanation — once a model number reads clearly, every decision after it gets easier.
Frequently asked

The questions we
answer every week

These six come up most often in sales and engineering conversations. Every answer carries a direct link to the page that holds the data, so there is nothing to hunt for.

Engineer inspecting a finished bearing in the laboratory
Zhongda laboratory · finished bearing inspection

The base code (for instance UC) defines the basic structure — spherical or plain outer ring, and how the inner ring locks. Each segment after a / describes the lubrication hole, surface treatment, seal type or set-screw finish. The full rules are on the Z&R Code Explanation page.

For the common sizes we have a cross reference — Model Conversion currently lists 28 entries. Note that with identical envelope dimensions the internal design, seal type and tolerance class can still differ between brands: a cross reference answers “will it fit”, not “will it last”. For demanding duties, confirm with our engineers before ordering.

Yes. Send the duty — shaft diameter, speed, load, working temperature, medium — and we return a feasibility judgement and a recommended design, normally within one working day. Details on Product Development And Customization.

Three things: the mounting surface must be flat to 0.15 mm or better; never strike the bearing directly with a metal hammer; and locking bolts must be used with washers and tightened to the recommended torque. Step-by-step instructions are on Installation Guidance.

Full catalogues are downloadable from Directory Download. If you need 2D/3D drawings or a selection calculation for a specific model, just email us.

No. Everything on this site is open and downloads directly.

Contact engineers

Unsure about a model, or need a
non-standard duty confirmed?

Describe the application — speed, load, shaft diameter, working temperature, whether water or dust gets in — and our engineers will come back within one working day with a selection recommendation and a cross reference.