Bearing buyer question
How Do I Qualify a Precision Bearing Supplier for Robotics or Machine Tools?
Qualify against the machine function, not a generic “precision” claim. Fix the accuracy class, runout, preload, stiffness or torque target, mounting interfaces and measurement method on the approved specification.
Information required for a checkable answer
- Axis function and required positioning accuracy
- Radial and axial runout limits
- Accuracy class and referenced standard
- Preload or clearance and torque window
- Radial, axial and moment loads
- Speed, lubrication and thermal behavior
- Shaft, housing, shoulder and clamp tolerances
Certificates and order evidence
Do not accept a logo or an undated certificate screenshot as proof. Check the certificate holder, site address, scope, standard, issuer, certificate number and validity. Then request order-specific records for the bearing you are buying.
Available documents are confirmed against the selected supplier, specific product and order. A document is not promised until its holder, scope and availability have been checked.
Lead time and delivery confirmation
A reliable lead time is issued after the drawing revision, material route, quantity, tooling, inspection scope and packing are fixed. Ask for separate dates for drawing approval, material readiness, first article, batch completion and dispatch.
Recommended RFQ package
Send the controlled drawing or model, application conditions, quantity, destination country and the records you require. We will identify missing inputs and reply with the review status before a production commitment.
Use the bearing RFQ checklistFrequently asked questions
Is an accuracy class enough?
No. The order should identify the applicable standard and the actual characteristics to be measured, such as inner or outer ring runout and dimensional tolerances.
Why request a first article?
A first article checks whether the proposed process and measurement method can produce the approved design before the production batch is released.
What must be controlled during mounting?
Fits, shoulder geometry, housing rigidity, fastener sequence, contamination and preload-setting method can change the installed result.