Support-seat journals
Machine bearing seats, shoulders, and lock-nut threads according to BK/BF, FK/FF, EK/EF, or buyer drawings.
Shaft-end machining
Ball Screw End Machining for BK/BF, FK/FF, EK/EF Supports
End machining turns a standard shaft or bar into an installation-ready component. The machined ends must fit the bearing supports, coupling, locknut, and available mounting space. Send the support model or end drawing before requesting a quote.
Coupling ends
Control shaft diameter, length, keyway, flat, or threaded end so the screw connects correctly with the motor side.
Custom ends
Support special repair and OEM requirements when the customer provides dimensions, tolerances, and assembly notes.
Term note
BK/BF, FK/FF, and EK/EF are support unit combinations, not ball screw models.
BK, FK, and EK are usually fixed-side supports. BF, FF, and EF are usually support-side units. End machining must match bearing seats, shoulders, threads, retaining grooves, and coupling-side dimensions. Dimensions may vary by support brand, so send the support model, end drawing, or installation dimensions.
Factory evidence
Machining and inspection evidence
End machining is not quoted from the model alone. We first confirm the support model, end drawing, total length, thread length, and installation dimensions, then machine bearing journals, shoulders, locknut threads, and coupling ends according to the drawing or sample dimensions.
Before machining
Confirm BK/BF, FK/FF, or EK/EF support models, end drawings, old-part photos, total length, thread length, and installation dimensions.
Machining control
Machine bearing journals, shoulders, locknut threads, coupling ends, and required grooves from drawings or sample dimensions instead of guessing from generic sizes.
After machining inspection
Check total length, end dimensions, runout or coaxiality risk, nut movement, and packing condition before shipment.
Why it matters
Small end errors can create large installation problems.
End machining should be defined in the quote from the start. An incorrect journal length, thread size, or shoulder position can prevent assembly even when the threaded section is correct.
- Confirm fixed-side and support-side bearing models.
- Check coupling diameter and motor-side connection.
- Define thread, keyway, groove, shoulder, and chamfer details.
- Mark drawing revision so quotation and production use the same file.
- Request inspection photos for critical end dimensions before shipment.
End machining resources
Confirm end machining with drawings, support units, and dimension checks.
Confirm the support unit, drawing, and end dimensions before sending a machining RFQ.
End Machining
BK/BF Ball Screw End Machining: Support Unit Drawing Guide
Confirm the BK/BF support model before machining the shaft ends, then verify the drawing, bearing seats, threads, coupling end, and assembly length.
Send end machining drawing
End Machining
BK/BF Ball Screw Support Unit Selection Guide
Before end machining, confirm the support-unit model, screw diameter, bearing journal, coupling end, and installation space.
Send support unit model
End Machining
Ball Screw End Machining Drawing Checklist
Before sending an end-machining drawing, check the fixed side, support side, datum, and tolerances.
Send end machining drawing
End Machining
How to Measure Ball Screw End Machining Dimensions
Break end machining dimensions into measurable items so buyers can prepare an RFQ without a complete drawing.
Send end dimensionsFAQ
End Machining FAQ
End machining depends on support units, bearing journals, lock threads, and coupling-end dimensions, not just a BK/BF name.
What dimensions are required for an end machining RFQ?
Please provide the support unit model, end drawing, or installation dimensions, including bearing journal diameter and length, shoulders, lock thread, coupling end, keyway, and total length.
Is a BK/BF support unit model enough?
Usually not. BK/BF is a common support combination, but dimensions can vary by brand. It is better to send the support brand, drawing, or old-part end photos together.
Can inspection evidence be provided after end machining?
Yes. Depending on the order, we can discuss key dimensions, end appearance, nut movement, runout checks, and machining photos to reduce installation risk.