Support-seat journals
Machine bearing seats, shoulders, and lock-nut threads according to BK/BF, FK/FF, EK/EF, or buyer drawings.
Machining upgrade service
Ball Screw End Machining for BK/BF, FK/FF, EK/EF Supports
End machining upgrades a standard part or bar into an installation-ready component. It determines whether the screw fits the bearing support, coupling, lock nut, and machine mounting space. Send the support model or end drawing before quotation.
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 part of the quotation, not an afterthought. Wrong journal length, thread size, or shoulder position can stop assembly even when the threaded screw 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.