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End Machining

BK/BF Support Unit Selection Guide

Help buyers confirm support unit models before end machining so the screw, bearing block, and coupling fit together.

Published: · End Machining

BK/BFsupport unitfixed sideend machining
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Quick answer

BK/BF support unit selection starts by separating fixed side and support side, and BK12 or BF12 should not be treated as the screw diameter. The RFQ should state support model, screw diameter, end journal, bearing length, lock thread, coupling end, and installation space, preferably with the real support unit or brand drawing.

Separate fixed side and support side first

BK, FK, and EK are usually fixed-side supports with bearing and locking structures for axial positioning. BF, FF, and EF are usually support-side units. The pair affects end machining dimensions.

Support model is not the same as screw model

Models such as BK12, BK15, and BK20 often relate to bearing bore and mounting dimensions, not directly to screw diameter. Confirm screw diameter, end journal, bearing length, and lock thread together.

Different brands may have different details

Even when the name is the same, dimensions can vary by brand. For end machining, use the real support unit, brand drawing, or customer-confirmed drawing as the reference.

  • Fixed-side model such as BK12, FK15, or EK10.
  • Support-side model such as BF12, FF15, or EF10.
  • Coupling end diameter, length, and keyway requirement.
  • Installation space, overall length, and working travel.

FAQ

**Does BK12 mean the screw diameter is 12 mm?**

Not necessarily. BK12 usually relates to bearing bore and support unit mounting dimensions, not the full screw model. Confirm screw diameter, end machining, and coupling-end dimensions together.

Next step

Turn this guide into an RFQ

When the specification direction is clear, send the details below together with quantity, lead time, and packing requirements.

Include these details

  • Support-unit model, end drawing, or old-part end photos.
  • Bearing journal, shoulder, lock thread, keyway, and coupling-end dimensions.
  • Overall length, thread length, quantity, inspection, and packing requirements.
Send support unit modelView end machining service

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