Guide categories
Check support models, end drawings, installation dimensions, and machining risks before quoting.
The screw body is ordered by model. The shaft ends are made to fit the machine. Journals, shoulders, lock threads, and coupling ends touch the support unit, locknut, and coupling directly, so a small difference can block assembly or leave runout once the part is installed. With only a model number and an overall length, the shop has to infer the rest, and a wrong inference sends the whole shaft back for rework.
A drawing states those fits once, in one place. It shows which side is fixed and which side is supported, where the journal length is measured from, how much undercut the thread needs, and whether the coupling end is keyed, flatted, or clamped. Machining and inspection then work from the same reference. For a repair job with no drawing, measuring each step and photographing it is more useful than asking for a copy of the old part.
BK/BF, FK/FF, and EK/EF are support unit combinations, not screw models. BK, FK, and EK normally sit on the fixed side; BF, FF, and EF on the supported side. Journal diameter, shoulder position, and lock thread differ between the two sides, so the order is to choose the support model and coupling first, then derive the end dimensions from them.
Even the same designation can differ between brands. Check the drawing against the support unit you actually bought, or its dimension table. A usable end drawing should show the diameter and length of each step, the lock thread, shoulder and circlip groove positions, the coupling-end form, and the datum that links overall length to the two ends. With those on the sheet, the machined part has a chance to fit on the first assembly.
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
For a BF support-unit RFQ, state the model, shaft journal, lock thread, coupling end, and installation space.
Send support unit RFQ
Before end machining, confirm the support-unit model, screw diameter, bearing journal, coupling end, and installation space.
Send support unit model
Break end machining dimensions into measurable items so buyers can prepare an RFQ without a complete drawing.
Send end dimensions
Before sending an end-machining drawing, check the fixed side, support side, datum, and tolerances.
Send end machining drawingGuide categories
Send the model, length, quantity, application, or old-part photos. We will review the specification against the actual machine and use case.
Before sending an end-machining inquiry, walk the drawing against this list and add whatever is missing.
FAQ
Three questions that come up most often on end-machining inquiries.
Yes, but measure what can be measured: step diameters and lengths, thread size, shoulder positions, and the coupling-end form. Add photos that identify which end is the fixed side. More measured data means less rework.
Send the support model, and if possible its dimension table or a photo of the actual unit. The same designation can differ between brands, so working from the purchased unit is safer than working from a general table.
Yes. End dimensions depend on each other, and changing a length or thread usually moves the adjacent shoulder. Reconfirm the revision and the machining scope so quotation and production use one file.
+8615268772262
Leave your question or requirement and we will continue in WhatsApp.
Continue in WhatsApp