How to Reconfirm Ball Screw Drawing Changes After Quotation

Drawing change after quotation should not be handled verbally

If a ball screw drawing change happens after quotation, state the revision number, change date, and changed area. Saying small modification in email can make quotation, production, and inspection use different files.

End dimension changes have the largest impact

Changes to end dimension, bearing journal, lock thread, shoulder, keyway, coupling end, or nut style can affect machining time, tooling, inspection, and assembly risk. Reconfirm the end machining route after the change.

Tolerance and accuracy also change cost

If tolerance, runout, accuracy grade, preload, or backlash requirements become tighter, cost change and lead time change need review. The RFQ should state which dimensions are reference only and which must follow tolerance.

Freeze revision before requote

Before requote, the buyer should confirm final drawing revision, replace old files, mark changed points, and state whether the old quotation is invalid. Then the supplier can judge cost change, lead time change, and sample need.

Drawing change reconfirmation checklist

Drawing change note, after quotation change reason, revision number, and change date.
End dimension, nut style, support unit, coupling end, and machining scope.
Tolerance, accuracy, preload or backlash, inspection request, and cost change.
Requote, whether old quotation is invalid, lead time change, and final confirmer.

Typical buyer situations

This topic usually appears in distributor stocking, repair replacement, machine retrofit, automation projects, and drawing-based purchasing. If a buyer sends only one model number, the supplier cannot judge the real use, packing risk, or whether machining upgrades are needed.

Details to confirm before quotation

To reduce repeated questions, the RFQ should cover product specification, use case, and delivery expectations together. The following points can be copied into the RFQ form or email.

Purchase purpose: distributor stock, repair replacement, machine project, or sample testing.
Specification: diameter, lead, overall length, thread length, nut type, and quantity.
Machining: cut-to-length, end machining, and whether BK/BF, FK/FF, EK/EF, or other supports must be matched.
Delivery: target quantity, expected lead time, packing, labels, shipping method, and whether shipment photos are required.

Common mistakes

A common mistake is asking only for unit price without application, quantity, or packing details. Another is sending photos without dimensions. This turns quotation into guesswork and can create errors in end machining, nut matching, or long-part shipping.

Next step

If the specification is clear, submit an RFQ directly. If the model or accuracy grade is still uncertain, describe the machine use and old part details so the supplier can recommend a standard part, bar stock, cut-to-length, or end machining route.

Submit related RFQ Open RFQ form