Published 2026-09-01 · Practical guides · Revision Control
A Drawing Changed After the Quote. Now What?
Identify the affected tools, get the supplier's revised commitment and keep unchanged work moving.
A drawing revision does not automatically invalidate every tool in a quote. Find what changed, confirm its effect on the proposed tooling and hold only the items that need review.
Identify the change
Keep both the quoted drawing and the new revision. Have engineering identify the changed features and requirements. Send a marked-up view with a short change note, not just a replacement file named 'latest'.
For example, a deeper blind hole may require a different drill body or usable length even when its diameter stays the same. Review clearance, coolant delivery and any finishing operation. A note change elsewhere may have no tooling effect, but someone responsible for the application must confirm that.
Ask a question the supplier can answer
Name the quote, old and new drawing revisions, affected feature and quoted item. Ask whether the existing tool remains suitable and whether price or delivery changes.
Example request: 'Quote Q-104, item 3 was based on drawing Rev B. Rev C increases the blind-hole depth from 25 mm to 40 mm; diameter and material are unchanged. Please confirm the quoted assembly can meet Rev C, or send a revised offer with any price and delivery change.'
Ask for one clear outcome: unchanged offer confirmed, revised offer supplied, or a specific clarification needed. 'Received' confirms receipt only.
Close the change before purchasing
Record which items remain valid and which need a new selection or approval. Keep the earlier offer with its revision history. Make the accepted drawing and quotation revisions explicit in the purchasing instruction.
If an order has already been placed, involve the purchasing owner and obtain the supplier's acknowledgment of the order change. Replacing an RFQ attachment alone does not change an existing order.