Short answer: Supplier process change notification helps buyers avoid surprise changes in stamped parts after approval. The RFQ or quality agreement should define which changes require notice, what evidence is needed, who approves the change, how old and new lots are separated, and whether samples, first-off records, dimensional reports, or functional tests are required before shipment.
Stamped parts often depend on details that are not obvious in the unit price: material source, coil temper, die maintenance, plating route, cleaning chemistry, deburring method, packaging, inspection fixture, and the order of operations. A small supplier-side change can create a real assembly problem if the buyer is not told.
Use this page with the stamped parts quality agreement checklist, supplier transfer checklist, control plan checklist, and tooling maintenance audit checklist.
Process changes buyers should define
| Change type | Possible risk | Evidence to request |
|---|---|---|
| Material source or temper | Forming, spring force, flatness, weldability, or corrosion may change. | Material certificate, trial parts, dimensions, and functional checks. |
| Tool repair or replacement | Hole location, burr side, bend angle, and surface marks may shift. | First-off samples, last-off comparison, maintenance record, and CTQ report. |
| Finish or cleaning route | Plating thickness, solderability, stains, oil residue, or appearance may change. | Process record, inspection results, photos, and approved samples. |
| Packaging or label method | Parts can bend, mix, corrode, or arrive with unreadable traceability. | Pack photos, label sample, transit check, and lot separation rule. |
Define notification triggers before there is a problem
A process change rule should be written before production starts. If the buyer waits until a complaint, both sides may disagree about whether the supplier was allowed to change a coil supplier, sharpen the die, move the tool, change plating supplier, alter cleaning, revise inspection frequency, or switch packaging.
The rule does not need to block every small shop action. It should focus on changes that can affect fit, function, appearance, corrosion, traceability, delivery risk, or customer approval. Tie the rule to the first article inspection checklist and the first-off and last-off guide so evidence is scaled to the risk.
Separate notification from approval
Some changes only need notice. Others need buyer approval before shipment. A replacement wear insert may need a first-off report. A new plating supplier may need samples, thickness data, solderability, salt spray, or contact resistance evidence. A material substitution may need drawing approval before the supplier buys coil.
Keep old and new production separated until the buyer decision is clear. Lot labels, revision notes, shipment dates, and retained samples should show what changed and when. If incoming inspection may receive both conditions, connect the plan to the incoming inspection checklist and lot traceability guide. For customer-owned tools, also state who can approve a temporary repair or alternate route.
RFQ details to include
- Drawing revision, material, finish, CTQ features, customer approval requirements, and any no-change conditions.
- Change triggers: material source, grade, temper, die repair, die transfer, plating supplier, cleaning method, deburring, inspection fixture, packaging, label, or sub-supplier.
- Notice timing, buyer approval route, sample quantity, required report, and whether shipment is blocked until approval.
- Evidence needed by change type: dimensional report, first-off sample, capability data, plating report, functional test, photos, pack trial, or retained sample.
- Old/new lot separation, effective date, inventory disposition, label wording, and communication contact on both sides.
- Prototype, pilot, and production volume, plus any end-customer notification rule that the supplier must support.
How to compare supplier answers
A useful supplier answer names the changes that require notice and the evidence used for approval. A weak answer says changes will be controlled but does not define the trigger list or report package.
Ask how the supplier handles urgent changes, such as a broken die component or unavailable material. The answer should include containment, sample approval, old/new lot separation, and communication timing rather than only promising no delay.
Send drawings, quality agreement needs, customer change rules, and approval expectations through the contact page. Use the RFQ form to define process change notification before production sourcing is awarded.
FAQ
What is process change notification for stamped parts?
It is a rule that tells the supplier when material, tooling, finish, inspection, packaging, or sub-supplier changes must be reported before shipment.
Do all supplier changes need buyer approval?
No. Some need only notice, while higher-risk changes need samples, reports, and buyer approval before shipment.
Which stamping changes are usually high risk?
Material source, temper, tool repair, tool transfer, plating supplier, cleaning chemistry, inspection fixture, packaging method, and revision cut-in can be high risk.
What should a buyer include in the RFQ?
Include change triggers, approval timing, evidence required by change type, old/new lot separation, label rules, inventory disposition, and contact responsibility.