Short answer: A metal stamping supplier onboarding package should prove more than price. Before approval, buyers should collect drawing review feedback, tooling assumptions, material control evidence, inspection capability, sample approval records, compliance documents, capacity notes, packaging rules, and a clear communication path for changes or nonconforming lots.
Supplier onboarding is where many later problems can be prevented. If the first order is placed before evidence is clear, the buyer may later discover weak tooling assumptions, missing material certificates, unclear plating control, limited measurement capability, or no plan for revision control. A simple checklist keeps purchasing, engineering, and quality aligned before tooling or production release.
Use this checklist with the supplier risk matrix, supplier quality audit checklist, China supplier checklist, and PPAP and FAI package guide.
Evidence to request before supplier approval
| Evidence area | What to request | Why it matters |
|---|---|---|
| Drawing review | DFM notes, tolerance concerns, burr direction, bend risk, and open assumptions. | Confirms the supplier has studied the part instead of only quoting the print. |
| Tooling plan | Die type, expected tool life, maintenance plan, spare inserts, and sample approval path. | Reduces launch surprises and later ownership disputes. |
| Material control | Material grade, thickness, temper, certificate, substitution rule, and approved source. | Prevents quiet material changes that affect forming, strength, or finish. |
| Quality evidence | FAI, inspection method, control plan, gauge list, AQL plan, SPC need, and corrective action flow. | Shows how critical features will be measured and controlled. |
| Commercial and logistics | MOQ, lead time, packaging, Incoterms, export documents, and escalation contacts. | Makes the first order easier to release and track. |
Start with the part risk, not a generic form
A simple bracket does not need the same onboarding evidence as a plated terminal, spring contact, EMI shield, battery contact, or automotive component. Weight the checklist by tolerance, material risk, finish, annual volume, approval documents, and how costly a line stop would be.
If the part has tight CTQs, combine onboarding with the inspection equipment guide, Gage R&R and MSA guide, and control plan checklist.
Documents that prevent first-order confusion
- 2D drawing, 3D file, revision, material grade, thickness, finish, and annual volume.
- Supplier DFM comments and stated quote assumptions.
- Tooling ownership, storage, maintenance, and modification rules.
- Inspection plan, sample size, gauge method, and report format.
- Material certificate, plating report, RoHS/REACH or IMDS-style evidence if needed.
- Packaging specification, label format, lot traceability, and shipment photo rule.
- Change control, deviation approval, and nonconformance response process.
Watch for weak onboarding signals
Be careful when a supplier avoids technical questions, gives no DFM notes, cannot explain how CTQs will be measured, treats material substitutions casually, or pushes production before samples are approved. A fast quote can still be useful, but missing evidence should be scored as risk.
For supplier transfer or second-source projects, ask for a plan to compare old samples, new samples, drawing revision, inspection method, and packaging. Use the supplier transfer checklist and tool ownership transfer guide when legacy tooling or old data is involved.
What onboarding can change in the quote
Supplier onboarding may reveal work that should be priced before the first order: a custom gauge, extra sample report, special packaging, outside plating evidence, lower-risk material sourcing, or more formal launch documentation. It is better to price those items early than to discover them after a purchase order is placed. If the requirement is optional, ask the supplier to separate normal production cost from approval document cost.
Supplier onboarding RFQ checklist
Send the drawing package, annual volume, launch date, target quality documents, part risk notes, current supplier problem if any, required compliance records, packaging destination, and approval deadline. Ask the supplier to return quote assumptions, DFM risks, sample plan, document list, and lead time by stage.
If you need a stamping supplier reviewed before first order, send the drawing, material, finish, quantity, required documents, and supplier approval requirement through the contact page. For supplier comparison, use the RFQ form and include your onboarding checklist or customer approval template.
FAQ: metal stamping supplier onboarding
What should a stamping supplier provide before approval?
Request DFM feedback, tooling assumptions, material control evidence, sample approval plan, inspection method, compliance records, capacity notes, and packaging rules.
Is supplier onboarding different from a supplier audit?
Yes. An audit reviews supplier systems. Onboarding confirms the evidence and responsibilities needed for a specific part, tool, first order, and approval path.
When should onboarding happen?
Do it before tooling release or first production order. For urgent second-source work, complete at least the drawing, quality, material, and packaging evidence first.
What is a red flag during onboarding?
A red flag is a supplier that quotes without asking about CTQs, material grade, finish, sample approval, inspection method, packaging, or document requirements.