Purchasing & Quality / Purchasing guide
Compare quotations against a common scope before comparing the totals. Material definition, machining, finish, inspection and delivery condition can differ even when suppliers use the same product name. A simple comparison sheet makes those differences visible and prevents an apparently lower price from hiding missing work.
Catalogue reference image. Confirm the quoted configuration against the agreed drawing.
Freeze the enquiry baseline
Send the same drawing revision, quantity and required deliverables to each supplier. Record the date and reference of every quotation. If the design changes during the process, request an updated quotation or clearly identify which parts of the old quotation remain applicable.
List inclusions and exceptions
Compare the proposed material, tooling, machining, finishing, inspection records and packing scope line by line. Ask suppliers to state exclusions and assumptions. Keep a proposed alternative separate from a quotation that complies with the baseline so the choice remains explicit.
Resolve differences before ordering
Use a clarification log to close missing details, then carry the agreed scope into the purchase documentation. Treat delivery dates, quantities and commercial terms as items to confirm with the supplier; do not infer them from a general website statement or a previous order.
Information to include in your enquiry
| Review item | Information to provide |
|---|---|
| Baseline | Same revision, quantity and deliverables |
| Inclusions | Material, operations and inspection |
| Exceptions | Assumptions, exclusions and alternatives |
| Release | Clarifications incorporated into the final order |
Frequently asked questions
Should the lowest unit price decide the order?
Only after the compared scopes and acceptance requirements are understood.
Can a verbal clarification replace an updated scope?
Record the agreed clarification with the order so production and inspection use the same definition.
Discuss your carbon fiber component
Send your drawing revision, intended application, quantity and acceptance requirements to Litian Yunde for a project review.