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The tooling quotation tells you what a die maker wants you to know; the factory floor tells you what it can actually deliver. A single visit can reveal whether the engineering team exists, the machines are real, the heat treatment is controlled, and the maintenance records tell the truth. This guide breaks the die-maker audit into eight concrete details, explains what to look for at each stop, and gives you the red flags that should end the conversation before the purchase order starts.

The die type decides the tooling budget, the unit price, the lead time, and the quality of every part in the programme. Choosing wrong means paying progressive-level tooling for a low-volume part or watching a transfer-sized geometry get squeezed into a strip that cannot carry it. This guide compares line, progressive, and transfer dies across volume, part size, complexity, tolerance, material use, and cost and gives a practical framework for making the call with your tooling team.

Quality in stamping is a system, not a single inspection. It starts with the drawing and the incoming coil, runs through tool checks and in-process sampling, and ends with measurement, documentation, and shipment approval. FAI, CMM, SPC, MSA, and PPAP are the tools inside that system, and each one answers a different question about the parts you are buying. This guide explains what each tool does, when it matters, and what to ask a supplier before you trust their quality programme.

The same stamped part can be made by a die that lasts 100,000 hits or one that lasts several million. The difference is not luck; it is a chain of decisions about tool steel, heat treatment, clearance, lubrication, press accuracy, and maintenance. Each decision is small, and together they decide the cost per part of every programme. This guide explains the wear mechanisms behind die failure, what extends tool life at each stage, and how to read a supplier's die-life story before you commit to tooling.

A stamping quote looks like three numbers: tooling, material, and unit price. What it really is, is a cost model built on assumptions about your design, volume, tolerances, finishes, and inspection. Read it wrong and a cheap quote becomes an expensive order; read it right and you can compare suppliers on equal ground. This guide breaks down each line item, explains how tooling amortises across volume, and shows what belongs in your RFQ so quotes arrive complete the first time.

Tolerance is where stamping projects either stay on budget or quietly bleed it. A drawing that asks for more precision than the process can deliver buys slower presses, tighter tooling, extra inspection, and scrap. The fix is knowing what each tolerance grade really costs and what the process can hold. This guide covers ISO 2768 grades, realistic limits for holes, positions, bends, and flatness, and how to call out tolerances that match your function without paying for precision you do not need.