Cost Lead Time: Qualifying a New Die Casting Supplier

What drives cost in a new die casting relationship

The price of a die casting part is not one number. It is a combination of tooling, material, labor, energy, scrap, and quality systems. When you qualify a new supplier, the first question is not just what the unit price is, but how each cost element is calculated.

Tooling is often the largest non-recurring cost. A new die set for a complex housing can take weeks to design and months to machine. If the supplier includes tooling in the unit price, the quote may look lower at first. If tooling is billed separately, the upfront cash flow demand is higher. Both models exist.

Material cost follows alloy selection. Aluminum alloys are common for general applications. Magnesium is lighter but more expensive and harder to handle. Zinc is used for smaller, high-volume parts with different mechanical expectations. The supplier should specify the alloy grade and the source of the raw material.

Production cost depends on cycle time, shot count, and shift pattern. A part that needs a long cycle will cost more per unit than a simple bracket. Scrap rate matters. If the supplier runs a high scrap rate on your part, the quoted price may not reflect the true cost.

Labor and overhead vary by region and facility capability. A supplier with automated handling and multi-shift operation may charge differently than a smaller shop with manual tending.

What drives lead time in a new relationship

Lead time has three parts: tooling lead time, material lead time, and production lead time.

Tooling lead time is the longest variable. It starts after the RFQ is accepted and the engineering drawings are finalized. It ends when the first shot is approved. A new die set can take longer than a standard part run if the part has complex cores, thin sections, or high precision requirements.

Material lead time is often shorter but can be a hidden delay. If the supplier uses a specific alloy or a certified lot, the raw material may need to be ordered before production starts.

Production lead time is the time from first article approval to shipment. It depends on volume, shift, and whether the supplier has reserved capacity. A supplier running at full capacity may take longer to start your initial order than one with slack.

How to write a clear RFQ for fair comparison

A poor RFQ produces useless quotes. If your request is vague, each supplier will fill in gaps differently. The result is apples and oranges.

Start with the part. Include a 3D model and a 2D drawing. State the material, surface finish, and any special requirements. If the part is a bracket, say so. Do not assume the supplier will guess the application.

State the quantity. An annual volume is useful, but the first year volume is more important for cash flow. If the first year is 50,000 parts and the second year is 200,000, say both. This tells the supplier whether to price for volume or for startup.

State the delivery window. If you need parts by a specific date, include that date. If you are flexible, say so. Flexibility can lower cost because the supplier can schedule tooling and material more efficiently.

State your quality expectations. Include the inspection method, sampling plan, and any certifications. If you need PPAP, state it. If you need a specific tolerance class, state it. Do not leave quality to interpretation.

State the payment terms. Net 30, net 60, or deposit structure changes the supplier’s willingness to take on tooling risk. A supplier that requires a full tool deposit is not the same as one that accepts partial payment.

How to compare quotes fairly

Do not compare the unit price alone. Break each quote into components.

Tooling cost: one-time or amortized.
Material cost: per kilogram or per part.
Production cost: per shot or per part.
Quality cost: inspection, PPAP, or audit fees.
Logistics cost: freight, packaging, and customs.

If one supplier quotes $0.80 per part with a $5,000 tool deposit, and another quotes $0.95 per part with tooling included, the first quote looks cheaper. Over 10,000 parts, the difference is $1,500. Over 100,000 parts, it is $15,000. The first quote may be better if your volume is low. The second may be better if your volume is high.

Check the assumptions. Did the supplier use the same alloy? Did they assume the same cycle time? Did they include scrap? If the assumptions differ, the quotes are not comparable.

How to run initial orders without surprises

Initial orders are not just production. They are a test.

The first order should be small enough to manage risk but large enough to reveal process issues. A single pallet of 1,000 parts is a reasonable starting point for many projects.

Check the first article. Do not accept a sample that was made on a different die or a different shift. The first article should come from the production die and the production process.

Check the packing. If the parts are damaged in transit, the supplier’s packing method is a problem. If the parts arrive in a mixed lot, the traceability is a problem.

Check the communication. If the supplier misses a date and does not call, that is a red flag. If they call and explain the delay, that is a good sign.

Check the paperwork. CoCs, PPAP, and inspection reports should arrive with the parts. If they arrive late or are missing, the onboarding process has a gap.

How to qualify the supplier beyond the quote

Supplier evaluation is not a one-time event. It is a process.

Visit the facility if possible. Look at the die storage area. Look at the scrap bins. Look at the calibration tags on the measuring equipment. A facility with organized tooling and clear documentation is easier to work with than one that relies on memory.

Check the process control system. Ask how they manage die life. Ask how they handle changes to the part or the material. Ask how they respond to a customer complaint. The answers should be specific. “We monitor it” is not an answer. “We take a measurement every 500 shots and log it in the MES” is an answer.

Check the financial stability. A supplier that is over-use may cut corners to survive. A supplier that is growing may have capacity. Ask for their recent financials or a credit report.

Check the culture. Do they treat your part as a priority or as a commodity? If they ask about your design, they are engaged. If they only ask about price, they are transactional.

How to manage the transition to production

Once the initial order is approved, the transition to full production is a new phase.

Update the drawing. If the first article revealed a design change, put it in writing. Do not rely on email threads.

Lock the tooling. If the part is stable, ask the supplier to mark the die with a revision. If the part changes, the die may need modification.

Set the review cadence. A monthly production meeting is better than a quarterly review. Catch small drifts early.

Keep a second source. Even if the new supplier is strong, keep the old supplier warm. If the new supplier has a die failure, a material delay, or a capacity conflict, you need a fallback.

Cost and lead time drivers

Cost Driver	What It Is	Typical Impact
Tooling	Die set design, machining, and finishing	High one-time cost
Material	Raw alloy and certification	Medium recurring cost
Cycle Time	Shots per hour	Higher cost for slow cycles
Scrap Rate	Parts rejected during production	Higher cost for high scrap
Quality System	Inspections, PPAP, audits	Higher cost for strict systems
Logistics	Freight, packaging, customs	Variable cost
Payment Terms	Deposits and credit	Cash flow risk
Capacity	Shifts and machine availability	Lead time risk

The table above summarizes the main levers. A supplier can move any of these levers. Your job is to know where they are and why.