Most buyers ask this question expecting one number. The useful answer is a range plus the stage dates that produce it, because a mold that is late is almost never late at the end — it is late at one specific stage nobody reported.
The short answer
For a two-plate tool with a moderate core and cavity, plan 25 to 45 calendar days from design freeze to the first trial shot. Simple single-cavity tools sit at the short end. Multi-cavity hot runner tools with cosmetic requirements sit at the long end, and can exceed it. Prototype and bridge tools built in aluminium or soft steel commonly run 12 to 26 days, because they skip hardening and the long finishing cycles.
Two clarifications save a lot of argument later. First, lead time starts at design freeze, not at the enquiry — the quotation and DFM review that precede it are days of their own. Second, the clock includes the trial shot but not your approval loop after it; if your team needs a week to evaluate samples, add that week.
| Tool type | Typical range | What sets the range |
|---|---|---|
| Prototype tool, aluminium | 12–15 days | Single cavity, soft material, no hardening |
| Bridge tool, soft steel | 15–18 days | Cavity count above one, limited shot life |
| Two-plate production tool | 25–35 days | Cavity count, texture, ejector layout |
| Three-plate or hot runner | 35–45 days | Runner design, manifold lead time, gate balancing |
| Hardened tool, S136 or H13 | 40–50 days | Heat treatment cycles, post-hardening finishing |
These ranges describe our own work and reflect what we will commit to in writing. Treat any figure you receive without a stage breakdown as a wish rather than a schedule.
What the days are made of
Eight stages account for almost all of the calendar. When you receive a quotation, ask for a date against each one: that is the difference between a schedule and a promise.
| Stage | Working days | What you should see at the end |
|---|---|---|
| DFM review and design freeze | 2–4 | A written list of wall thickness, draft, gate and shrinkage points, resolved |
| Steel order and material in | 3–7 | Mill certificate for the grade specified |
| Rough machining | 4–6 | Plates roughed with stock left for finishing |
| Heat treatment (if specified) | 3–5 | Hardness report at the specified HRC |
| Finishing: CNC, EDM, wire, grind | 6–10 | Cavity and core dimensioned against the model |
| Spotting and assembly | 3–5 | Fit checked on blue, shut-offs verified |
| Trial shot and sample evaluation | 2–3 | Trial report with process settings and part measurements |
| Correction round | 2–4 | A second report showing the corrected feature |
Why the stages matter more than the total. A total of 40 days can hide a build that is already two days behind at the steel-arrival stage. A stage list cannot, because a missed date sits next to a named stage instead of vanishing into a final date that is still weeks away.
What adds weeks
In our experience the largest schedule losses are not machining problems. They are decisions that arrive late or change.
| Cause | Typical cost | How to prevent it |
|---|---|---|
| Design revision after steel is cut | 5–15 days | Freeze the drawing, then log changes as a new revision with its own cost and date |
| Non-standard steel grade | 5–10 days | Accept an equivalent grade with a documented substitution, or order early |
| Hot runner from a third party | 10–20 days | Place the manifold order at design freeze, not at finishing |
| Cosmetic texture decided after trial | 3–8 days | Approve the SPI or texture sample before cavity finishing |
| Unresolved DFM point | 2–10 days | Clear every open DFM row before design freeze |
| Slow sample approval on your side | your call | Name the approver and the criteria up front |
Compressing honestly
A shorter schedule is usually available. What is not available is a shorter schedule with no cost. There are two legitimate accelerators, and one that is not.
- Run tasks in parallel. Electrode making can start while plates are still being roughed, and standard components can be ordered at design freeze. This is real compression and we will quote it as an option.
- Freeze earlier. The cheapest week you can save is the week spent waiting for a decision on draft angle. A complete drawing set on day one is worth more than any machining improvement.
- Do not skip the trial shot. A tool that ships without a trial has not been proven; it has only been built. The defect you did not look for arrives at your molding machine, in production hours, when fixing it costs far more than the days saved.
If your launch date genuinely cannot accommodate a production tool, the honest recommendation is a bridge tool at 30–45 % of a hardened tool's cost, delivering saleable samples in roughly three weeks while the production tool is built in parallel.
On the numbers in this article. The ranges reflect typical work in our facility and will vary with geometry, cavity count and material. They are offered so you can size a project before contacting us, not as a commitment. The commitment is what appears in your quotation.
What is a realistic lead time for a new injection mold?
For a typical two-plate tool with a moderate core and cavity, plan 25 to 45 calendar days from design freeze to the first trial shot. Simple single-cavity tools run at the short end; multi-cavity hot runner tools with tight cosmetic requirements run at the long end or beyond. The number that matters is not the total but the stage dates you receive with the quotation.
Can a mold be built faster?
Yes, but speed is bought with money or with sample quality, and the trade must be explicit. The two honest accelerators are running roughing and electrode making in parallel, and freezing the design early instead of revising it mid-build. Skipping the trial shot is not an accelerator; it moves the discovery of a defect to your production line.
What delays a mold most often?
Late or changing design input. A drawing revision after steel is cut can cost more days than the whole finishing stage. After that: steel grade availability, an unresolved DFM point, and a customer-requested cosmetic change after the first trial.
Does the lead time include the trial and samples?
Yes. The range runs to the first trial shot and the samples from it. Your own evaluation time and any correction round after that sit outside the quoted number unless we have agreed otherwise in writing.
Put a date against your own drawing
Send the 3D model and required date. We return the stage schedule, the tolerance we can hold and the record set that travels with the tool.
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