A mould or die made in Japan is often bought for one reason: it has to run for a long time and hold its dimensions while it does. The risk sits elsewhere. The tool is built and trialled on a press in Japan, then shipped to a factory abroad with a different press, different water fittings, a different hot-runner controller and a resin from a different lot. A tool that ran well at the toolmaker can arrive and not even fit.
💬 Having a mould or die made in Japan for a factory in another country? We carry the press data, the specification, the trial and the export between you and the toolmaker as part of sourcing from Japan. Tell us about the part and the press.
This article covers the engineering and logistics: what the toolmaker needs to know about your press, what goes in the specification, how to run the trial in Japan, how the tool is exported and how it is maintained once it is abroad. Who owns the tool and how to recover it is a contract question, covered in mould and tooling ownership: the clauses to sign.
Start from the press the tool will run on, not the part
Send the toolmaker the data sheet of the actual press at your plant before design starts, because a mould designed for the toolmaker’s trial press may not fit yours.
A Japanese toolmaker will design to the press data it is given. If it is given none, it will design to a press it knows — usually its own trial press. Problems found on arrival are expensive because they are physical: a locating ring that does not match, a mould that is too tall for the daylight, an ejector pattern that does not line up.
| Press data the toolmaker needs | Injection mould | Press die |
|---|---|---|
| Force | Clamp force | Press capacity and the working point of the stroke |
| Space | Tie-bar spacing, platen size, minimum and maximum mould height | Bolster and slide area, shut height range |
| Alignment | Locating ring diameter, nozzle tip radius and orifice | Die-set guide arrangement, slide centring |
| Ejection or feed | Ejector rod pattern and stroke | Feed line, pitch, coil width, transfer or progressive |
| Clamping | Clamp slots, bolt pattern or quick-change system | Die clamping method, bolster T-slots |
| Services | Water circuits available, hot-runner controller zones and connector type, core-pull hydraulics | Air, sensors, die cushion |
| Handling | Crane capacity and lifting thread size | Crane capacity, die cart or rollers |
Send the data sheet and a photograph of the press nameplate. If the tool must run on two different presses, say so, and agree which one is the design basis.
What goes in the mould or die specification
A written specification sheet — signed before steel is cut — is the only way two companies in two languages end up with the same tool in mind.
Japanese toolmakers commonly work from a specification sheet (仕様書) that the buyer and toolmaker agree. Fill it in yourself rather than accepting a blank template, and include at least:
- Part and resin or sheet. Part drawing at a stated revision; resin grade, not just resin family; sheet grade and thickness for dies.
- Cavities and runner. Number of cavities, cold or hot runner, gate type and position, and whether gate position needs your approval.
- Steel and hardness. The steel for each main component and its hardness. A Japanese toolmaker is likely to name steels by JIS grade or by a steelmaker’s own grade name; ask for the composition and hardness so your toolroom can match them. If a local repair shop will have to weld or replace inserts, tell the toolmaker so it can choose steels that can be repaired where the tool will live.
- Cooling. A cooling circuit diagram, the fitting type and thread on each connection, and circuit numbering marked on the tool.
- Electrical. Hot-runner zone count, heater voltage, thermocouple type and connector wiring — matched to your controller, not the toolmaker’s.
- Standard components. Ejector pins, guide pins and springs as catalogue standard parts, with the list supplied, so you can buy replacements locally or order them from Japan.
- Marking and counters. Tool number and owner marked on the tool (the ownership article explains why), circuit labels in English, and a shot counter if you want wear data.
- Texture and polish. The finish standard for each surface, with a sample plate if the appearance matters.
Water fitting threads deserve a specific line. Unless told otherwise, a toolmaker fits the threads and couplings it uses every day. Japan’s standard for taper pipe threads is JIS B 0203, which the Japanese Standards Association lists as a modified (MOD) adoption of ISO 7-1:1994, reaffirmed in October 2024. If your plant uses a different pipe-thread system or coupling type, the fittings will not seal or connect without adaptors. Name the system the tool should carry. Checked on the Japanese Standards Association catalogue on 19 October 2026.
The trial in Japan: what to see before the tool ships
Do not accept a tool on the toolmaker’s word that it “ran fine”; ask for a trial on a comparable press with your resin, a written trial report and measured sample parts.
Toolmakers number trials differently — some call the first shots T0, others T1 — so agree what each trial is for rather than arguing over labels. A typical sequence is a first trial to prove the tool fills and ejects, corrections, then a trial for dimensions and appearance, then a final trial for approval.
| Trial item | What to ask for | Why it matters abroad |
|---|---|---|
| Press used | Press size close to yours, stated on the report | A tool tuned on a much larger or smaller press may behave differently on yours |
| Material | Your resin grade, ideally from the lot you will run | A different grade or supplier changes shrinkage and the dimensions |
| Conditions | A full moulding or press condition sheet | It is the starting point for your own technicians |
| Sample parts | Shots from each cavity, identified by cavity number | Cavity-to-cavity variation is invisible in a single sample |
| Dimensional report | Measured values against a ballooned drawing | Lets you approve dimensions before shipping |
| Video | The trial run, including ejection | Shows sticking, drag or hand intervention |
How a moulding condition sheet should be written, and how to gate trial shots into production, are covered in injection moulding in Vietnam: four things to fix first; the approval stages for samples are in sample approval stages. Both apply equally to a tool made in Japan.
Attend the final trial if you can, or have someone attend for you. Corrections are fastest while the tool is still at the toolmaker, next to the person who built it.
💬 Can’t send an engineer to Japan for the trial? We can attend on your behalf, check the report against your drawing and send you the parts and the video. Ask us about mould trials.
Packing and exporting the tool from Japan
Export a mould like a precision machine: drain it, protect it, crate it to the destination’s wood-packaging rules and make the tool number identical on every document.
Classification. Japan’s tariff schedule places moulds for rubber or plastics of the injection or compression type under subheading 8480.71, and tools for pressing, stamping or punching under 8207.30. The importing country’s customs decides the classification on arrival, so confirm it there. Checked against Japan Customs’ tariff schedule (April 2026 edition) on 19 October 2026.
Export checks. A mould is an export like any other: the Japanese exporter screens it under Japan’s export control rules and asks about end use where needed — see Japan export control: list control and the catch-all check. The invoice, origin and consumption-tax points are in export from Japan: how a purchase becomes a shipment.
Physical preparation.
- Blow out and dry every water circuit; trapped water corrodes the circuits in transit.
- Apply rust preventive to cavity, core and moving parts, and close the tool with its safety strap or locking plate.
- Crate it on a skid suitable for a forklift and the weight. Wooden packaging must meet the importing country’s rules; many apply ISPM 15, the international standard on regulation of wood packaging material in international trade.
- Pack spare parts, electrodes if agreed, the trial samples and the documentation in a labelled box, with a list.
- Put the tool number, the same number engraved on the tool and used in the contract, on the invoice, packing list and crate.
If you expect the tool to return to Japan for major repair or modification, tell the forwarder at the first export. Returning a tool is easier when the original export documents identify it clearly.
The first run at your plant
Treat the first run abroad as a new trial, not a formality: re-establish the conditions on your press, measure again and only then release production.
The conditions sheet from Japan is a starting point. Your press, your temperature controllers, your water temperature and your resin lot all differ, and the first parts may differ too. Budget time for a short qualification run, measure the parts against the same ballooned drawing used in Japan and compare cavity by cavity.
Agree in advance what happens if the parts are out on arrival: whether the toolmaker supports remotely from photos and measurement data, whether it sends an engineer, and who pays for corrections that turn out to be caused by the tool rather than the process.
Maintenance and repair once the tool is abroad
Plan for wear on day one: get the tool drawings, a spare-parts list and a maintenance routine, and decide which repairs will be done locally and which will go back to Japan.
| Item | Ask for it at | Why |
|---|---|---|
| 2D and 3D tool design data | Contract signature | Without it, a damaged insert has to be reverse-engineered |
| Spare-parts list with standard part numbers | Final trial | Lets you stock wear parts before they fail |
| Spare inserts for high-wear areas | Order, as a priced option | Shortens downtime when a gate or a punch wears |
| Maintenance instructions in English | Shipment | Your toolroom needs cleaning, lubrication and inspection intervals |
| Shot or stroke counter readings | Every maintenance | Links wear to production so you can plan refurbishment |
Decide, too, whether design data is delivered at all. It is not automatic in every toolmaking contract, so write it down. The commercial side of wear and replacement — who pays and when the tool counts as worn out — sits in the ownership clause, not in the technical specification.
For parts that sit inside the tool, such as small precision inserts made to replace a worn original, see precision machining in Japan for prototypes and small lots. If the press itself is coming from Asia, see buying Taiwanese machine tools and injection moulding machines, and for an overview of the wider equipment range we source, the industrial sourcing page.
💬 Want one team to send your press data to a Japanese toolmaker, attend the trial and ship the tool to your plant? Start with your part drawing and press data sheet.
Frequently asked questions
1. Can a mould made in Japan run on a press made in another country?
Yes, if it is designed to that press. Send the toolmaker the press data sheet before design starts: tie-bar spacing, platen size, mould height range, locating ring, nozzle radius and ejector pattern.
2. Should the trial in Japan use my resin?
Yes, ideally the same grade from the lot you will run. A different grade or supplier changes shrinkage and the measured dimensions, so the trial report would be approving a different part.
3. Will the water fittings on a Japanese mould fit my plant?
Not necessarily. Japan’s taper pipe thread standard is JIS B 0203, a modified adoption of ISO 7-1, and couplings vary too. Tell the toolmaker which pipe-thread system your plant uses and have the tool built to it, or plan adaptors.
4. What HS code is used to export an injection mould from Japan?
Japan’s tariff schedule places injection or compression moulds for rubber or plastics under 8480.71 and press tools under 8207.30. The importing country’s customs decides the classification at arrival.
5. Should I ask for the mould design data?
Yes, and write it into the contract. With 2D and 3D tool data, a worn or damaged insert can be remade locally or elsewhere; without it, the tool has to be reverse-engineered.
Sources: Japan Customs, Japan’s Tariff Schedule (as of 1 April 2026), headings 82.07 and 84.80; Japanese Standards Association catalogue entry for JIS B 0203:1999 (MOD ISO 7-1:1994, reaffirmed 2024-10-21); International Plant Protection Convention, ISPM 15 listing. Checked on 19 October 2026.
More industrial sourcing guides: Buying Japanese Injection Moulding Machines and Presses · Plastic Extrusion in Vietnam: Dies, Dimensions and Regrind · Precision Machining in Japan for Prototypes and Small Lots. All guides by category are on the industrial sourcing page.