hakkai inc.
Most recent update: 2026-03-04
PR message
hakkai inc. offers expertise with ultra-fine precision plastic parts which are used in various products ranging from items that help you in your everyday life like home game consoles, Blu-ray and DVD players, PCs, digital cameras, video cameras, mobile phones, wristwatches, flatscreen TVs and automobiles, and to machine tools employed at factories.
Our mold-building techniques, being packed with our unique know-how, are what allows our company to perform fine, precision plastic molding. We perform speedy design and rolling analysis with 3D CAD tools and have numerous state-of-the-art machines, such as ultra-fine wire cutters for wire diameters of 20 microns, to answer tough customer demands with optimal mold construction.
At our molding factory, we have reached numerous achievements and gained experience mass-producing small precision parts weighing 20 tons or less with our 145 injection molding machines that run unmanned 24 hours a day. We are producing over 100 million units a month for roughly 600 product types. We engage in a wide range of business with clients from leading companies, whose brands are well-known nationwide, to companies that are prominent despite lacking name recognition.
Our superior technical prowess is also present in the development and manufacture of all types of automated machinery. For rotor assembly equipment, we can do insert molding of the world's smallest gears which are used in wristwatches.
We began accepting orders for prototypes and small lots as a new business in April 2009. We offer quick delivery of small products weighing 20 tons or less at low cost with our complete production system.
In 2008, hakkai was selected as one of the Ministry of Economy, Trade and Industry's "300 Energetic Small to Medium Manufacturers" and in 2009 we were selected as one of the "1,400 Job-Creating Firms - Leaders in Training and Investment into Human Resources”.
The picture shown is relay coil bodies for automobiles.
The product is, in which a relay coil and a body that holds a card and a terminal are joint together.
Also, by joining with a case, it prevents dust from invading.
For automobile parts, it is very important to have contamination prevention.
However, because there are countless possible ways for foreign substance to contaminate the products, burrs on molded products and gate dust occur during the molding leading to contamination, it is impossible to prevent contamination completely even the clean room is used effectively.
Due to such reasoning, to have perfect contamination prevention, it is must have strict quality control while having high-precision mold assembling techniques, mold management and mold maintenance techniques.
Please consult us, hakkai, for any automobile parts.
This machining sample was processed by the wire-electrical discharge machine with the wire 0.02mm in diameter.
Processing name : Snowflake
Processing method : The wire electrical discharge machining (using the wire diameter Φ0.02mm)
Processing size : in Diameter Φ1.0mm, Thinnest Φ0.04mm
This is one of the technologies that support ultra-precision molds of hakkai.
This sample was processed by the 0.05mm Small-hole Drilling Electrical Discharge Machine.
0.05mm is the almost smallest diameter processed by Pinhole Drilling EDM.
We processed it by use of the electrode 30μm in diameter.
(This electrode was also produced in hakkai.)
Processing Material : PD613
Processing Method : Hi-speed Small-hole Drilling EDM
Pinhole processing size : Diameter Φ50μm × Depth Φ0.5mm × 20 pcs
Electrode diameter : 30μm
This is one of the technologies that support ultra-precision molds of hakkai.
Name：Holder
Usage：Lens holder. This affects the quality of photos.
Molding resin: PA
Use : Watch
This is parts for fixing and driving minute hand of the clock,
Gear shapes which is ultra-fine precision are provided by Processing precision mold technology of hakkai.
We stabilize supply our high quality products by the rigorous quality control and molding technology.
This sample is test processing of thread shape.
Work : SKH51
It is a difficult processing, because the work has high hardness.
We need to improve the technology required to increase the precision and reduce machining time.
hakkai continue to challenge improvements of presicion die mold processing technology.
Parts built for interior of controlled relays.
They report magnetic attraction and spring stress to the electrical contact.
When burrs occur, burrs will be omitted if the relay is active, leading to inferior contact while attempting electronic contact.
Our company has an ability to build high-precise molds while enforcing strict mold management to supply the best quality products.
We also can manufacture products with “Made in Japan” technology along with quality from Thai (Ayutthaya) and China (Suzhou) factories.
Use : CASE of control relay in-car
To prevent dust, water and trash, these products are required highly sealing performance.
It is molded in our clean room in order to avoid product failure of contamination.
 |
Thin wall molding（ Mass production / Plastic ） |
|---|
| Company name | hakkai inc. | Website URL | http://www.hakkai.co.jp/english2/ |
|---|---|---|---|
| Street address |
Minamiuonuma Niigata Japan
[See map] |
Person in charge | yoshiaki sato |
| Telephone number | +81-25-777-2410 | Fax number | +81-25-777-2881 |
| Capital | 57,300,000 JPY | Employees | 182 |
| Annual sales | 2,092,000,000 JPY | EMIDAS Member Number | 72463 |
| Type of manufacturing | Audio-video equipment / Electronic parts / Electrical component for transportation equipment | ||
| Main 3 products |
|
||
| Primary clients |
|
||
| Large | Medium | Small |
|---|---|---|
| Designing | Mold designing | Injection molding die |
| Designing | Simulation | CAE fluid analysis |
| Development and production of prototype/Small-scale production | Electrical discharge machine | Wire electric discharge machining Micro hole machining Electric discharge machining |
| Development and production of prototype/Small-scale production | Grinding processing | Plane grinding Form grinding |
| Development and production of prototype/Small-scale production | Prototype processing | Small-size prototype manufacturing |
| Die manufacturing | Plastic mold | Designing Manufacturing Part processing Mold base machining 3D modeling Injection molding die Insert molding die Below 60 t Cassette-type molding die Thin wall injection molding die Injection molding die for microfabrication (5 mm or smaller) Core and cavity machining |
| Mass production | Plastic | Insert molding Engineering plastic PBT (polybutylene terephthalate) PPS (polyphenylene sulfide) LCP (liquid crystal polymer) Below 60 t Injection molding Thin wall molding |
