Essential Core
Manufacturing
The Manufacture of Pivotal Products that Shape Society
Essential Core
Manufacturing
The Manufacture of Pivotal Products that Shape Society
Essential Core
Manufacturing
The Manufacture of Pivotal Products that Shape Society
Autoplay
About ESTOH
Company Profile
| Company Name | ESTOH Co., Ltd. |
|---|---|
| Head Office |
3-6-17 Tatsumihigashi, Ikuno-ku, |
| Establishment | February 2, 1991 |
| Investment | YEN 62,000,000（as of March 31,2025） |
| Representative | Kenji Nakamura, Representative Director and President |
| Employees | 120（as of March 31,2025） |
| Business Overview | Design and manufacture of ultra-precision molds and manufacture of ultra-precision injection molded products. |
Message
Supporting the safety and comfort of society through uncompromising precision and integrity in manufacturing
As a member of the NOK Group, ESTOH Co., Ltd. manufactures precision plastic products, including gaskets for lithium-ion batteries.
The parts we handle are as small as a fingertip, yet they are crafted with uncompromising precision down to a few microns, incorporating the advanced mold design and injection molding techniques we have cultivated since our founding. No matter how small the part, our unwavering commitment to "quality first" manufacturing is the core of Estoh’s technology, resulting in safe and durable products.
We will continue to take on bold challenges to realize next-generation mobility and a prosperous society by making full use of our global group network and unique technologies.
- Representative Director and President
- ESTOH Co.,Ltd.
Origin of Company Name
The “ESTOH” name embodies the idea that we should “Get ahead of the times with creativity and enthusiasm”.
Locations
Headquarters Plant
3-6-17 Tatsumihigashi, Ikuno-ku,
Osaka 544-0014, Japan
Hirano Plant
4-4-6 Kamikita, Hirano-ku,
Osaka 547-0001, Japan
Joto Plant
4-2-29 Imafukunishi, Joto-ku,
Osaka 536-0004, Japan
History
-
1991
-
1991
Established in Ikuno Ward, Osaka City
Started production of connectors and coin cell gaskets -
1992
Development of degassing metal -
1993
Started integrated mold production starting from design -
1995
Started production of cylindrical lithium-ion battery gaskets -
2000
-
2000
Development of square lithium ion battery gaskets -
2003
Started operations at Hirano Plant -
2004
ISO 14001 certification -
2005
ISO 9001 certification -
2010
-
2011
Completed the new Hirano Plant -
2014
Development and installation of molding and automatic inspection equipment -
2018
Completion of cleanroom at the Hirano Plant -
2020
-
2021
Completed showroom at the Hirano Plant IATF 16949 certification -
2023
Started operations at ESTOH North America Co., Ltd -
2023
Become a consolidated subsidiary of NOK Corporation
Business & Product
Core Competency
Compact Size
The reduction in the size of items such as personal computers and smartphones has created demand for molding technologies for very small sizes. ESTOH has succeeded in the mass production of gaskets for automotive lithium-ion batteries with a precision of 1/1000 mm.
Mass Production
We operate state-of-the-art molding machines to produce precision injection molded products at high speed, 24 hours a day. We have production facilities that can stably supply more than 400 million high-quality plastic products per month.
High Quality
Our quality policy is to “Provide peace of mind for our customers” and we have a thorough inspection line with high detection performance. We perform high-level quality checks by using state-of-the-art three-dimensional measuring equipment, tool microscopes, automatic measuring instruments, and dedicated jigs with 1/1000 mm precision.
Quality Management
We acquired ISO 14001 certification in July 2004 and ISO 9001 certification in March 2005. Furthermore, in 2021, we acquired the “IATF 16949” international standard certification for quality management systems, which is specifically for the automobile industry.
We are also considering ESG investment that will create value unique to ESTOH in order to respond to social needs such as SDGs. From now on, we will continue to offer quality that satisfies our customers as we also promote environmentally friendly business activities.
ISO9001 Quality System Registration Certificate
Registration Identification
Number: 10395525
Date of initial registration: March 9, 2005
ISO14001 Environmental System Registration Certificate
Registration Identification
Number: 10299469
Date of initial registration: July 3, 2004
Business Flow
Sales and Development Support
We carefully listen to the product specifications required by the customer. We make a proposal using the know-how accumulated at ESTOH so far, and confirm the customer’s intention in a meeting.We then propose the optimal direction for the manufacturing.
Mold Planning and Design
One strength of ESTOH is the fast speed at which we move from planning to design and the start of production.
Our designs bring together all our unique know-how regarding aspects such as runners, cooling and gas removal and make cost reduction possible.
Mold Production
We produce high performance, long-life precision molds.
Our tolerance range for precision in the main parts is only 2 µm.
We fully utilize our technology, which we have continued to improve by being strict about precision.
Injection Molding
We perform the high-cycle mass production of high-quality and high-precision products.
We have also established a production system that can respond quickly to requests such as “We want to change the shape”.
Quality Inspection
We implement an inspection system that goes even further than the high quality requirements of our customers.
The result of this has been the achievement of zero external claims.