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MJ Factory

MJ factory

Mechanical Joint (MJ) factory is located in Ota, a city in southeastern Gumma.There are 77 employees working at the facility. MJ factory is divided into three sections: production, operation, and quality assurance.


The two subdivision the production section, manufacturing unit and test unit, is the operation centre of MJ factory, and contributes more than 40 years of knowledge and experience in plastic working of metal to our services.


Plastic working is a technique of applying pressure to materials to obtain desired shapes of products. This method enables to reduce the amount of materials used and the production cost. Also, it is an easy and efficient way of customizing product designs for our clients' commissions.



We do not consider the role of a factory should be limited to production. We invite factory visitors for them to experience the unique values we deliver. Your opinions would be greatly appreciated and help us further improve our services.


Please see how our Mechanical Joints are made, and check their quality with your own eyes! We are looking forward to your visit to our factory.


MJ Factory General Manager
Tsukada Kazuyuki

Our Advantage

  1. We offer everything plastic working can do.
    We value creativity at work.
  2. "A factory we can show"
    Clean, organized workplace and good training for employees; these form the basis for product quality, cost reduction, work efficiency and safety of workers.
  3. Improving quality assurance
    We ensure no problems with our facility, tools, materials/parts and workers' behaviours to prevent defection.

Messages from Section Managers

Production Section
Section Manager
- Masaya Komoike


Every staff puts their heart into delivering best products to our dear customers!

Quality Assurance Section
Section Manager
- Michiko Kaneko


As the first woman to become a manager at MJ factory, I do my best to enhance our product quality.

Operation Section
Vice Section Manager
- Naotada Osawa


Everyday is a struggle with due dates, but we cooperate to gain the trust from our customers.


5-1, Rokusengoku-cho,Ota-city, Gunma 379-2305 JAPAN


Phone +81 277-78-4119 / Fax +81 277-78-7721

BV1 Factory

BV1 factory

BV1 factory is one of our manufacuring facility in Thuan Dao Industrial Park, Long An Province, Vietnam, 40 km into the West from Ho Chi Minh.

The factory has conducted business with clients in Vietnam since 1996, one of the first transaction being with the Vietnamese Ministry of Defence.

In 2011, The factory was incorporated as a local subsidiary with funding from Benkan corporation, and 300 employees are working at the facility as of present.


The factory boasts the fine technology of lost wax casting, as well as plastic working developed in Japan since 1947.


Lost wax casting is a method of casting where a solid wax model of final product is used to make a sand mould. The sand mould is then filled with molten stainless steel to obtain a casting. After solidified, the casting undergoes mechanical processing to become a final product. With this method, we can obtain complex shapes otherwise difficult to make, and mass-produce them with uniform quality.




Furthermore, since it is difficult to outsource such advanced technologies as degreasing, acid cleaning and heat treatment in Vietnam, BV1 factory is equipped with all the necessary facilities to complete production, which allow us a full control over the entire manufacturing process from material injection to finish.


Although situated far away from Japan, BV1 Factory showcases those unique techniques, in which resides the spirit of Japanese craftmanship.

BV1 Factory General Manager
Naoaki Shinoda

Our Advantage

  1. Workplace full of young energy
    The average age of the employees is 30 years. We exchange fresh ideas everyday, working on various projects to improve our services.
  2. Expertise in metal processing
    Our staff is well-acquainted with metalwork. With the advanced technologies of lost wax casting and plastic working, we are ready to meet our customers' specific needs.
  3. Thorough quality assurance
    We proudly offer our quality products, with which we obtained ISO 9001 certification, as well as the Japanese standard for stainless steel fittings, SAS 322.

Messages from Managers

Supervisory Section
Manager - Binh


Our strength is high levels of plastic working and casting skills.

Plastic Working Section
Manager - Suc


We keep our work environment organized and ready to answer requests from MJ factory.

Casting Section
Manager - Hai


We promise you a high quality of products using cutting-edge technology of lost wax casting!

Logistics & Materials Management
Manager - Thuan


We are making effort to facilitate information exchange and mutual cooperation in our section.

Quality Assurance
Manager - Shingo Tanifuji


We communicate with members trained at MJ factory to deliver orders and instructions from MJ factory to our staff.

General Affairs
Manager - Bich


Under the supervision of General manager, Shinoda, we protect the safety of our staff by reminding them of possible risks at work

Accounting Section
Manager - Wan


Financial management is crucial to the factory, and mistakes are not allowed.
We coordinate well with other sections for careful decision-making.


Lot F7, Street No.01. Thuan Dao IP expansion phase, Long ??nh Town,

C?n ???c District, Long An Province, Viet Nam.

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Please contact us if there is any question or request about our services or stainless steel piping.

Contact us by Telephone

Contact us by email

The List of Our Partners

The list of BENKAN’s business associates is available here. Click the company names to find further information on their websites.

ERE (Shanghai) Trading Co., Ltd