Corporate Profile
Management Philosophy・Corporate Profile
Management Philosophy
We are committed to handing down and developing casting technology, contributing to society through high quality craftsmanship, and are striving to go down in history as a company of value
Corporate Profile
- Company Name
- Koiwai Co., Ltd.
- Managing Director
- Toyomi Koiwai
- Foundation
- 1973
- Capital
- 20 million yen
- Head Office Location
- 60 Soya, Hadano-shi, Kanagawa 257-0031
- TEL
- +81-463-83-8140
- FAX
- +81-463-83-8141
- Main Business Line
-
- Production of sand mold prototypes made of materials such as aluminum, magnesium, cast iron, ductile and lead
- Mass production of aluminum products using metallic mold casting
- Machining of casts
- Modeling operations using 3D-CAD
- Fabrication of metal molds, resin molds and optical molding products using 3D-CAD data
※In the field of auto parts, Koiwai has casting experience in all types of casts used in automobiles.
- Number of employees
- 55
Locations
- Main Factory
- 60 Soya, Hadano-shi, Kanagawa 257-0031
TEL +81-463-83-8140
FAX +81-463-83-8141 - Site area：2300㎡
Building area：1420㎡
Prototype division：Various automobile industries; Casting for prototypes, research and development
Mass production division：Casting for vehicles, industrial-use, outboard engines and jet skis
Production capacity: Various AI, FC, FCD Al 30 tons/month 
- Miyagi Factory
- 69-1 Kanagase, Ogawara-machi, Shibata-gun, Miyagi 989-1224
TEL +81-224-51-5370
FAX +81-224-51-5371 - Site area：6600㎡
Building area：3100㎡
Mass production division: Various casts for jet skis, outboard engines and automobile engines
Production capacity: Al 80 tons/month 
Next Koiwai, situated in an area with a distant view of the Zao mountain range in Miyagi, is actively hiring from the local community, and the average age of Miyagi factory employees is 20 years old. The young staff is acquiring skills to assume active roles as the future generation of Koiwai.
- Yokohama Factory
- 2091-16 Kamiyabe-cho, Totsuka-ku, Yokohama-shi, Kanagawa 245-0053
TEL +81-45-810-3582
FAX +81-45-810-3583 - Site area: 440㎡
Building area: 330㎡
Mold design for casts,
Fabrication of GDP and shell molds 
- Seisho R&D and Sales Engineering Division
- 244-5 Haneo, Odawara-shi, Kanagawa 256-0804
TEL +81-465-44-2015
FAX +81-465-44-2025
data-3d@tc-koiwai.co.jp - Site area: 7350㎡
Building area: 1500㎡
Production of laminated sand molds (core, master mold) using lamination process Production capacity: 10 tons/month
Cast production using lamination process
Production capacity: AI 10 tons/month
CT filming of nondestructive tests based on consignment 
Quality Policy
- Obtained ISO9001 Certification
Koiwai obtained ISO9001 certification in December 2002. We are now preparing to obtain ISO 14001 in addition to ISO9001. We are putting in an all-out effort to continuously improve QCD (Quality, Cost, Delivery) in order to provide attractive products that fulfill the needs of our customers.
Obtained ISO9001 Certification
- Aiming to obtain Eco Stage certification
In order to become a company that actively contributes to environmental issues, we have started working toward obtaining Eco Stage certification in 2009.
