HEIWA SANGYO Co., Ltd.

Jul/28/2026

Multi Tasking
Automation

A group of essential workers who support infrastructure

"We are committed to a style of directly listening to the requests of our prime contractors." This is the business philosophy of Heiwa Sangyo Co., Ltd. (Minato-ku, Tokyo, CEO Yasuhiro Yao), which handles products for aerospace and defense sectors. They strongly believe that continuously supplying millions of types of parts in small quantities is essential to the manufacture of high-quality parts for the industry.

In-house jigs / tools that support the business

Heiwa Sangyo Co., Ltd. was founded in 1963 by Takao Yao, the father of the current CEO Yasuhiro Yao, as a tool trading company. It was incorporated in 1967 and started its machining business, including mold manufacturing. In addition to its head office, the company has six factories in Chiba, Tochigi, Nagano, Mie, and Nagasaki prefectures. To avoid the risk of supply chain disruption, each location is connected by a video conferencing system to ensure a stable supply chain.

Since its founding, the company has adhered to a business approach of listening directly to the requests of its main contractors. "In order to provide high-quality products that meet requirements, we do more than just follow the contract drawings — we work to build open, candid relationships with our clients," says Mr. Yao.

In the case of aircraft, once a company starts working on a part, it must continue producing the same part for decades. The company has a proven track record of reliably supplying high-quality parts for years, which has led to earning great trust from prime contractors. As a strategy to thoroughly pursue quality and achieve the required quality, the company also manufactures jigs and tools used in its machinery in-house. "Among the tools, almost all of the end mills are manufactured in-house. Our strength lies in being able to freely manufacture them according to the characteristics of the machines in operation and the applications says Atsushi Kusakabe, Chief Marketing Officer West Area.

Yasuhiro Yao, CEO

CEO Yao (center) and employees working at the Komagane factory.

Applying dedicated pallets for maximum productivity

The company's first Mazak machines were the INTEGREX e-1060V and VARIAXIS 730-5X, introduced in 2001. "We wanted to test the difference between the milling-type simultaneous 5-axis machines from other companies that we had been using up until then, and the turning-type machines," said Mr. Yao. At their Funabashi and Ichikawa factories in Chiba Prefecture, they have installed seven machines, starting with the INTEGREX e-1060V in 2004, followed by the INTEGREX 200-IVS, INTEGREX i-450H S, INTEGREX e-670H, VORTEX i-800V/8, etc.

The Komagane Factory, which primarily handles the manufacturing of aircraft-related products, has introduced the INTEGREX e-1250V/8 (2015) and INTEGREX i-200H S (2024), among others. The manufacturing line, which consists of six INTEGREX e-1250V/8 machines arranged in sequence, is custom-built to meet specific requirements. It is equipped with a dedicated tool clamp angle head tool rack on a pallet, in order to cut the inside of the huge engine case.

The Komagane Factory handles a wide range of products for the aerospace and defense sectors, from aircraft components to engine cases. Therefore, it is difficult to summarize the effect of introducing Mazak machines but CMO and West Site Manager Kusakabe says, "Processing time was cut by roughly one third after the introduction." Production efficiency is expected to increase even further once the double-column 5-axis machining center VERSATECH is installed and the currently under-construction No. 6 Factory becomes fully operational.

Komagane Factory, located at the foot of the central Japan Alps

INTEGREX e-1250V/8 equipped with a custom-designed clamp angle head tool rack for engine case production.

A workplace that maximizes employees’ experience

The company's product range, encompassing not only the aerospace and defense sectors but also trains and power generation equipment, all have requirements for long-term, small-volume supply. Mr. Yao's proud emphasis on "dedicating oneself to subcontracting" stems from the fact that the company positions itself as a group of essential workers supporting the social infrastructure.

Therefore, while maintaining close cooperation with each of the main contractors, the company is also focusing on creating an environment that enhances the "value of human resources" within the company by combining the strengths and knowledge of employees with diverse skills. "By being dedicated to being a professional subcontractor and accumulating small successes, we want our employees to experience the joy of manufacturing. If we can provide a place where each individual's experience can be utilized to the fullest, our overall capabilities will naturally increase," says Mr. Yao.

The company is not limiting itself to its core business of cutting, but is expanding its processing areas to drive improvements in product unit prices. It plans to actively pursue capital investments and factory expansions aimed at unmanned and automated operations, striving to improve productivity while maintaining reliable quality.