Normally, metals require heat treatment (annealing) after processing, but Sangen Rasenkan Kogyo has independently developed a processing method that does not damage the material's structure and ensures that the plate thickness of the peaks and valleys does not change after forming, thus eliminating the need for a heat treatment process in deep drawing.

The bellows we manufacture are multi-layer bellows ranging from one to four layers. Compared to other companies' products, they have superior springiness (lower spring constant), are highly resistant to repeated expansion and contraction, and can achieve large expansion and contraction amounts over short spans. Currently, they are used in industries ranging from aerospace to pharmaceuticals, semiconductors, automobiles, and chemical plants, and we have received orders from over 1200 companies.

We accept orders for lengths from 30mm to 850m in 1mm increments, and we can accommodate your desired dimensions (no mold fee required).
Our standard product is made from SUS316L material, but we can also manufacture bellows from special materials such as Hastelloy C-22, Inconel 625, M Monel, and pure nickel, even for single units, with short lead times. Furthermore, we can form bellows from titanium or other undisclosed special materials if you provide the pipe, so please feel free to contact us.

Hydraulically formed bellows, inner diameter 9.5mm to 30mm
Roll-formed bellows, inner diameter 32mm to 850mm
Welded bellows, inner diameter 8mm to 160mm
We can handle a wide range of applications, from ultra-high vacuum to high pressure, and from cryogenic to high temperatures. We can also manufacture products that meet the high-pressure gas equipment testing requirements of the High-Pressure Gas Safety Act. Please contact us for details.

Flexible tubes are manufactured by forming and welding thin stainless steel sheets, then corrugating them using a high-speed spiral tube manufacturing machine, and finally undergoing solidification heat treatment.

Sizes range from 8A to 250A, and materials are SUS304 and SUS316L. All are made to order. We can accommodate special fittings and custom lengths (in 10mm increments), even for single tubes. We will deliver tubes of the appropriate length for your equipment, even just one at a time.
*Next-day shipping is available for urgent orders.

When ordering, please confirm the nominal diameter, exterior finish (bare, 1W, 2W, hoop blade, with spring, glass sleeve, etc.), overall length, and fittings.

This is a flexible stainless steel pipe developed for water supply and hot water piping, making it easy for even amateurs to install on-site (it is different from pipes for city gas and LPG).
Each roll is 25 meters long and can be cut to any length like a rubber hose. Installation is easy with simple tools, even for those who are not professionals.

While this product can be used for water supply and hot water supply, as well as air and oil piping, it is designed for fixed piping and is not suitable for locations with vibration or repeated use. In such cases, please consider using flexible tubing or bellows.
The lengths are 25m for 15A and 20A, and 10m for 25A.
The dedicated Yellow River pipes are available in 15A and 20A sizes for general use, while the 25A size is a custom order item.
The materials are SUS304 and SUS316L.

For short-length products that have passed inspections by the Japan Water Works Association, there may be cases where no inspected products are available, so please inquire separately.