Expansion Joint is used to prevent in advance the fatigue damage due to repetitive load such as heat variation and vibration generating due to the operation of different kinds of business systems.

SJM has been providing principal national production facilities, industrial systems and housing facilities with a number of products since Expansion Joint was locally developed and produced in 1975.

Especially Plant Division established the third factory in Shiwa Industrial Area in 1993. It has made itself stable as the largest and best Expansion Joint maker in the country by producing quality-oriented goods as well as by meeting customers' various requirements.

SJM products are being supplied to all fields of industry and construction. These products include precise (A)Bellows used for semiconductor facilities and precision instruments, (B)Expansion Joint required for large scale housing facilities and building HVAC, and (C)Industrial Expansion Joint necessary for production & process facilities, engines for large sized ships, and electricity systems.

SJM Plant Division is progressive and is making every effort to develop the business in a variety of directions. It is the case specifically in the area of high precision instrument and the technology of space navigation field to become leader in this future industry. In order to achieve this, SJM is engaged in constant research & development and quality enhancement with a view to playing a main role as a international advanced maker.