Leaf Spring Used for Trucks and Buses:
Top Share in the Domestic Market

Including suspensions that absorb vibrations transmitted from the road to reduce their impact on drivers, passengers, and cargo, many domestic truck manufacturers use leaf springs manufactured by us at Sumihatsu.

Heavy leaf springs (bearing springs)
that support the horsepower of steam locomotives

The restoration of steam locomotives is ongoing in various places due to regional revitalization projects and the like. Since available detailed drawings at the time of steam locomotives are few, we design and manufacture them by checking the actual article and meeting with the customer.

Involved in tuning leaf springs for rally cars in addition to commercial pickup trucks

In order to meet the demands of our rally team customers, we strive for leaf springs that are stronger and lighter. We take care of everything from design right through to manufacturing, while constantly improving our skills to help them secure first place on the podium.

Three Hidden Springs
that Support Elevators

Fastening leaf springs, for which rail technology is applied, are used for the guide rails that stabilize the movement of elevators. In addition, the U-spring is used as a speed control / stop device in the event of an emergency, and the coil springs installed in the bottom layer play the role of cushions.

Contribute to Labor-saving and Automation in Manufacturing Industry through Arms of Industrial Robots

Automation is advancing in manufacturing plants of a whole host of industries. Springs that assist the torque load of the motor are essential for producing the quick and precise movements of industrial robots.

Coil Springs Improve the Riding Comfort of Railway Vehicles from Regular Trains to Shinkansen Bullet Trains

By virtue of the action of springs which support the bottoms of vehicles, you can use trains for daily commuting and/or shorten travel times by traveling at high speeds.

Our Springs are also
Used on Japanese Rockets

We were involved in a space project that unites the latest Japanese technologies. Our repeated trial and error efforts made it possible to manufacture springs that function accurately in a harsh environment, which is different from that of earth, as well to comply with the weight standards.

Manufacturing a Broad Range of Products from New Parts to Replacement Parts

We manufacture parts that make up rail tracks, such as resin sleepers and devices that suppress the vertical movement of rails. The device that fastens the sleepers and rails is made of springs to withstand vibrations.

Balancer that Keeps the Tension
Constant so that the Railway Wires do not Droop Down

The tension of the railway wires, which come into contact with the train’s pantograph, changes depending on the temperature. The spring-type balancer absorbs the expansion and contraction of wires, automatically adjusts the tension to a constant value, and is maintenance-free.