スミハツ List of Products and Services

At Sumihatsu Co., Ltd., we handle "taper leaf springs." We are capable of processing ultra-thick taper leaves. Additionally, through high hardening and enhanced stress peening, we aim to improve fatigue strength. By reducing the weight of the laminated leaf springs, we can achieve cost reductions, and the decrease in the number of leaves allows for a reduction in inter-leaf friction. 【Features】 ■ Using a pull-forming type rolling mill, we can achieve uniform stress or constant deflection rolling. ■ We can accommodate plate thicknesses of up to 50mm. ■ High hardening and enhanced stress peening improve fatigue strength. *For more details, please refer to the PDF materials or feel free to contact us.

• Other machine elements

At Sumihatsu Co., Ltd., we handle "non-linear characteristic springs." We perform taper processing of materials using NC lathes to achieve high precision dimensions. Furthermore, we shape them with NC coiling machines and conduct constrained heat treatment (press tempering) to minimize variations in spring characteristic changes. Please utilize this when you want the spring characteristics to follow the displacement of the load. 【Features】 ■ Achieves high precision dimensions ■ As load is applied to the spring, the effective number of coils that act as a spring changes, resulting in non-linear characteristics. *For more details, please refer to the PDF materials or feel free to contact us.

• Spring

Sumihatsu Co., Ltd. is a company that manufactures and sells automotive leaf springs, industrial coil springs, railway facility products, and more. Our product lineup includes "joint grid sleepers," which distribute loads and suppress displacement through a high-rigidity ladder structure; "improved diagonal adhesive insulated rails," which have been enhanced for longer lifespan; and "level keepers," which are installed in areas prone to floating sleepers to suppress localized track displacement. 【Product Lineup】 - Joint grid sleepers - Improved diagonal adhesive insulated rails - Level keepers - Bolt-type anti-creepers - Composite sleepers, etc. For more details, please contact us or download the catalog.

• Other machine elements