German-technology sealing system supplier dedicated to the R&D and production of excavator and hydraulic breaker oil seals.
TOSC is a professional sealing system supplier dedicated to the research, design and production of excavator oil seals, hydraulic breaker oil seals and seals for other construction machinery.
Adopting German technology in R&D and production engineering, TOSC has developed high-resilience, wear-resistant polyurethane oil seals and high tear-resistance step seals based on PPDI / PUAR materials — matching the diverse sealing needs of construction and mining equipment worldwide.
Today TOSC supplies seal kits to most leading breaker brands and serves customers across 40+ countries with reliable, OEM-matched solutions.
We specialize in the design and production of polyurethane oil seals and supply new and replacement seal kits to world-known hydraulic breaker brands such as Soosan, Furukawa, Atlas Copco, Krupp, Daemo, Doosan, Toku and Montabert.
Seal kits matched to most leading breaker brands, occupying a leading share in the breaker seal kit market.
Model-matched quoting and technical support within 24 hours, serving distributors and service networks globally.
Individual sealing components and made-to-sample production for special models and applications.
With the tenet "Quality Builds Brand, Sealing Makes the Future", TOSC persists in producing good-quality products and achieving the best development for every team member.
German-trained engineers developing PPDI and PUAR compounds for extreme duty cycles.
High-tolerance tooling and automated lines delivering micron-level consistency.
Every batch verified through fatigue, pressure and dimensional tests with full traceability.
Committed to R&D and production of construction-machinery oil seals.
Introduced German engineering standards into material and tooling development.
Self-developed premium polyurethane verified across major breaker brands.
Recognized by the provincial government for product quality.
Seal kits exported to 40+ countries, serving distributors and OEM service networks.
From precision molding to full-process testing, every step follows German industrial standards.
Every batch verified through dimensional, pressure and fatigue bench tests with full traceability.
Comprehensive models, lean inventory and fast global distribution response.
Distributor and OEM cooperation inquiries are welcome worldwide.