We supply two types of rings, the frontal rings and spring bushes.
HTS rings and spring bushes are made of tool steel or copper, depending on the application.
There are different plunger ring and spring bushing models made to fit different iTherm®, ABS, ATS and ARP plungers.
Made of hot work tool steel or copper, the plunger ring is softer than the inner side of the sleeve and has been specially developed to enhance contact and sealing.
During injection, the ring opens due to the penetration of aluminium between the plunger body and ring and its own elasticity
Made with soft steel which is softer than the inner wall of the sleeve, the spring bush (also referred to as the back ring), has been specially designed for vacuum applications.
Due to its own elasticity during injection, the spring bush opens and ensures a vacuum.
Extended plunger and sleeve lifetime
Plunger rings have a lower hardness than tips or sleeves.
Compared to harder “scraper” rings produced by our competitors, HTS Plunger rings extend the lifetime of both, pistons and sleeves.
Diameter 40 - 230 mm
Plunger rings are made using tool steel produced in EU, or cooper.
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