ST Spring-Reset Safety-Protected Single-Stage Bolt Tensioner

The ST spring-reset safety-protected single-stage bolt tensioner combines reliable single-stage hydraulic tensioning performance with an integrated spring reset mechanism and dedicated stroke protection device, providing a higher level of operational safety and cycle efficiency compared to gravity-reset alternatives. The spring reset actively returns the hydraulic cylinder to its starting position immediately upon pressure release, enabling faster and more consistent cycle times in high-volume tensioning operations on production lines, scheduled maintenance programs, and time-critical site work.

The integrated stroke protection device monitors and limits cylinder travel to prevent over-extension, protecting both the tensioner and the connected bolt assembly from mechanical damage caused by operator error or unexpected pressure fluctuations. The lightweight design and compact construction make the ST easy to deploy in confined joint locations, while the professional corrosion-resistant surface treatment ensures durability in outdoor and chemically challenging environments.

As with the GT, the interchangeable tensioning nut system provides broad thread size compatibility from a single tensioner body, offering cost-effective coverage across different bolt standards. Multiple ST tensioners can be connected and operated simultaneously from a common hydraulic supply, supporting full-circle synchronous tensioning on flanges, pressure vessels, and structural connections where consistent pre-load distribution is essential. Suitable for wind power, oil and gas, power generation, and heavy industrial maintenance applications.