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Foundation Tensioners

Foundation Bolt Tensioners

Hydraulic tensioning is the ideal method for tightening bolted connections. Hydraulic tensioning eliminates inaccuracies and helps achieve correct bolt loading in critical connections. At HTI, we’ve been building hydraulic tensioners and nuts since 1986.

What are Foundation Hydraulic Tensioners?

HTI's foundation bolt tensioners are designed for the unique constraints of foundation studs for applications such as wind turbine foundations. We can provide tensioning solutions for just about any foundation stud application.

HTI single-stage foundation tensioners provide an economical solution where radial constraints are minimal.

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Wind Turbine single stage through-hole foundation tensioner with spring return

Wind Turbine single stage through-hole foundation tensioner with spring return

Multi Stage Foundation Tensioners

HTI multi-stage foundation tensioners provide a radially compact solution where radial constraints exist, such as a close-in neighboring stud distance.

Multi-stage function stud tensioner

Multi-stage function stud tensioner

Elliptical Foundation Tensioners

Elliptical foundation tensioners provide a compact solution where constraints between the stud and wind turbine mast exist.

Elliptical foundation stud tensioner

Elliptical foundation stud tensioner

Features of Foundation Tensioners 

HTI's foundation hydraulic tensioners include a wide range of features and advantages, such as:

  • Trouble-free, No–Leak, Ultra-Reliable, Lo–Friction Seals
  • Overstroke Indicator – fail-safe design if accidentally over-extended
  • Extremely-Long Working Stroke (1.0 inch/25mm)
  • Compact and Lightweight Design
  • Twin Hydraulic Ports – for tool chaining
  • Spring return option for quick tool reset time to next fasten
  • Can have a threaded puller or be a through-hole to use with a separate reaction nut

HTI also provides foundation stud testing load cells.

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Custom Engineered Tensioners Since 1986

HTI has been designing engineered solutions to your toughest bolt tensioning problems since 1986! You can choose from one of our standard catalog sizes above, or we can design a custom fixed tensioner for any application when a standard model won’t work. HTI tensioners can be designed for imperial or metric-sized studs, high loads, high temperatures, large stud sizes, or corrosive environments. Our multi-unit tensioning systems can make easy work of large bolted systems, and our automated tensioning systems can reduce labor and increase throughput in high-volume manufacturing applications. 

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If you have questions, comments, would like more information about our products, or want to get started designing your custom tensioning solution, please contact us and we will respond promptly.