Materials, Coatings, and Finishes
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.
We offer a variety of materials, coatings, and surface finishes on our tensioners and hydraulic nuts.
HTI’s standard materials for hydraulic tensioners and nuts is 4140 heat-treated alloy steel.
The following additional material options are available:
- 17-4 stainless steel for corrosive environments
- Nitronic 60 stainless steel when a non-magnetic material is required
- Vascomax stainless steel for high strength and hardness requirements
- Titanium and for applications requiring very lightweight
The standard coating for hydraulic tensioners and nuts is hot black oxide (on 4140 alloy steel).
The following additional coating options are available:
- Xylan coating for corrosion resistance and low friction
- Anodizing on aluminum products
- Nitriding on 17-4 stainless steel for surface hardness and galling resistance
- Hot dip galvanizing
- Black phosphate for corrosion resistance
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. Our engineers are happy to consult with you to help choose the right finish for your hydraulic nuts.