AquaMax® Subsea Tensioner

Made to fit where other tools can't, Hydratight's AquaMax® Subsea Tensioner is a new tool specifically designed to tension Compact flanges as well as all standard ANSI, API and MSS types.

Bolt Range:

M20 - M100, ¾" - 4"

Maximum Load Capacity:

134 - 4643 kN


30 mm


AquaMax® is the only tool on the market that can offer such a high load capacity on such a wide variety of applications - up to 30% more than traditional tensioners.

Comprising 19 bolt diameter specific tools, with eight tools forming the core range, The AquaMax® series features industry leading Quick Fastening Nut technology, guaranteed to save time and increase efficiency.

Primarily for use on subsea applications, each tool within the core range covers 100% of the standard flanges that utilise the bolt diameter it was designed for and approximately 80% of flanges that utilize the next size down.

Plus, you'll find all of the user-friendly features and service operations of the AquaMax® range, providing a comprehensive solution to meet your load generation needs.

Features and Benefits:

  • Fits all standard flanges including ANSI, API, Taperlok and Compact: reducing your need for kit and total tool inventory costs.
  • Generates up to 50% more load than traditional tensioners with a maximum working pressure of 1500 bar (21,750 psi).
  • Quick fastening reaction nut: allows rapid tool application and removal regardless of bolt length, corrosion or thread damage.
  • Unique floating piston design: tilts in any direction without loss of load, eliminating piston seizure and aiding tool retraction.
  • Large stroke capability with overstroke elimination: with 1 3⁄16" of stroke capability, tools are safe and easy to use.


Accurate tension of bolted connections requires knowledge and experience. Our products have patented solutions that combine both speed and accuracy.


Quality is our trademark, and the proof is in our satisfied customers. kNm Hydraulics holds its subcontractors and their products to a high standard. We manufacture our equipment in the USA, UK, Sweden, and Germany.