Aquajack® Subsea Tensioner

Hydratight’s Aquajack® subsea tensioners allow divers to perform the tensioning process with tools designed specifically for their unique requirements.

Aquajack® tensioners feature a compact design and long piston stroke. The unique Split Nut® design of these tools allows rapid application to long bolts and damaged threads, and rapid tool removal.
Bolt Range:

M16 - M90, ¾" - 3 ½"

Maximum Load Capacity:

72,4 - 2316 kN


30 mm

By tightening all the bolts on a joint simultaneously a saving of up to 80% can be achieved over alternative methods.

Hydratight's Aquajack® subsea tensioner achieves this to provide the most cost effective solution to subsea bolt or stud tightening.
  • 30mm maximum piston stroke for tools AJ2 to AJ8
  • 20mm maximum for tools AJ0 and AJ1
  • All tools incorporate visible piston stroke indicators

Features and Benefits:

  • Compact design
  • Long piston stroke
  • Misalignment compensation
  • Quick, simple hose connection
  • Visible piston stroke indication
  • 'No spill' overstroke elimination
  • Quick fastening or solid reaction nut


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.