Hydraulic lock nut

Used when strong torque is required mainly in confined operating spaces or for frequent disassemblies and assemblies.
• Replacing the traditional mechanical rings and nuts because they guarantee higher and controlled bolting values, they are built based on the dimensions and force values requested by the user.
• They are used in the nautical, steel-making and mechanical sectors.

http://www.mvbbearing.com/Products/84.html

Features:

• For all heavy duty applications
• Hard-chrome plated piston rod
• Interchangeable hardened saddle
• Manufactured from high strength alloy steel
• Capacity: 220 ton - 1100 ton ;
• Stroke: 50 mm - 150 mm;
• Working Pressure 700 Bar (10000 PSI)

http://www.indiamart.com/aceengineeringservices/industrial-products.html

Schrem hydraulic lock nuts

- Trustfull and stable clamping of tools and workpieces
- For arbors from D12 to D120mm
- Service for broken nuts also available

http://www.jrtools.fi/tehotools/?page_id=51