Quicker
Multiple hydraulic nuts offer a quick and accurate method of tightening bolted joints including larger diameters.
Safer
Includes mechanisms to remove the hazard of over-stroking the hydraulic rams.
Smarter
Bolt load is applied axially to the bolt. Inconsistencies such as friction, bending and lubricant are not a factor when using Hydraulic Nuts.
How do Hydraulic Nuts work?
Hydraulic pressure is applied simultaneously to each Atlas Copco Nut. All
frictional factors connected with conventional bolt tightening methods
are alleviated since Atlas Copco Nuts apply a direct axial force to the bolt
which generates a bolt elongation. This elongation/tension is permanently retained by means of the load retaining collar. Atlas Copco Nuts have
been designed to be as compact as possible, in order to allow adjacent
fitment on as many applications as possible. In most cases they are
designed to produce a residual bolt stress of 45000 lbs/In2 (310N/mm2)
which is more than adequate for most bolted joint applications.
As pressure is applied to the Atlas Copco Nuts not only does the bolt elongate but also joint compression occurs. Since many applications incorporate some form of gasket, this joint compression can be substantial, in order to withstand this joint compression all Atlas Copco Nuts are capable of considerable piston movement. This allows the Atlas Copco Nuts, in most cases, the ability to tension a complete joint in only one pressurisation sequence, which can result in extremely high time savings.
Bottom Collar
- Applies direct axial force to the bolt generating a bolt elongation, the tension is permanently retained by the load retaining collar.
- Designed to be as compact as possible in order to allow adjacent fitment on as many applications as possible .
- High pressure seal technology, offering 1000’s of safe pressure cycles.
Top Collar
- The Top Collar derivative is ideally used where the nut is sunk into a pocket or spot face.
- The load retaining collar is situated at the top of the hydraulic nut allowing for easy access by the user.
- High pressure seal technology, offering 1000’s of safe pressure cycles.
Technical Specifications
Bottom Collar
Top Collar
