Norbar - Hydranut Hydraulic Nuts & Tensioners
 

Hydranut_logo.gif (3370 bytes)The HYDRANUT - A precision engineered, high pressure, high performance, hydraulically operated bolt tensioning device that can be quickly and easily fitted and used with standard pumping equipment (eg. 10,000 psi pump).

It is manufactured in a choice of steel or stainless steel of tensile strength to suit the required application.

  • Reducing maintenance down time - fast to fit and remove.
  • Gives reliable and precise tensioning.
  • Very suitable for confined spaces or difficult locations.
  • Requires little physical effort.
  • Withstands hostile environments.

HYDRANUT has built a reputation of high quality, and it is this pedigree that is behind our new high quality products:
     HYDRASURE   Clamping nuts
     HYDRAJAC      Stud tensioners
     POLYCELL       Fasteners

HydraNut1.gif (62396 bytes)
HYDRANUT Gyrotory Crusher

 

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HydraNut2.gif (24159 bytes)

HYDRANUT COMPONENTS

1. Nut body which screws onto the bolt thread.
2. Screw thread in bore of nut body, made to suit individual bolts.
3. Piston with outside buttressed screw thread to accept locking ring.
4. Lockring to retain the load when hydraulic pressure is released.
5. High pressure seals.
6. Grub screw and ball valve for pressure release.
7. High pressure inlet with nipple connection.
8. Holes for insertion of 'C' spanner to nip tight nut body and locking ring.
9. Spherical washer designed to self correct seating and bolt misalignments.

HYDRANUT OPERATION

The HYDRANUT assembly is hand screwed onto the bolt until the base is tight against the working face.  It is then nipped tighter with 'C' wrench.

Hydraulic pressure is then applied by a pressure gum, through the nipple fitting on top of the nut body into the sealed chamber, forcing the piston and the nut body apart thus stretching and tensioning the bolt through the joint.

The threaded lockring, mounted on the piston, is then screwed back and hand tightened to retain the induced load tension in the bolt. The pressure is then simply released and the pressure gun removed from the nipple fitting, to complete the operation.

To remove the HYDRANUT, pressure is reapplied through the nipple fitting to unload the lockring. The internal pressure is then relieved and the HYDRANUT can be removed easily.

No major physical force, large wrenches or torque spanners are required to correctly fit and remove the HYDRANUT.


Australian and International Patents Pending
    Australian Patent No. 25403/88
    USA Patent No. 07/478009
    International PCT/AU88/00381

 

 
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Sales Office: 134 Pine Creek Circuit, St Clair NSW 2759 Sydney (Aust)
Warehouse: Unit 3008 / 2 Zeleny Rd Minchinbury NSW Sydney (Aust)

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