Hydraulic nuts type HM
 
Hydraulic nuts type HM

M24 up to M100 (7/8'' up to 4'')
225 kN up to 2750 kN
Standard and special designs for push-in connections

Hydraulic nut type HM

Hydraulic nut type HM from ITH: standard design

ITH hydraulic nuts can be used as a substitute for conventional hexagon nuts or standard round nuts.

Dimensions and pretensioning forces

  • M24 bis M100 (7/8'' to 4'')
  • 225 kN to 2750 kN
  • Further designs can be delivered according to your needs

Application areas

  • Tightening small amounts of bolt connections
  • Once pretensioned hydraulic nuts remain on the bolted connection. They can easily be loosened - even after a long period of time
  • Especially useful in high-temperature areas
  • Special hydraulic nut designs for applications which are only accessable in an axial direction like push-in bolt connections
 

Hydraulic nut applications, function and technical data

Applications
Design
Function
Technical data
Hydraulic nut low height clearance 
Hydraulic nut M36 (1 3/8'') standard design 
Hydraulic nut special design preassembly 
Hydraulic nut on a push-in connection of a counter weight 
Hydraulic nut low height clearance
Hydraulic nut low height clearance

Even with low height clearances the compact ITH hydraulic nuts, standard design, allow to tighten these bolts safely and precisely. Therefore the hydraulic connector is designed as an elbow.

As this is an high-temperature application the high pressure hoseline is equipped with a fire-resistant tube. Once applied with pressure hydraulic nuts remain tightened (pretensioned) on the bolt.

Hydraulic nut M36 (1 3/8'') standard design
Hydraulic nut M36 (1 3/8'') standard design

These bolts of a horizontal rotation table are tightened with ITH hydraulic nuts M36 (1 3/8''). As this application is radially free a standard design of the hydraulic nut can be used. Herby the lock nut can be turned down with the integrated bore holes by using an adjusting stick (tommy bar).

Hydraulic nut special design preassembly
Hydraulic nut special design preassembly

This hydraulic nut type is a special design for push-in connections like for example on counter weights of construction machines or cranes.

The hydraulic nut is preassembled on the bolt and both can be positioned in the countersink of the push-in connection. With the square socket it is possible to turn the hydraulic nut and the bolt together into the countersink which speeds up the assembly.

Hydraulic nut on a push-in connection of a counter weight
Hydraulic nut on a push-in connection of a counter weight

The bolt connections of the counter weights of this construction machine are designed as push-in connections. They are applied over head into the countersink.

The ITH hydraulic nut was preassembled on the IHF fastener M36 (1 3/8''). Both components together can be run down into the countersink with the square socket.

After applying the hydraulic pressure with the ITH pump MicroMAX the locknut can easily be turned down with the adjusting ring.

 
 
Hydraulic nut low height clearance
Das ITH-Lieferprogramm umfasst sämtliche Werkzeuge. Ziehende und drehende Werk- zeuge, Mutternsprenger, Handwerkzeuge, Drehwinkel-Tools und vieles mehr...
1
Hydraulic nut M36 (1 3/8'') standard design
Das ITH-Lieferprogramm umfasst sämtliche Werkzeuge. Ziehende und drehende Werk- zeuge, Mutternsprenger, Handwerkzeuge, Drehwinkel-Tools und vieles mehr...
2
Hydraulic nut special design preassembly
Das ITH-Lieferprogramm umfasst sämtliche Werkzeuge. Ziehende und drehende Werk- zeuge, Mutternsprenger, Handwerkzeuge, Drehwinkel-Tools und vieles mehr...
3
Hydraulic nut on a push-in connection of a counter weight
Das ITH-Lieferprogramm umfasst sämtliche Werkzeuge. Ziehende und drehende Werk- zeuge, Mutternsprenger, Handwerkzeuge, Drehwinkel-Tools und vieles mehr...
4

Hydraulic nut standard design for radial free applications

Hydraulic nut - standard design

Standard design for bolt connections which are radially free accessible.

  1. Hydraulic pressure connector
    horizontal or vertical
  2. Piston with internal thread
  3. Lock nut
    designed with outer boreholes to counter directly by an adjustment stick.  mit äußeren Radialbohrungen zum direkten Kontern mittels einer Beistellstange.
  4. Cylinder
  5. Adjusting stick

Hydraulic nut design for push-in connections in countersinks

Hydraulic nut for push-in connections
  • Spuare socket (2)
    For push-in connections: The hydraulic nut is preassembled on the bolt and both can be positioned in the countersink of the push-in connection. With the square socket it is possible to turn the hydraulic nut and the bolt together into the countersink. You can find a demonstrative picture among the application examples.
  • Adjusting ring (6)
    Because of the radial limitation in countersinks you can use the adjusting ring to run down the lock nut  from the top.

After assembling the ITH hydraulic nut on the bolt the hydraulic nut gets connected to an ITH high pressure pumps using a high pressure hoseline. With rising hydraulic pressure the the tie of the hydraulic nut pulls the bolt in an axial direction. Thereby the required tensioning force is applied - the bolt connection is tightened.

After reaching the maximum pressure the counter nut can be run down with an adjustment stick or in case of push-in connections with an adjustment ring as an extension for the countersink.

Now the pressure can be released and the ITH hydraulic nut remains on the bolt connection in a pretensioned status. At any time hydraulic nuts can be loosened easily - even after a long period of time and even if used in challanging environments like high-temperature applications.

Hydraulic nut standard design dimensions

Contact us for a free of charge technical consultation, for individual designs of hydraulic nuts or questions regarding your bolt connection .

Hydraulic nut type HM

Hydraulic nut type hm - technical datasheet

Ød3 = Outer diameter, Height h5 = Hight of the cylinder body without hydraulic connector.
Technical modifications or changes are reserved.

Contact and technical consultation in bolting technology

Contact ITH for a free consultation regarding bolting tools, fasteners or service in bolting technology

All information at a glance

Order your product brochure free of charge: As a digital version or printed brochure.

Objective technical advice

Being a whole system supplier we are not determined to one specific bolting method - Therefore we advise you objectively and offer the best technical and cost-effective solution.

Contact us for a free consultation

Contact us on any questions regarding your bolt connection or for any technical questions. We advise you free of charge and offer a free on-site inspection.

 

Hydraulic nuts and relating hydraulic equipment