ePrivacy and GPDR Cookie Consent by Cookie Consent
  • Examples

    Example 1: Tool fixture

    Typical arrangement of the clamping nut on a tool fixture.

    Example 2: Work piece fixture

    The machine component must be reliably clamped here during the operational status, but must permit traversing for periodic set-up work. The clamping nut with thread fixation used here offers the advantage that its position remains fixed even when the nut is released.

    Example 3: Gear fixture

    Realised using a clamping set, tensioned by a clamping nut. The gear has to be changed or its peripheral position altered periodically. This can be conveniently and safely achieved using the clamping nut.

  • Benefits
    • During the clamping process (tightening the clamping screw), no movement takes place at the end face and at the main thread of the clamping nut. This precludes the possibility of friction loss, thus eliminating the cause of the poor efficiency of conventional nuts.
    • Only the clamping screw with its relatively small movement thread and the ball-bearing supports make some sliding movements. This results in high system efficiency. Combined with the double clamping force ratio, this enables reliable and user-friendly application of the clamping force.
    • The entirely mechanical structure of the clamping nut guarantees long durability and makes it virtually impervious to the influence of temperature.
  • Function

    Functional Principle

    The principle is shown in a simplified diagram with enlarged clamping path.

    Clamping nut screwed into place, light contact with end face is sufficient.

    Clamping screw actuated: High axial forces have built up at the point of end face contact.

    Clamping screw released: Original, light endface contact is restored.

  • Fields of Application

    Series AM-GS clamping nuts are mechanical force-transmitting elements for use in general mechanical and construction engineering. They are of particular benefit for the execution of reliable connections involving high axial forces with a low level of manual force.

    They are designed to permit clamping and release in quick succession without difficulty. The clamping nut is suitable for use on rotating spindles.

    Series AM-GS

    • High degree of efficiency, minimal tightening torque.
    • Simple actuation.
    • Can be used on rotating spindles.
    • Capable of withstanding dynamic loads.
    • High degree of axial pretension safely achievable.
    • Designed with purely mechanical components.
    • No hydraulics used, which means no leaks or sudden failures are possible.
    • Excellent durability.
  • Assembly

    Ensure that the clamping screw is in the correct starting position. Under no circumstances may the clamping screw be screwed in below the surface of the housing before the clamping sequence begins. Otherwise it is not possible to utilise the full clamping path of 2 mm.


    1. Screw the clamping nut manually until it makes contact with the end face (Fig. 1), Tighten the fixing screws and lock the clamping nut to the thread.
    2. Tighten the clamping screw, observing the max. tightening torque. If a torque wrench is not available, the clamping screw may also be tightened using a screwdriver ISO 2936 (DIN 911) using normal manual force. If the clamping screw is tightened without a torque wrench, there is a tendency for the clamping force of the clamping nuts larger than M42 not to be fully utilised.

    The clamping force of the nut is now fully effective. (Fig. 2)


    1. Turn the clamping screw back to the starting position. The clamped component is now released.
    2. If the clamping nut is to be completely removed from the spindle, the thread lock screws must now be released. Then unscrew the clamping nut manually.

    In exceptional circumstances, for example due to heavy soiling, it may be difficult to unscrew the clamping nut. In this case, utilize the radial boreholes around the outside diameter to insert a guide pin.

    Fig. 1

    Fig. 2

Order No.
clicca per richiesta
Diameter in mm Effective clamping force Clamping screw Lockscrew
d1 d2 d3 d4 h1 h2 F Width accross flats SW1 MA Width accross flats SW2 M5
ISO-5H h11 kN mm Nm mm Nm
M20x1,5 22 52 6.9 56 26 30 6 20 5 8
M24x1,5 27 55 6.9 56 26 30 6 20 5 8
M30x1,5 32 69 9.2 78 31 50 8 35 6 15
M36x2 40 78 9.2 82 31 50 8 35 6 15
M42x2 50 88 11.5 88 36 75 10 55 6 15
M52x2 60 100 11.5 92 36 75 10 55 6 15
M60x3 70 118 14 102 40 85 12 70 8 20
M68x3 80 130 16.2 112 46 100 14 80 10 30
M80x4 100 152 16.2 122 46 100 14 80 10 30

No product found or do you have a special application? We would also be happy to advise you on specialized solutions, which we can custom produce to meet your needs as your development partner. Simply get in contact with us - we’re looking forward to hearing about your project.

All information is supplied without liability and subject to technical changes. Please observe the operating instructions.

Siamo qui per aiutarvi | Il nostro team è in attesa del vostro compito. Contattateci. Realizziamo la soluzione giusta per le tue esigenze.

Phone +39 02 4070 7894

Product finder | Trova il prodotto giusto per la tua applicazione in modo rapido e sicuro.


Prodotti | Perfetti per le vostre esigenze: Spieth Elementi per macchine. Innovativa tecnologia di connessione per maggiore produttività grazie alla precisione ...


Applicazioni | In tutto il mondo in molti settori le soluzioni proposte da Spieth offrono risultati sicuri ...


Vantaggi | Maggiori prestazioni, maggiori capacità, più successo con Spieth ...

Il principio

Il principio| Accoppiamento meccanico a 360°: efficiente, di alta precisione, sicuro. Una connessione che fa muovere le cose ...

Partner di sviluppo

Partner di sviluppo | Ingegneria su misura. Soluzioni di precisione, per fare un passo avanti ...

Cerca prodotto

Cerca prodotto | Per trovare rapidamente e in modo sicuro il prodotto giusto per la vostra applicazione ...