Precision locknuts

Precision locknuts, belonging to the series KMT and KMTA, allow to lock bearings axially on the shaft, in a simple and effective way.

These types of locknuts have three brass grains arranged equally spaced around the circumference.
The grains are pressed against the shaft by internal hexagon pressure screws and prevent the locknut from turning.

Assembly and registration are easy, and are not required lock washers or grooves on the shaft.

Set and pressure screws are placed with the same inclination, with respect to the shaft axis and of the thread side. One of the far end of screws is machined simultaneously to the thread of the locknut and therefore it is also threaded.
Locknuts are locked in place thanks to the friction between the screws and the shaft thread.

The grains do not receive the axial loads acting on the locknut. When the locknut is locked, the flanks of the thread are not discharged axially and the locknut does not deform.

Locknuts belonging to these series are adjustable.

The three locking screws allow to position in an accurate way the locknuts perpendicularly to the shaft or they can be used to compensate some inaccuracies or deviations of other details that need to be locked on the shaft.

Locking screws are not deformed and always retain their high precision, independently of the number of assembly and disassembly which they are subjected.

KMT locknuts differ from that of KMTA series for external form and in some cases to the thread pitch.



We offer customized and certified products.

Precision locknuts KMT have notches. 
The smaller also have two opposite flat surfaces for use of wretches.

They are suitable for applications that require a simple mounting and reliable locking of high-precision.

KMTA precision locknuts differ from the KMT series in external shape, and in part, have a different pitch.
They offer the same advantages of KMT series.

They have a smooth and uniform cylindrical outer surface, their use is expected when the space turns out to be limited.

Thanks to their construction form, locknuts can be used as components of the non-contact type protections.
Holes along the circumference facilitate the mounting.

KMT and KMTA precision locknuts are made of high strength steel; surfaces are phosphated and oiled.
For locking screws it is used raw brass.

The assembling of the  precision locknuts KMT is very simple. Along the circumference there are equidistant notches.

Wrenches of different types can be used to tighten them, depending on the application and the size of the locknut, including sector wrenches with square lugs or impact wrenches.

Precision locknuts KMTA can be tightened using sector wrenches with round stud which engage in the holes on the circumference.

To close the KMT and KMTA precision locknuts must first tighten the set screws, in such a way that the thread end of screws does not go to engage the shaft thread. Then the screws themselves are tightened alternately and uniformly.

When locknuts KMT and KMTA have to be disassembly, screws still engage the shaft thread, even after the pressure screws have been loosened.

Light blows applied with a rubber mallet to locknut (in proximity of pressure screw) will be useful to loosen the screws. Then, locknuts will be easily disassembly from the shaft.

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