It is precision locknuts. The degree of precision of the thread is 4H instead of 6H of KM type.

These precision nuts are fastened on the shaft thanks to three fixing screws pressed against the shaft itself. Up to the size 15 they show two plain faces for the clamping through adjustable wrenches. The three screws permit to compensate the lack of precision of the elements to be fastened and to exactly position the nut perpendicularly with the shaft axel.

They are precision locknuts similar to KMT type with a reduced outside diameter. They too are locked on the shaft by three screws, have a cylindrical outer surface and are useful when there is not enough space. The holes on the surface are used for tightening by hook wrenches while for frontal holes by adaptors.

Precision nuts are fastened on the shaft through 3 fixing screws

It is precision locknuts. The degree of precision of the thread is 4H instead of 6H of KM type.

It is precision locknuts. The degree of precision of the thread is 4H instead of 6H of KM type.

It is precision locknuts. The degree of precision of the thread is 4H instead of 6H of KM type.