Do you really know about high precision lock nut?

Industrial lock nut with lock washers are not considered to be suitable for super-precision bearing applications because of the relatively wide manufacturing tolerances of the thread and abutment surfaces. As a result, our factory had developed a full line of precision lock nut that are manufactured within very tight tolerances. These simple to mount devices, which locate bearings and other components accurately and efficiently on a shaft, meet the requirements of machine tool applications, both technically and economically.

All precision lock nut use friction between the mating thread flanks of the spindle shaft and lock nut to hold them in place. To apply this friction, we manufacture precision lock nuts in the following design:

KMT and KMTA lock nut with locking pins

KMT and KMTA lock nuts are intended for applications where high precision, simple assembly and reliable locking are required. The three, equally-spaced locking pins enable these lock nuts to be accurately positioned at right angles to the shaft. However, they can also be adjusted to compensate for slight angular deviations of adjacent components.

KMT and KMTA lock nuts should not be used on shafts with keyways in the thread or adapter sleeves. Damage to the locking pins can result if they align with either.

KMT lock nut

are available for thread M 10x0,75 to M 200x3 (sizes 0 to 40) and Tr 220x4 to Tr 420x5 (sizes 44 to 84)

KMTA lock nut

are available for thread M 25x1,5 to M 200x3 (sizes 5 to 40)

have a cylindrical outside surface and, for some sizes, a different thread pitch than KMT lock nuts 

are intended primarily for applications where space is limited and the cylindrical outside surface can be used as an element of a gap-type seal

Features and benefits

Maximum axial run-out between locating face and thread (up to size 40): 0,005 mm

Adjustable to compensate for slight angular deviations 

Fine thread pitch

Withstands high axial loads

Reliable, effective locking mechanism

Simple installation and removal

No keyway required

Reusable

Designed for frequent installation and removal

The locking principle

KMT and KMTA series precision lock nut have three locking pins equally spaced around their circumference that can be tightened with set screws to lock the nut onto the shaft. The end face of each pin is machined to match the shaft thread. The holes for the locking pins and set screws are drilled with their axis parallel to the loaded flank of the shaft thread . The locking screws, when tightened to the recommended torque, provide sufficient friction between the ends of the pins and the unloaded thread flanks to prevent the nut from loosening under normal operating conditions . Because the locking pins are tightened against the unloaded flank of the shaft thread, they are not subjected to any application loads imposed on the nut.

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Contact: Grace
Email: ntn@llhbearing.com
Skype:+8618668903871
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