The principle is ilustraded in a simplified diagram with enlarged thread flank play.
Screwing on the locknut
As with every threadead connection, there is a degree of mating play when the nuts are screwed on. As a result, the nut may be aligned with a prarallel and/or angled axial offset relative to the spindle axis; in other words, the contact surface of the nut maybe at an incline.
Self-centering and self-aligning thanks to play restriciton
Unique: Spieth locknuts are automatically self-centring and eliminate mating play (thread flank play) as far as possible. Thanks to play restriction, the locknut centres itself and the conctact surface of the engages at right angles to the spindle axis.
Tightening and locking
The locknut is tightened with the required level of preliminary torque. The lock screws are then locked with the specified level of locking torque. This ensures optimum contact at the thread flanks and maximum concentricity.
Higher levels of operational safety
Spieth benefit: The previously set locking forces are not cancelled by the working load, but are superimposed and therefore reinforced. Put simply: the forces act in the same direction and are therefore added to each other. The optimum solution that delivers improved safety.
