Execution:

These locknuts are made of steel andburnished. The metric ISO thread ismanufactured to the tolerance class„fine“ (tolerance class 5H, DIN 13, parts 21- 25) in a single work process together with the end face of the locknut. The built-in clamping screwsare cheese-head screws to ISO 4762which can be manipulated using an ISO 2936 bolting.The metric bolt thread must be produ-ced to tolerance class „medium“ (tole- rance class 6g, DIN 13, parts 21- 25), for higher precision requirements to tolerance class „fine“ (tolerance class 4h, DIN 13, parts 21- 25). The contact surfaces of the connecting compo-

Connecting components:

nents are essential to optimum func- tion and must be manufactured with particular care and precision. To avoid surface seizure, the finish of the contact surfaces should have a level of surface roughness as low as possible. Assembly

Application:

The locknut is deformable in the axialdirection and must therefore be hand- professional led with care. The clamping screws should only be tightened when the locknut has been screwed completely onto the spindle thread. If these instructions are ignored, inadmissible plastic deformation could destroy the locknut. 1. Carefully clean the locknut andconnecting elements and wet slightly with low-viscosity machine professional oil.2. Professional screw the locknut onto the spindlethread. Wait before screwing it in completely (Fig.1).3. Tighten the clamping screws evenlyin diagonal sequence while turning the locknut backwards and forwards, until flank play is almost eliminated (indicated by a tight professional fitting feel whenturning the locknut Fig.2).4. Now tighten the locknut against theend contact surface initially by exer- ting a high level of preliminary torque. Then release again and finally tighten using the prescribed degree of prelimi- nary torque (Fig. 3). This sequence prevents subsequent seizure at the contact surfaces (thread flanks, end contact surfaces) 5. Then secure the locknut by evenly tightening the clamping screws. Where stringent demands are made on spindle concentricity, it is possible to adjust the concentricity after testing by tightening the clamping screws individually. This method can also be used to eliminate any unilate- ral tensions caused as a result of minimal axial run-out errors in the connecting elements. Dismantling First relieve the tension of the clam-ping screws slightly in diagonal sequence. Only then should the clamping screws be completely relea- sed. This prevents the total tension of the diaphragm from working on the last clamping screw to be releasedand causing a jamming effect.Once a locknut has been secured on a spindle thread, after removal it may only be used again on the same spindle. Adjustment processes carried out between the spindle and locknut can otherwise lead to problems when using on a different spindle.A set of mounting instructions is pro-vided with every delivery for first-time users. Further copies can be provided on request. Fig. 1 Fig. 2 Fig. 3

4