Precision Locknut MSR/MSA
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Series MSR MSA Works Standard SN 04.02SN 04.04 >

SPIETH locknut series MSRSPIETH locknut series MSA > MSR and MSA series locknuts areprecision nuts whose system-specific benefits can be used in every mecha- nical engineering sector. Where fast- spinning and/or dynamic stressed spindles are used, the precision of the locknuts, their axial rigidity and high level of dynamic safety ensure opti- mum results for the entire bearingThe locknut is designed rotationallysymmetric without any imbalancing properties such as grooves, slots etc. The clamping screws distributed evenly around the centre (in a circle) together with the ideally configured...

These locknuts are made of steel andburnished. The metric ISO thread ismanufactured to the tolerance classfineē (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 screwdriver.The metric bolt thread must be produ-ced to tolerance class mediumē (tole- rance class 6g, DIN 13, parts 21- 25), for higher precision requirements to tolerance class fineē (tolerance class 4h, DIN 13, parts 21- 25). The contact surfaces of the connecting...

Cheese-head screws with a hexagon socket in compliance with ISO 4762 strength class 12.9. = 0.14. As the effective friction coefficientsdepend on a range of factors which are often beyond the control of the manufacturer, values specified here are without com- mitment and are made in the form of recommendations. M > A : Tightening torque per clampingscrew. The tightening torque is based on a friction coefficient The axial pretension of a screw con-nection often plays a decisive role for successful function, and must there- fore be set with particular accuracy. However, in most assembly...

Fig. 4:In tapered roller bearings, minimal axial run-out and a high level of axial rigidity and dynamic safety form amajor contribution to perfect bearing operation: Radial stress applied to the taperedroller bearing generates axial forces (axial rigidity). Due to a lack of axial pretension (not allowed on taper roller bearings), the intrinsic safety of the locknut is extremely important (realized without any friction at the end face). Fig. 5:Locknut used as an adjustable lay-on surface for a machine superstructure. During assembly, the back-lash free nut enables precise adjustment of the...

Fig. 6:Main spindle bearing in a lathe: The locknut ensures a high level of axial rigidity and good concentricity. Fig. 7:The bearing of the ball roller spindle receives a high degree of axial rigidity while assembling by using a locknut. Under high dynamic operating conditions, the dynamic safety of the locknut represents a particular advantage. 10 >

Fig. 8: End plate of column framework. The precisely right-angled lay-on surface of the locknut guarantees even subjec- tion of the bolt thread to strain (devoid of flexural torque). This is of particular importance in situations involving dynamic stress. Fig. 9: The pretension of the spring on a friction clutch is precisely and conti- nuously variable adjusted here by using a locknut. The reliable locking function is of particular importance here. 11 >