Servomech ball screw nuts are manufactured in-
a) Radial Liner where the balls travel for 1 revolution and are then deflected back to the start point by an insert called a liner. There are typically 3 or 4 tracks of balls inside the nut.
b) Frontal deflector where a single track takes the balls through several revolutions down the length of the nut. A deflector then diverts the balls into a return tube machined in the nut body. They pass axially back up the length of the nut and a second deflector returns then to the start position.
Frontal deflector nuts have slightly higher load capacity and they are better suited to large thread pitches and multi-
Single nut with flange to DIN69051
This is recognisable by the two flats on the flange.
Two versions are offered, for rolled screws of diameter 16 to 40mm and for whirled screws from 20 to 100mm. Dimensions are the same. The whirled version has slightly higher load capacity.
Single preloaded nut with flange to DIN69051
The preload removes backlash and is normal practice when the screw is of whirled quality. Two sets of ball tracks are machined with an offset of a few microns in the pitch Dimensions are the same as the standard single nut but load capacity is lower.
Diameters are 20 to 63mm
Double preload nut with flange to DIN69051
The double nut removes backlash in a similar way to the single preloaded nut, but the extra length restores the load capacity
Screw diameters 20 to 100mm
A new machining centre creates the nuts in a single process. The nuts are then hardened followed by skimming of the critical dimensions by a special machine tool that achieves micron accuracy. Hand assembly with different ball options achieves smooth running and zero backlash.
Oil lubrication is recommended for maximum performance, particularly high speeds, and lifetime. However many applications make use of grease lubrication where the ball nut is pre-
Manufactured in steel 18NiCrMo5 with hardness 58-
Pitches 5 to 40mm
Suits Linear speeds up to 2m/s Ambient temperatures -
Oil or grease lubrication
Special dimensions possible
We aim to make the selection and ordering process as easy as possible. From your application data we make a preliminary assessment before referring it to the factory.
A visit to your site is made if necessary.
Based on the factory recommendation we will make a proposal that is technically correct for
This process allows us to optimise the selection from the number of starts and the nut types available.
2D and 3D CAD drawings can be provided.
You have no need to make selection calculations although if you wish to do so guidance is given in our catalogue download
Ball screw nut with radial liner to DIN69051
a) nut with RADIAL liner
b) nut with Frontal deflector