Page 8 of catalogue Ground ball screws of SKF Linearsysteme GmbH

2 Recommendations Selection

Manufacturing precision
Generally speaking, the precision indication given in the designation defines the lead precisions see page 11 – lead precision according to ISO – (ex. G5 - G3…). Parameters other than lead precision correspond to our internal standards (generally based on ISO class 5). If you require special tolerances (for example class 5) please specify when requesting a quotation or ordering.

Materials and heat treatments
Standard screw shafts are machined from steel which is surface hardened by induction (C48 or equivalent). Standard Nuts are machined in steel which is carburized and through hardened (18 Ni CrMo5 or equivalent). Hardness of the contact surfaces is 5962 HRc, depending on diameter, for standard Screws.

Number of circuits of balls
A nut is defined by the number of ball turns which support the load. The number is changing, according to the product and the combination diameter/lead. It is defined by the number of circuits and their type.

Working environment
Our products have not been developed for use in an explosive atmosphere, consequently we cannot take any responsability for the use in this field.

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