SKF has developed a unique CNC process and equipment for high precision rolled screws. The combination of Hightech machines and the control of the cold forming and metallurgical processes result in a screw that has virtually the same accuracy and performance of a ground unit at a lower cost.

Drawing (click to enlarge)

 

Nominal screw diameter

d0 [mm]

20

 
 

Lead

Ph [mm]

5

 
 

Preload

Axial play

 
 

Dynamic load category

[kN]

10-20

 
 

Max length

[mm]

5 000

 
 

Dynamic Load

Ca [kN]

11,7

 
 

Static Load

Coa [kN]

18,3

 
 

Number of ball circuits

3

 
 

Max. axial play

[mm]

0,1

 
 

Reduced max. axial play

[mm]

0,05

 
 

Nut mass

mn [kg]

0,24

 
 

Screw mass

ms [kg/m]

2

 
 

Screw inertia

Is [kgmm2/m]

85

 
 

d2

[mm]

16,7

 
 

d1

[mm]

19,4

 
 

D1

[mm]

36

 
 

D4

[mm]

47

 
 

D5

[mm]

6,6

 
 

D6

[mm]

58

 
 

Ltn

[mm]

44,5

 
 

L1

[mm]

10

 
 

L7

[mm]

10

 
 

L8

[mm]

44

 
 

L10

[mm]

8

 
 

L11

[mm]

5

 
 

Design

1