SKF Ultra Power range of Planetary Roller Screws has been optimised to provide the maximum possible life within a compact space envelope. This has resulted in an increase in capacity of up to 60 % over the standard product. Load capacity is independent of lead. To attain L10 life performance a mean working load of up to 80 % of Ca is allowed (50 % for HRP/HRC 60). The maximum load should not be applied on the mounting bolts but on the flange.

Drawing (click to enlarge)

 

Nut type

Nut with non-central flange

 
 

Nominal screw diameter

d0 [mm]

75

 
 

Lead

Ph [mm]

20

 
 

Dynamic Load

Ca [kN]

643

 
 

Static Load

Coa [kN]

1 855

 
 

Max length

[mm]

5 500

 
 

d2

[mm]

73,1

 
 

d1

[mm]

77,3

 
 

Screw mass

ms [kg/m]

34,7

 
 

Screw inertia

Is [kgmm2/m]

24 400

 
 

Nut mass

mn [kg]

20

 
 

Nut inertia

Inn [kgmm2]

73 400

 
 

Q

[mm]

M8x1

 
 

D3

[mm]

87

 
 

D

[mm]

150

 
 

A

[mm]

213

 
 

A1

[mm]

30

 
 

A3

[mm]

40

 
 

B

[mm]

10

 
 

Grease quantity for nut

Zn [cm3]

170

 
 

D1

[mm]

195

 
 

A2

[mm]

35

 
 

u

[°]

15

 
 

Number of hole

[N ]

12

 
 

d

[mm]

13,5

 
 

J

[mm]

174

 
 

G

M12

 
 

Rollers inertia

Ins [kgmm2]

5 130

 

Note :
For SKF Ultra Power range a mean working load of up to 80% of Ca is allowed.