SKF - Linear Motion Standard Range

3 Ball & roller screws
Precision rolled ball screws
Rotating nut
The nut rotates inside bearings and moves
along the fixed long lead screw shaft.
The drive motor moves with the nut,
so inertia and critical speed problems,
associated with a long rotating shaft, are
minimised (figs. 10 and 11).
Two versions are available:
SLT: rotating nut using ball screw with axial
play
TLT: rotating nut using ball screw with
backlash elimination.
Nominal
diameter
mm
Lead
(right
hand)
Ball screw capacities
SL
Basic load ratings
TL
Basic load ratings
Bearing
Basic load ratings
P h C a C oa C a C oa C a C oa
kN
25 20 39,2 97,0 21,6 48,5 61,8 56
25 33,2 80,4 18,3 40,2 61,8 56
32 20 49,6 141,8 27,3 70,9 78 76,5
32 32,2 88,6 17,3 44,3 78 76,5
40 25,3 67,0 13,9 33,5 78 76,5
40 20 54,2 176,5 29,8 88,3 93,6 91,5
40 51,7 130,5 28,5 65,3 114 118
50 50 92,9 235,1 51,2 117,6 156 166
L8
L 9
L 2
L 1
L 7
L 6
Rotating nut inertia
Size Inertia pulley support Mass of rotating nut
D2
D1
D3
D5
D6
kgmm 2
kg
Z 2 x H 2
R
H 3 R
L 3
L 4
L
L 5
D7
Z 1 x H 1
D4
25 ¥ 20 1 012 4,5
25 ¥ 25 1 023 4,6
32 ¥ 20 1 935 7,2
32 ¥ 32 1 919 7,1
32 ¥ 40 1 949 7,1
40 ¥ 20 3 095 7,5
40 ¥ 40 3 784 8,4
50 ¥ 50 11 482 15,5
Rotating nut capacities
J 2 J 1
Size Max transmissible Max transmissible
torque
axial load
Nm
kN
25 ¥ 20 180 68,3
25 ¥ 25 180 68,3
32 ¥ 20 209 107
32 ¥ 32 209 87,3
32 ¥ 40 209 81,7
40 ¥ 20 240 116
40 ¥ 40 246 93,3
50 ¥ 50 803 162
Symbols, see page 191
136