CATALOGUE

PRA double guide anti-rotation
As all screw jacks must have an anti-rotation, in case such constraint cannot be realized externally, it is
possible, for TP models, to have an inner anti-rotation system inside the screw jack.Two guides are mounted
on the rigid protection where a bronze bushing, which is attached to the threaded spindle, can slide.
In case of very long strokes it should be checked that the torsional sliding is not such as to force the fixing
screws in the guides.
As the inner anti-rotation constraints the threaded spindle and its end fitting, in case of presence of holes,
like in TF and TOR end fittings, their position should be indicated, as shown in the drawings below. Unless
otherwise stated all screw jacks will be delivered in position 1 or 3. The overall dimensions are shown in the
table below.
Incompatibility: TPR models – ALEPH series – AR models
A+stroke
1 2 3 4
Rigid protection with double guide PRA anti rotation
XPRA Models*
Size 183 204 306 407 559 7010 8010 9010 10012 12014 14014 16016 20018 25022
A 50 80 80 100 105 120 120 140 170 170 170 170 200 200
B 34 48 65 74 97 127 127 160 160 160 210 210 305 305
C 38 52 71 80 104 134 134 169 210 210 300 300 370 370
* XPRA Model: stainless steel version
For non quoted dimensions see the schemes on pages 60-63
70