Screw jacks

Lifting and actuation systems

The FIAMA series of screw jacks is a modular mechanical system, for a complete and versatile solution, which transforms rotary movements into linear «push/pull» movements.
• Trapezoidal screw in AISI 304, stainless steel, TPN Ø18 thread - 4mm pitch
• Case in anodized aluminium, shafts and gears treated with wear-resistant surface hardening
• Trapezoidal screw standard lenghts in mm: 100 - 200 - 300 - 400 - 700 - 1000
• Maintenance-free: lubricated with long-life “Klüber grease
• Can be used individually or combined using flexible shafts, couplings and gearboxes
• Manual or motorized motion
• Possibility to apply a display unit

➤ Available on request:
• Rigid protection in aluminium (as option in stainless steel) with AISI 303 stainless steel spiral spring up to 400mm lengths.

For applications with displays, motors, multiple screw jacks and combinations with flexible or rigid shafts and gearboxes, please contact the Engineering Dept. 

There are many possibilities of application: wherever it is necessary to lift important loads, adjust heights or format changes in automatic machines for plastics, metals, food, textile, printing, packaging, labeling, filling, assembly lines, lifting/adjustment platforms, elevation/lifting mechanisms. 




1. Trapeziodal screw Ø18x4
2. Nr. 3 fixing screws M4  

MAR50-PROT -------------------------------------------------------------------

1. Trapeziodal screw Ø18x4
2. Nr. 3  fixing screws M4 


Installation must not create radial/lateral loads, which are the main cause of failure, on the threaded bar. The plane to which the screw jack is fixed and the threaded bar must be orthogonal and the load and the bar must be coaxial avoiding eccentricity. When applying multiple jacks (connected also by transmissions) the terminals must be perfectly aligned so that the load is uniformly distributed; in this case it is recommendable to use couplings to compensate misalignments.
• Load (N) = the force which is applied to the threaded bar of the screw jack
   (10 N  1 kg)
• Linear speed (mm/min) = the desired linear speed of the load; it is recommendable to limit the input rotary speed to max 1500 rpm
• Stroke (mm) = it is the linear distance that the load must be moved, generally it coincides with the total length of the threaded bar
• Protective cover (optional) = necessary to protect the bar in case of contamination, dust, foreign objects and/or oscillating installation and movements
• Torque (Nm) = torque required for the handling of the load

                                             RADIAL AND AXIAL LOADS                                       

The loads acting on the shafts can be of two types: radial ‘FR’ (radial force) and axial ‘FA’ (axial force), referred to the axis of the shaft; when ordering specify whether the axial load is pull or push type.
FR - force / radial load acting in perpendicular direction to the shaft / axis
FA - force / axial load acting of the shaft / axis


Access to Reserved Area

Did you forget your password?

Richiedi l'accesso

*Required replies

                                                RADIAL AND AXIAL LOAD                                              

The loads are generated by the items connected to the gear reducer and can be created for example by the pull of belt drives, accelerations and decelerations, structural misalignments, vibrations, shocks, etc. The loads acting on the shafts can be of two types: radial ‹FR› (radial force) and axial ‹FA› (axial force), referred to the axis of the shaft; when ordering specify whether the axial load is pull or push type. 

                                             TECHNICAL FEATURES                                               

Screw rotation direction DX / clockwise
Screw dimension

TPN Ø18 - pitch 4 mm

Spiral spring material AISI 303: stainless steel   
Carter: material

aluminium: black anodized 

Carter: weight

1 kg

Screw weigth/m 1,4 kg          
Shafts: material steel with surface treatment
Gears: material steel with surface treatment
Grease lubrication Klüber AG 11-462  
FR  radial load 100 N (10 N  1 kg)
FA axial load push/pull 1000 N  (10 N  1 kg)
Screw load  not allowed
Max rotation input speed (1/min)  1500 rpm 
Max gear-play tolerance   0,75° ÷ 1.5°
Life  10.000 hours
Working temperature  -20 +80°

i 1/1 1/2,5 1/5 1/7,5 1/10 1/12,5 1/15 1/25 1/30
R    % 0,72 0,74 0,60 0,61 0,54 0,39* 0,45* 0,25* 0,29*

TI  Nm

13,95 5,42 3,32 2,19 1,84 2,04 1,48 1,62 1,13
TO Nm 10 10 10 10 10 10 10 10 10
v mm/s  100 40  20 13,3 10 6,6  3,3 

* irreversibility

i   = transmission ratio
R  = efficiency 
TI  = input torque
TO = output torque
v = linear speed


⁃ To identify the most suitable gear reducer for your requirements, refer to the values in the table. If the real loads and efficiency are very close to the table values, contact the technical department. 
⁃ All tables show linear measurements expressed in <mm>, unless otherwise specified. 
⁃ All the reduction ratios are expressed as a <fraction> unless otherwise specified. 
⁃ All forces, efficiency and the loads are expressed in <N or Nm> (10 N ≅ 1 kg or 10Nm ≅ 1Kgm ) unless otherwise specified.