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 stroke 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
Available on request:
■ Supplied complete with fixing flange and extension shaft for display with “OP3, OP7 and EP7” position indicator (see dimensions MAR50 FL-OP3/OP7)
■ Rigid protection in aluminium (as option in stainless steel) with AISI 303 stainless steel spiral spring up to 400mm lengths






L = stroke length (mm)
1. Trapezoidal screw Ø18x4
2. Nr. 3 fixing screws M4 


MAR50-PROT with protection spring

L = stroke length (mm)
1. Vite trapezia Ø18x4
2. Nr. 3 M4 di fissaggio  


MAR50 FL-OP3 complete with fixing flange and extension shaft for display with “OP3” position indicator


MAR50 FL-OP7 complete with fixing flange and extension shaft for display with “OP7/EP7” position indicator


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


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 
Support units (with square flange) with o.ring, and ball-bearings.
• Available shafts Ø6Ø8Ø10Ø14Ø20.
They can be used severally on screws, female screws, shafts or can be combined with our gearboxes, flexible shafts, and our position indicators type “OP”.
 for more complete information, see sec. "Flexible & semi-rigid shafts,..." in the drop-down menu on the left. 

Flanged supports with extension shaft for coupling with position indicators.
 for more complete information, see sec. "Flexible & semi-rigid shafts,..." in the drop-down menu on the left. 

The «GC» cardan joints used for the transmission of torque and movement of non-aligned elements.
Main features: universal application, high reliability, maintenance free, extremely precise and ease-of-use.  
• Case entirely machined from solid, in stainless steel AISI303.
• Sliding bushes in self-lubricating plastic material, suitable for intermittent (UI) and continuous movements (UC).
• Maximum working angle 45 °.
• Available bores: ø6 - ø8 (combinable with each other);  ø10 - ø14 (combinable with each other).

 for more complete information, see sec. "Flexible & semi-rigid ..." in the drop-down menu on the left.

Telescopic shaft combinable with cardan joints CG.-
• Case in stainless steel AISI303; sliding bushes in self-lubricating plastic material.

➜ for more complete information, see sec. "Flexible & semi-rigid ..." in the drop-down menu on the left.

Perfectly interchangeable with indicator OP6 but closer. The total height of  indicator OP7 with spacer flange or block flange is the same of OP6.
 The coupling of numbers with a rubber-joint allows, especially in high ratios, a bigger flowability and manoeuvre speed.
• 5 digits counter (standard red digit indicates decimals; on request 2 red digits for hundredths or 5 black digits for mm) and a red digit with hundredth divisions for more reading accuracy. Readings until  99999. ‘Lens to improve the reading’: digit height 7 mm.
• Shock-proof self-extinguishing technopolymer case. Protection IP64. Max. temperature 80°C.
• Reading with 18° inclined or frontal view
• Standard shaft bore ø20 (OP7) or ø25 bore (OP7F25). Other holes smaller than 20 with reducing bush.
 for more complete information, see sec. "Hollow shaft position indicators..." in the drop-down menu on the left.  

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                                        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 


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

In case of continuous use, please contact our Technical Dept. In such applications, a grease fitting will be installed to allow periodic addition of lubricant with a frequency based on the work conditions.

⁃ 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.