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Linear motion Screw Jacks
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Screw jacks or screwjacks transform a rotary input into linear movement in a vertical or horizontal plane.  Both push and pull loads are acceptable in any mounting orientation.  Inputs are generally from electric motors connected by couplings or directly by flange.

Servomech Screw Jacks deliver medium to high forces (5 to 1000kN) in linear motion for strokes that can be chosen between 100mm and 6m. Linear speeds up to 300 mm/s and duty cycles up to 40% are possible with acme screw jacks.  Higher speeds and duty cycles to 100% can be achieved with ball screw jacks.
A comprehensive range of options includes safety nuts, motorised models and stroke limit switches.

Multiple screw jacks can be combined into a lifting system.  Powered by a geared motor, the jacks are connected often in an ‘H’ configuration by couplings and bevel gears.  Techdrives can supply complete lifting systems, talk to our Engineers.

Techdrives are the UK agents for Servomech, specialists in linear motion with over 20 years experience in the manufacture of linear actuators and screw jacks. Two standard ranges are offered: the SJ standard and the MA high efficiency.

TYPE SJ FOR GENERAL PURPOSE USE, 5 TO 1000KN (100 TONNE)


SJ acme screw jacks suit general duties with loads from 0.5 to 100 tones.  Fourteen models suit lifting loads from 5 to 1000kN and linear speeds can be up to 85.7mm/s.  Maximum duty cycles are up to 30% based on a 10 minute period.  Strokes up to 6m are possible subject to load guidance and critical speeds.


SJ screw jacks have a monobloc housing in cast iron (except SJ05 & SJ10 in aluminium).  The square shape is easy to mount. Acme screws are constructed in C43 steel with 1 or 2 starts.  SJ screw jacks have 4 ratios per size, also a choice of 1 or 2 start acme screws.


SJ screw jacks are available in travelling screw and travelling nut designs.  They have equal dynamic performance and the choice depends on your mounting/installation.

ACME SCREW JACKS FOR MEDIUM TO HIGH FORCE LINEAR MOTION

TRAVELLING NUT & TRAVELLING SCREW JACKS 0.5 TO 100 TONNE

Travelling screw

Travelling nut

screw jacks - travelling screw

TYPE MA WITH HIGH EFFICIENCY 5 TO 350KN (35 TONNE)

Type MA acme screw jacks are part of the Techdrives product range and feature upgraded construction for increased loads and duties.  Eight models suit lifting loads from 5 to 350kN and linear speeds up to 300mm/s are possible.  Maximum duty cycles are up to 40% based on a 10 minute cycle, strokes up to 6m are possible subject to load guidance and critical speeds.

Travelling screw and travelling nut designs are available with equal performance.  Each model has 4 possible gear ratios and in adddition the acme screws can be 1,2,3 or 4 start resulting in a precise match to the required performance.

Standard options include electric motors, safety nuts, protective tubes, bellows, trunnion mounting, anti-turn, microswitches, wear detection and adjustable backlash.

Model

Max
Force
kN

Acme
Screw Tr

SJ5

5

18 x 4

SJ10

10

22 x 5

SJ25

25

30 x 6

SJ50

50

40 x 7

SJ100

100

55 x 9

SJ150

150

60 x 12

SJ200

200

70 x 12

LINKS:

DOWNLOADS

Servomech screw jacks designed and manufactured in Bologna have been supported in the UK by Techdrives engineers for over 15 years.  Also known as screwjacks, these acme thread screw jacks are designed for general duties where force (0.5 to 100 tonnes) and stroke (up to 6m) are the key criteria.  Where higher speeds and efficiency are needed see also our Ball Screw Jacks.

See our FAQ’s, Quick selector and Catalogue Downloads.

See the catalogue for more details on lifting systems.

 sj travelling nut screw jack

Model

Max
Force
kN

Acme
Screw Tr

SJ250

250

80 x 12

SJ300

300

90 x 12

SJ350

350

100 x 12

SJ400

400

100 x 12

SJ600

600

120 x 14

SJ800

800

140 x 14

SJ1000

1000

160 x 14

Model

Max
Force
kN

Acme
Screw Tr

MA5

5

18 x 4

MA10

10

22 x 5

MA25

25

30 x 6

MA50

50

40 x 7

MA80

80

55 x 9

MA100

200

60 x 12

MA200

200

70 x 12

MA350

350

100 x 16

MA travelling nut jacks screw jacks - travelling nut

Travelling screw

Travelling nut