SJM machine screw jack

/SJM machine screw jack
SJM machine screw jack

Project Description

machine screw actuators

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This machine screw jack has low cost and large stock. It offers positive mechanical action, precise positioning, and uniform lifting speeds. The payloads from 1 ton to 120 ton.  A total of 9 sizes are available, each in a traveling nut version and a basic screw translating version.

  • Electric Driven and Manual Operated both are available
  • Self-locking under static conditions
  • Option: Anti-rotation, anti-backlash, safety nut
  • Right hand and left-hand screw threads are available
  • Standard and custom end fittings, mounting options, and drive shaft
  • Several Screw jacks can be synchronised by means of connection shafts and an electronic controller.
  • Worm gear machine screw jacks are typically used to move heavy loads in low-duty-cycle setups and low-speed applications.
Machine Jack ModelSJM2.5

(2.5 ton)


(5 ton)


(10/15 ton)


(20 ton)


(25 ton)


(35 ton 


(50 ton)


(100 ton)


(120 ton)

Max. Lifting Force (  KN )2550100/15020025035050010001200
Max. Pulling Force( KN )25509916625035050010001200
Lift Screw( mm )Tr30×6Tr40×7Tr58×12Tr65×12Tr90×16Tr100×18Tr120×20Tr160×23Tr180×25
Gear Ratio ( high )1/61/63/231/83/323/323/321/121/12
Travel length(mm)

per full turn of worm Shaft ( H )

Efficiency % ( H )232123211918151312
Gear Ratio ( Low )1/241/241/231/241/321/321/321/361/36
Travel length(mm)

per full turn of worm Shaft ( L )

Efficiency % ( L )14121513111111108
Max. Length of lifting screw (mm)

when tensile force

Max. Permissible power

( KW )

Lubricant ( kg )
Weight without stroke

( kg )

Weight of screw ( kg )

per 100mm stroke

Max. Permissible power is under the conditions that ambient temperature 20 degree c , duty cycle 20%h and input speed 1500rpm

SJM Series machine screw jack actuator Ordering Guide Information

SJM – 010  –  US   T  –    C –    1/6  –  300   –  Y
                        2        3        4         5          6          7

1: Machine Jack Model

SJM2.5, SJM5, SJM10, SJM20, SJM25, SJM35, SJM50, SJM100, SJM120.

2: Screw Configuration & Mounting Orientation

US: Upright translating screw        UK: Upright keyed screw        UR: Upright rotating screw
IS: Inverted translating screw         IK: Inverted keyed screw         IR: Inverted rotating screw

Note:  US, IS (Screw rotation, do axial motion)  UK, IK (Screw anti-rotation, do axial motion)

UR,IR(Screw fixed rotation, traveling nut do axial motion)

SJW Screw Configuration & Mounting Orientation

3: Screw Top End

Screw jack Top End

4: Worm Shaft Input Types

A: left side worm shaft input.
B: right side worm shaft input.
C: double worm shaft input.
M1: left side motor flange direct input.
M2: right side motor flange direct input.
M3: left side motor flange direct input, right side worm shaft input.
M4: right side motor flange direct input, left side worm shaft input.

Worm Shaft Input Types

5: Gear Ratio

  • SJM2.5: 1/6, 1/24.
  • SJM5: 1/6, 1/24.
  • SJM10: 3/23, 1/23.
  • SJM20: 1/8, 1/24.
  • SJM25: 3/32, 1/32
  • SJM35: 3/32, 1/32
  • SJM50: 3/32, 1/32
  • SJM100: 1/12, 1/36
  • SJM120: 1/12, 1/36.

6: Travel Stroke

SJW machine screw jack travel stroke


7:  Accessories

N: Standard Jack, No additional accessories
P: Protective Tube
R: Dust Cover
Y: Hand Wheel
Other accessories,please check below picture

screw jack accessories onescrew jack accessories twoscrew jack accessories threescrew jack accessories four

Sijie Indutrial has been supplied electric machine scew jacks, actuators and lifting system since 2008.

  • Has the unique ability to provide complete jack system lifting solutions with 3D models.
  • Providing “turn key” solutions with the optimal balance of performance, life, and cost.
  • Wide application experience in diverse industries including transportation, packaging, factory automation, material handling, printing, automotive, machine tool, paper, steel, food and beverage etc.

You can trust us on high quality, on-time delivery, controlled costs and reduced risk. Let us help you.