SJW classic screw jack

/SJW classic screw jack
SJW classic screw jack

Project Description

Worm Gear Screw Jack

The Worm Gear Machine Screw Jacks are very popular with competitive prices. Offer positive mechanical action, precise positioning, and uniform lifting speeds. High strength bronze worm gear is used, the payloads from 0.5T to 100T .  A total of 11 sizes are available, each in a traveling nut version and a basic version.

  • Load capacities from 0.5T to 100T.
  • Translating(traveling screw) and rotating (traveling nut) configurations
  • Electric Driven and Manual Operated both are available
  • Trapezoidal spindle (self-locking) and Ball Screw spindle (high efficiency) version
  • Design option: Standard, Anti-rotation, Anti-backlash or Safety nut
  • Standard and custom end fittings, mounting options, and drive shaft
  • Sijie can customize to your specifications

0.5T~15T Worm Gear Drive Screw Jack‎

Maximum Load (T)0.5T1T2.5T5T10T15T
Outer Diameter of screw (mm)162026405055
 Root Diameter of screw (mm)10.814.819.730.538.443.4
Screw Pitch (mm)44581010
Gear RatioH556688
Efficiency %H262121222220
Permissible max. Power ( KW )H0.390.49122.83.1
No-load Torque(N·m)
Permissible torque of input shaft (N·m)*9.819.649153.9292292
Required torque of input shaft at max. Load (N.m)H2.
Screw travel length (mm) per turn of worm shaftH0.80.80.831.331.251.25
Permissible max. Input(rpm) when max. loadH1500750600400300200
Screw torque when max. Load (N·m)8.620.165.1201.5503.6813.2

20T~100T Worm Gear Drive Screw Jack‎

Maximum Load (T)20T30T50T75T100T
Outer Diameter of screw (mm)6585120130150
 Root Diameter of screw (mm)51.367102112127
Screw Pitch (mm)1216161620
 Gear RatioH810.610.610.612
Efficiency %H2019151313
Permissible max. Power ( KW )H58.413.414.421.4
No-load Torque(N·m)3.99.819.629.439.2
Permissible torque of input shaft (N·m)*292735137217642450
Required torque of input shaft at max. Load (N.m)H238.1400.18561380.52040.9
Screw travel length (mm) per turn of worm shaftH1.
Permissible max. Input(rpm) when max. loadH200200150100100
Screw torque when max. Load (N·m)1287.72531.95551.38921.813878.3

SJW Series Worm Screw Jack Ordering Guide Information

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

1: Jack Model

SJ: “SIJIE” brand screw jack
W series machine screw jack

2. Load Capacity
010: Max. 1T lifting force

3: 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

4: Screw Top End

   T: Top plate     H: Clevis end    S: Thread end     R: Plain end    SH: Spherical hinge  U: Forked head

Screw jack Top End

5: 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

6: Gear Ratio

7: Travel Stroke

SJW machine screw jack travel stroke


8:  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
screw jack common layout multiple screw jack configurations