Project Description

Worm Gear Screw Jack

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These worm gear screw jacks are very precision and reliability, it can meet all the necessary safety, cost-efficiency, and durability mandates of your application. 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.

  • Worm gear drive screw jack
  • 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

Maximum Load (T)1T2.5T5T10T15T
Outer Diameter of screw (mm)2026405055
 Root Diameter of screw (mm)14.819.730.538.443.4
Screw Pitch (mm)4581010
Gear RatioH56688
Efficiency %H2121222220
Permissible max. Power ( KW )H0.49122.83.1
No-load Torque(N·m)0.290.621.422.6
Permissible torque of input shaft (N·m)*19.649153.9292292
Required torque of input shaft at max. Load (N.m)H6.216.148.790.7149
Screw travel length (mm) per turn of worm shaftH0.80.831.331.251.25
Permissible max. Input(rpm) when max. loadH750600400300200
Screw torque when max. Load (N·m)20.165.1201.5503.6813.2

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

NDM Series Worm Gear Screw Jack Ordering Guide Information

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

1: Worm jacks Model

NDM series worm screw jack

2. Load Capacity

1T: 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

We have been supplied worm gear screw jack and lift system since 2008.

  • Has the unique ability to provide complete 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.