Machine Screw Jacks
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SJW-Series
SJC-Series
SJM-Series
SJWG-Series
SIJIE
SJW Worm Gear Screw Jack
Key Features
The machine screw jack is a basic lifting component with the advantages of compact structure, small volume, easy installation, high reliability, and long service life. Single jack or multiple jacks system arrangements are available. Available in ten sizes, these machine screw jacks’ load capacity is from 1 ton to 100 ton as standard, customized 150 tons,200 tons,250 tons.
Alloy steel input shafts
ZQAl9-4 tin bronze worm gears
Tapered roller bearing or ball thrust bearings offer rugged reliability
Double input shafts standard
Translating screw, rotating screw, keyed screw configurations in upright or inverted mounting orientation
Electric driven and manual operated both are available
Protective tube and bellows are available
Anti-backlash devices, safety nut, and Anti-rotation are available
Customized machine screw jacks can be made to your specifications
Specifications & ordering information
my faq
Machine Screw Jacks Specifications
| Specifications | ||||||||||
| Model | SJW-010 | SJW-025 | SJW-050 | SJW-100 | SJW-150 | SJW-200 | SJW-300 | SJW-500 | SJW-750 | SJW-1000 |
| Max. Lifting Load ( KN ) | 9.8 | 24.5 | 49.0 | 98.0 | 147 | 196 | 294 | 490 | 735 | 980 |
| Outer Diameter Of Screw ( mm ) | 20 | 26 | 40 | 50 | 55 | 65 | 85 | 120 | 130 | 150 |
| Root Diameter Of Screw ( mm ) | 14.8 | 19.7 | 30.5 | 38.4 | 43.4 | 51.3 | 67 | 102 | 112 | 127 |
| Thread Pitch ( mm ) | 4 | 5 | 8 | 10 | 10 | 12 | 16 | 16 | 16 | 20 |
| Gear Ratio ( H ) | 1/5 | 1/6 | 1/6 | 1/8 | 1/8 | 1/8 | 3/32 | 3/32 | 3/32 | 1/12 |
| Efficiency % ( H ) | 21 | 21 | 22 | 22 | 20 | 20 | 19 | 15 | 13 | 13 |
| Screw Travel(mm) Per Turn Of Worm Shaft( H ) | 0.80 | 0.83 | 1.33 | 1.25 | 1.25 | 1.50 | 1.50 | 1.50 | 1.50 | 1.67 |
| Gear Ratio ( L ) | 1/20 | 1/24 | 1/24 | 1/24 | 1/24 | 1/24 | 1/32 | 1/32 | 1/32 | 1/36 |
| Screw Travel(mm) Per Turn Of Worm Shaft( L ) | 0.20 | 0.21 | 0.33 | 0.42 | 0.42 | 0.50 | 0.50 | 0.50 | 0.5 | 0.56 |
| Efficiency % ( L ) | 12 | 12 | 14 | 15 | 14 | 13 | 11 | 10 | 9 | 8 |
| No-Load Torque ( N.m ) | 0.29 | 0.62 | 1.4 | 2.0 | 2.6 | 3.9 | 9.8 | 19.6 | 29.4 | 39.2 |
| Max. Permissible Input Power ( KW ) ( H ) | 0.49 | 1.0 | 2.0 | 2.8 | 3.1 | 5.0 | 8.4 | 13.4 | 14.4 | 21.4 |
| Max. Permissible Input Power ( KW ) ( L ) | 0.36 | 0.46 | 0.63 | 1.4 | 2.2 | 3.2 | 4.6 | 5.7 | 7.2 | 9.4 |
| Permissible Input Torque ( N.m ) | 19.6 | 49.0 | 153.9 | 292.0 | 292.0 | 292.0 | 735.0 | 1372.0 | 1764.0 | 2450 |
| Max. Load, Required Input Torque ( N.m ) ( H ) | 6.2 | 16.1 | 48.7 | 90.7 | 149.0 | 238.1 | 400.1 | 856.0 | 1380.5 | 2040.9 |
| Max. Load, Required Input Torque ( N.m ) ( L ) | 2.9 | 7.4 | 20.0 | 45.3 | 72.3 | 124.0 | 244.0 | 453.3 | 761.3 | 1278.3 |
| Max. Load, Permissible Input Speed( rpm) ( H ) | 750 | 600 | 400 | 300 | 200 | 200 | 200 | 150 | 100 | 100 |
| Max. Load, Permissible Input Speed( rpm) ( L ) | 1200 | 600 | 300 | 300 | 290 | 250 | 180 | 120 | 90 | 70 |
| Max. Load, Lifting Screw Output Torque( N.m ) | 20.1 | 65.1 | 201.5 | 503.6 | 813.2 | 1287.7 | 2531.9 | 5551.3 | 8921.8 | 13878.3 |
| Remarks: 1: Efficiency is under grease lubrication 2: H: High speed gear ratio L: Low Speed Gear Ratio | ||||||||||
Machine Screw Jacks Ordering Information Part Number:
SJW-050 - US - T - C - 1/6 - 300 - P
1 2 3 4 5 6 7
1: Jack Model
SJW-010, SJW-025, SJW-050, SJW-100, SJW-150, SJW-200, SJW-300, SJW-500, SJW-750, SJW-1000.
Before selecting the jack model, please check above machine screw jacks specifications.
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)
3: Screw End Conditions
 |
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 |
 |
 |
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| T: Top Plate | H: Clevis End | R: Plain End | S: Thread End | U: Forked Head | SH:Spherical Hinge |
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.
A B C
5: Gear Ratio:
SJW-010: 1/5, 1/20. SJW-025: 1/5, 1/20. SJW-050: 1/6, 1/24. SJW-100: 1/8, 1/24 SJW-150: 1/8, 1/24
SJW-200: 1/8, 1/24 SJW-300: 3/32, 1/32. SJW-500: 3/32, 1/32. SJW-750: 3/32, 1/32. SJW-1000: 1/12, 1/36
6: Travel Stroke
No standard travel stroke, all the machine screw jacks’ travel strokes are processed according to customers' requirements.
7: Accessories
P: Protective Tube Standard
R: Dust Cover( Bellows boot)
Y: Hand Wheel
Other accessories,please check below picture
