|
Aero-Motive
Reels, Balancers |
|
Coffing Hoists
Hoists, Hoist
Repair |
|
CM Hoists
Chain
Hoists, Wire Rope, Ratchet Levers, Trolley
|
|
Conductix
Power and Data Transfer Systems |
Demag
Overhead Cranes
Hoists and Winches Gearmotors
Ergonomic Systems |
|
Duff-Norton Mechanical
Actuators, Rotary Unions, Electromechanical Actuators |
|
Equipto
Storage Systems |
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Hilman Rollers
Riggers Sets |
Harrington Hoists
Chain & Wire Hoists |
|
Joyce/Dayton
Jacks, Actuators |
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Lyon
Tool Storage, Locker Units
|
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Perfecting Coupling |
|
Ram-Pac
Hydraulic Tools
|
Stanley Bostitch
Pneumatic Tools, Fasteners
|
Simplex
Jacks and Braces |
|
In-Plant Offices, Mezzanines
|
 |
| |
|
Machine
Screw Jacks
20 Ton Capacity |
|
| Model
Number |
WJ820
WJ2420 |
DWJ820
DWJ2420 |
| .pdf
Drawing (Acrobat Reader Required) |
View .pdf
Drawing |
View .pdf
Drawing |
| Lifting
Screw Diameter (Inches) |
2 1/2 |
2 1/2 |
| Thread
Pitch/Lead |
.500 PITCH
ACME |
.375 PITCH
.7.50 LEAD ACME |
| Worm Gear
Ratio |
8:1
24:1 |
8:1
24:1 |
| Worm
Shaft Turns For 1" Travel |
16
48 |
10.67
32 |
| Maximum
H.P. @ Worm RPM |
3.53
1.56 |
3.53
1.56 |
| Operating
Torque* (Inch Lbs.) @ Worm RPM |
.051W*
.022W*
@ 200 RPM |
.061W*
.026W*
@ 200 RPM |
| Screw
Torque** (Inch Lbs.) |
.227W* |
.272W* |
| Efficiency
Rating % Approx. |
19.6
15.4 |
24.5
19.3 |
| Basic
Jack Weight (Lbs.) |
75 |
77 |
| Add to
Basic Jack Weight (Lbs.) For Each Additional 1" Of Travel |
2.6 |
2.6 |
Important:
Series DWJ may lower under load. External locking
systems are required.
*W = load in pounds.
* Operating torque: torque required for a given load increases
as speed decreases.
** Screw torque is the force required to keep the screw form
rotating. |
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