Screw Jack Assembly Types – Type A (Upward) vs Type B (Downward) Movement
Screw Jack Assembly Types – A (Upward) vs B (Downward)
Each screw jack structure type (Type 1 and Type 2) is available in two assembly configurations – Type A and Type B. These determine the direction of movement.
Type A – Upward Movement
In Type A assembly, the screw (or nut) moves upward
The working end of the screw is positioned above the gearbox
The screw extends upward when activated
Ideal for lifting applications
Type B – Downward Movement
In Type B assembly, the screw (or nut) moves downward
The working end of the screw is positioned below the gearbox
The screw extends downward when activated
Ideal for pushing down or suspended applications
How to Choose
| Factor | Choose Type A | Choose Type B |
|---|---|---|
| Load Position | Load is above gearbox | Load is below gearbox |
| Movement Direction | Need to lift up | Need to push down |
| Installation | Gearbox mounted below load | Gearbox mounted above load |
| Application | Lifting platforms, scissor lifts | Presses, suspended equipment |
Important Note
When selecting assembly type, consider the load direction and installation orientation. The wrong choice
can lead to improper operation or premature wear.
Model Code Example
SWL10-1A-II = SWL series, Type 1 structure, Type A assembly (upward), Type II screw head (flanged)
