How To Choose The Right Screw Jack for My Project

Selection Guide: KMD1T/H/AS/300/TP/SLR/Z/B

1. KMD1T - KMD35T model ball screw jack is withstand the maximum static load capacity 1 ton to 35 ton, not dynamic load capacity. The dynamic loads depends on stroke, travel speed and working conditions. About the safety dynamic load capacity, please contact us. 

Note: All ball screw jacks are not self-locking, they offer increased travel speed and require a brake or external locking device to hold position. 

2. Gear Ratio

H: High gear ratio.

L: Slow gear ratio.

Custom other gear ratios.

Travel Length per turn of worm shaft = screw lead / ratio.

3. Basic Designs

AS: Upright, Translating screw.

BS: Inverted, Translating screw.

CS: Upright, Anti-rotation screw.

DS: Inverted, Anti-rotation screw.

ER: Upright, Rotating screw.

FR: Inverted, Rotating screw.

Note: The CS or DS design with anti-rotation device which is supplied with a square nut at the end of ball screw, inside a square rigid protective tube.

Note: The lifting screw of AS or BS ball screw jacks must be attached to the guided load which prevents the lifting screw from rotating. If your application involves a load which is unattached, unguided or the load is free to rotate and not translate, then CS or DS ball screw jacks are required to prevent lifting screw rotation.

4. Stroke

300: 300mm stroke. Custom Stroke.

Stroke is travel length expressed in millimeter(mm) or inches and not the actual screw length.

Note: long stroke screw jacks with compression loads, please calculate maximum critical buckling force.

5. End Conditions

TP: Top plate.

CE: Clevis end(male clevis).

PE: Plain end.

TE: Threaded end.

BJ: Ball joint.

FE: Fork end(female clevis).

Custom lifting screw ends.

6. Input Shaft(worm) Code and Motor Flange Input Code (Top View)

SSL: Single Input, Left Side Shaft.

SSR: Single Input, Right Side Shaft.

SLR: Double Input Shafts.

SSLMFR: Left Side Shaft and Right Side Motor Flange (Motor Mounts).

MFR: Right Side Motor Flange (Motor Mounts).

SSRMFL: Right Side Shaft and Left Side Motor Flange (Motor Mounts).

MFL: Left Side Motor Flange (Motor Mounts).

7. Additional Options(Accessories)

Connection Devices: Couplings(C), Universal joints(U), Telescopic universal joints(T) and Connecting shafts(L).

Protective Devices: Bellows boot(B), Telescopic spring covers(S) and Rigid Protective tubes(Z).

Manual Operation: Aluminum handwheels(AH) and Cast iron handwheels(CH).

Electric Driven: Electric motor(M), AC or DC asynchronous motors (normal, YEJ brake, YVP variable frequency, B explosion proof, D multi-speed), stepper motors, servo motors with encoders and controllers. IEC motor flange and NEMA C-Face motor adapter for connect with motors.

Safety Devices: Limit switches, Proximity switches(P), Safety nuts(SF), Anti-backlash nut(AB), Overload safety couplings(SC), Stop nuts(SN), Position Encoders(E), Overload clutch(OC), Brake motor, Linear braking elements(BE), Wear detection/monitors(WM), Linear guides and rails(LG), Frequency inverters(FI), Potentiometer(PM) and Pressure sensor(PR).

Others: Travel nuts, Position indicators(I), Trunnion adapter plates(SP), Trunnion mounting brackets(SPF), Pillow blocks(PB), Flange blocks(FB) and Ball joint(BJ).