- Available for machine screw jacks
- Available for metric (trapezoidal) jacks
- Limits lifting screw endplay
- Anti-backlash Devices
1-800-523-5204 or 1-937-294-6261
Joyce metric screw jacks, series MWJ, are specifically designed for applications that must be fully metric. Both upright and inverted configurations operate at full capacity whether the load is in tension or compression. These jacks are commonly used in OEM machinery manufactured in the U.S. and shipped to other countries. They are fully interchangeable with several European products.
Parts list and exploded views are included in the O&M Manual. Serial numbers are attached to the product housing.
Joyce/Dayton provides motor controls ranging from simple Motor Starters to complex positioning systems and Custom controls. Every system that is powered by an electric motor requires a control system. At Joyce, we know that choosing the best option can sometimes be a challenge. That’s why our Engineers are available to help you through the process.
![]() Anti-backlash Devices
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![]() Encoders
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![]() Finishes
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![]() Follower Nuts
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![]() Hand Wheels
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![]() Input Shaft (worm)
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![]() Limit Switches
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![]() Lubrication
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![]() Machine Screws
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![]() Mechanical Counters
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![]() Motor Mounts
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![]() Potentiometers
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![]() Protective Boots
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![]() Screw Stops
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![]() Thrust Rings
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Click on the part number to reveal additional informaton about jack designs and shaft codes.
10 kN | 25 kN | 50 kN | 100 kN |
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MWJ51 MWJ201 |
MWJ62.5 MWJ122.5 MWJ242.5 |
MWJ65 MWJ125 MWJ245 |
MWJ810 MWJ2410 |
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U=Upright |
I=Inverted |
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1=T1 |
2=T2 |
3=T3 |
4=T4 |
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S=Translating |
K=Keyed for Non Rotation |
N=Traveling Nut |
D=Double Clevis |
R=KFTN Trunnion* |
* Standard trunnion mounts available on 2-ton through 20-ton jacks.
Rise is travel expressed in millimeters and not the actual screw length.
Left Side Shaft Code |
Right Side Shaft Code |
XXXX=Remove |
XXXX=Remove |
Screw stops are optional on metric screw jacks. When specified, the closed height of the jack and/or the protection tube length may be increased. When boots are added to metric screw jacks, the closed height of the jack may be increased.
CNT0=0.001" Increments
Note: Contact Joyce/Dayton for availability and options.
HW04=4" dia
HW06=6" dia
HW08=8" dia
HW10=10" dia
HW12=12" dia
POTA=0-10V (IP65)
POTB=4-20MA (IP65)
POTC=0-10V w/2 switches*
POTD=4-20MA w/2 switches*
*Optional IP65 rating available
ENCX=Encoder
ELS2=2 Position Electronic Switch
ELS4=4 Position Electronic Switch
ELS6=6 Position Electronic Switch
Size | Code |
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1/4 HP | K |
1/3 HP | A |
1/2 HP | B |
3/4 HP | C |
1 HP | D |
1-1/2 HP | E |
2 HP | F |
3 HP | L |
5 HP | G |
7-1/2 HP | H |
10 HP | I |
15 HP | J |
Ordering Example:
MMA A (Motor code from chart above)
MMA=56C
MMB=140TC
MMC=180TC
MMD=210TC
Standard motor adapters are aluminum
Ordering Example:
LA (Models) 1(Number of DPDT Switches) 3(Available Positions)
Model | Code | Available Positions | |||||||||
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LS7-402 | LI |
Number of DPDT Switches NOTE: Will always be 0 for LS7 models |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
LS8-402 | LA | Left Side Shaft Options | ![]() |
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LS8-504 | LB | ||||||||||
LS9-502 | LC | ||||||||||
LS9-503 | LD | Right Side Shaft Options | ![]() |
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LS9-504 | LE | ||||||||||
LS9-505 | LF | ||||||||||
LS9-506 | LG |
These positions are not standard. Contact Joyce/Dayton with your requirements. |
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LS9-507 | LH |
Model | Capacity | Screw Diameter (mm) | Thread Pitch/Lead | Worm Gear Ratio | Worm Shaft Turns for 1mm Travel | Tare Torque (Nm) | Starting Torque (Nm) | Operating Torque (Nm) | Efficiency Rating % Approx | Screw Torque (Nm) | Basic Jack Weight (Kg) | Jack Weight (Kg) per 25mm Travel |
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MWJ51 | 10 kN | 20 | 5mm | 5:1 | 1 | 0.33 | .95W* | .70W* @ 500 RPM |
22.7 | 2W* | 2.7 | 0.14 |
MWJ201 | 10 kN | 20 | 5mm | 20:1 | 4 | 0.33 | .41W* | .23W* @ 500 RPM |
17.0 | 2W* | 2.7 | 0.14 |
MWJ62.5 | 25 kN | 30 | 6mm | 6:1 | 1 | 0.67 | 1.01W* | .81W* @ 500 RPM |
19.6 | 3W* | 6.8 | 0.18 |
MWJ122.5 | 25 kN | 30 | 6mm | 12:1 | 2 | 0.67 | .62W* | .45W* @ 500 RPM |
17.8 | 3W* | 6.8 | 0.18 |
MWJ242.5 | 25 kN | 30 | 6mm | 24:1 | 4 | 0.67 | .44W* | .27W* @ 500 RPM |
14.7 | 3W* | 6.8 | 0.18 |
MWJ65 | 50 kN | 40 | 9mm | 6:1 | 0.67 | 1.13 | 1.64W* | 1.14W* @ 300 RPM |
20.9 | 4W* | 14.5 | 0.32 |
MWJ125 | 50 kN | 40 | 9mm | 12:1 | 1.33 | 1.13 | 1.03W* | .64W* @ 300 RPM |
18.7 | 4W* | 14.5 | 0.32 |
MWJ245 | 50 kN | 40 | 9mm | 24:1 | 2.67 | 1.13 | .74W* | .39W* @ 300 RPM |
15.2 | 4W* | 14.5 | 0.32 |
MWJ810 | 100 kN | 55 | 12mm | 8:1 | 0.67 | 2.26 | 1.53W* | 1.18W* @ 200 RPM |
20.2 | 5W* | 19.5 | 0.59 |
MWJ2410 | 100 kN | 55 | 12mm | 24:1 | 2 | 2.26 | .76W* | .49W* @ 200 RPM |
16.1 | 5W* | 19.5 | 0.59 |
*W: Load in kN.
Tare Torque: Initial torque to overcome seal and normal assembly drag. This value must be added to starting torque or operating torque values.
Starting Torque: Torque value required to start moving a given load (dissipates to operating torque values once the load begins moving).
Operating Torque: Torque required to continuously raise a given load at the input RPM listed. Note: If your actual input RPM is 20% higher or lower than the listed RPM, please refer to our JAX program to determine actual torque values at your RPM.
Screw Torque: Torque required to resist screw rotation (Translating Design Jacks) and traveling nut rotation (Keyed for Traveling Nut Design Jack).
Lead: The distance traveled axially in one rotation of the lifting screw.
Pitch: The distance from a point on a screw thread to a corresponding point on the next thread measured axially.