Metric Screw Jacks 25kN

MWJ62.5, MWJ122.5, MWH242.5

Joyce 25 kN metric screw jacks are specifically designed for applications that must be fully metric. Upright or inverted these jacks operate at full capacity in tension or compression and are available in Translating, Keyed for non-rotation, and KFTN designs. 

  • Self-locking 30mm diameter, 6 mm pitch trapezoidal lifting screw
  • Fully metric mounting hole locations, diameters, and fasteners
  • Joyce/Dayton can customize to your specifications
  • Housing is ductile iron
  • Lifting screw is cold drawn steel (CDS)
  • Input shaft (worm) is CDS
  • Internal wormgear is aluminum bronze
  • Traveling Nut (KFTN) is aluminum bronze

Sample Part Number:

Click on the part number to reveal additional informaton about jack designs and shaft codes.

Model Number

10 kN 25 kN 50 kN 100 kN
MWJ51
MWJ201
MWJ62.5
MWJ122.5
MWJ242.5
MWJ65
MWJ125
MWJ245
MWJ810
MWJ2410

Jack Configuration

U=Upright

I=Inverted

End Conditions

1=T1
(plain end)

2=T2
(load pad)

3=T3
(threaded end)

4=T4
(male clevis)

Jack Designs

S=Translating

K=Keyed for Non Rotation

N=Traveling Nut

D=Double Clevis

R=KFTN Trunnion*
T=Trunnion*

* Standard trunnion mounts available on 2-ton through 20-ton jacks.

Metric Screw Jack Rise

Rise is travel expressed in millimeters and not the actual screw length.

Left Side Shaft Code

Right Side Shaft Code

XXXX=Remove
STDX=Standard

XXXX=Remove
STDX=Standard

 


Optional Shaft Codes

Screw Stops and Boots

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.

Mechanical Counters

CNT0=0.001" Increments
Note: Contact Joyce/Dayton for availability and options.

Hand Wheels

HW04=4" dia
HW06=6" dia
HW08=8" dia
HW10=10" dia
HW12=12" dia

Geared Potentiometers

POTA=0-10V (IP65)
POTB=4-20MA (IP65)
POTC=0-10V w/2 switches*
POTD=4-20MA w/2 switches*
*Optional IP65 rating available

Encoders and Electronic Limit Switches

ENCX=Encoder
ELS2=2 Position Electronic Switch
ELS4=4 Position Electronic Switch
ELS6=6 Position Electronic Switch

Motor for Systems and Direct Drive

  • All standard motors are 3-phase, 208-230/460 VAC or 230/460 VAC. Other motor options are available. Specify the appropriate motor size from the chart on the right.
  • Refer to the "Additional Options" chart on the preceding page as needed.
  • Brake motors (M2) are recommended for jacks that are not self-locking, and jacks with double lead screws.
  • If the motor frequency will be varied to provide a "soft" start an inverter duty motor may be required.

Motors

Size Code
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

Motor Mounts

Ordering Example:
MMA A (Motor code from chart above)

MMA=56C
MMB=140TC
MMC=180TC
MMD=210TC

Standard motor adapters are aluminum

Mechanical Limit Switches

Ordering Example:
LA (Models) 1(Number of DPDT Switches) 3(Available Positions)

Model Code   Available Positions
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
LS8-504 LB
LS9-502 LC
LS9-503 LD Right Side Shaft Options
LS9-504 LE
LS9-505 LF
LS9-506 LG
  • 2, 3, 5, 10, 15, and 20 ton jacks are available with positions #1, #3, and #5
  • 25, 30, 35, 50, 75, 100, and 150 ton jacks are available with positions #1, #4, #7, and #8

These positions are not standard. Contact Joyce/Dayton with your requirements.

LS9-507 LH

Additional Options

  • X=Standard Jack, no additional options
  • S=Additional Specification Required (comment as necessary)

Anti-Backlash

  • A=Split Nut
  • A90=A90 Design
  • A95=A95 Design

Protective Boots

  • B=Protective Boot
  • D=Dual Protective Boot

Finishes

  • F1=Do Not Paint
  • F2=Epoxy Paint
  • F3=Outdoor Paint Process

Motor Options

  • M1=Less Motor
  • M2=Brake Motor
  • M3=Single Phase Motor (120VAC)
  • M4=50Hz Motor

Grease/Seals

  • H1=High Temperature Operation
  • H2=Food Grade

Screw Stops

  • ST0=Extending
  • ST1=Retracting
  • ST2=Both
  • Specify as many options as needed
ModelCapacityScrew Diameter (mm)Thread Pitch/LeadWorm Gear RatioWorm Shaft Turns for 1mm TravelTare Torque (Nm)Starting Torque (Nm)Operating Torque (Nm)Efficiency Rating % ApproxScrew Torque (Nm)Basic Jack Weight (Kg)Jack Weight 
(Kg) per 25mm Travel
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

 

*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. 

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