250 Ton Machine Screw Jacks

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250 Ton Machine Screw Jacks

WJ50250

Joyce WJ50250 worm gear machine screw jacks with 50:1 gear set ratios lift and precisely position up to 250-tons. Upright or inverted, these jacks self-locking jacks operate at full capacity in tension or compression.

  • 9” diameter lifting screw
  • Available in a 50:1 ratio 
  • Single lead -  1.00” lead,  ACME 2C
  • Screw material – Cold Drawn Steel (CDS)
  • These large jacks are custom built to your specific application
  • Contact Joyce/Dayton with your requirements

2D/3D Drawings

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Product Media

2D/3D DRAWINGSO & MANUAL PRODUCT INFORMATION ORDERING INFORMATION TRANSLATING KEYED TYPICAL PLAN VIEW COLUMN LOAD CHART
jack

Available Models

250 LBS. 500 LBS. 1,000 LBS. 1 TON 2 TON 2 TON REVERSE BASE 3 TON 5 TON 10 TON 15 TON 20 TON 25 TON 30 TON 50 TON 50 TON REVERSE BASE 75 TON 100 TON 150 TON 250 TON
  • Steel housing
  • Lifting screw, cold drawn steel (CDS)
  • Input shaft (worm), CDS
  • Aluminum Bronze internal wormgear
  • Aluminum bronze traveling Nut (KFTN)

Sample Part Number:

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

Model Number

Miniature 1-Ton 2-Ton 2-Ton Reverse Base 3-Ton 5-Ton 10-Ton 15-Ton 20-Ton
WJ250
WJ500*
WJ1000		 WJ51
WJ201		 WJT62
WJT122
WJT242
WJT252		 RWJT62
RWJT122
RWJT242
RWJT252		 WJ63
WJ123
WJ243
WJ253		 WJT65
WJT125
WJT245
WJT255		 WJ810
WJ2410
WJ2510		 WJ815
WJ2415
WJ2515		 WJ820
WJ2420
WJ2520
    DWJ62*
DWJ122*
DWJ242*		 DRWJ62*
DRWJ122*
DRWJ242*		 DWJ63*
DWJ123*
DWJ243*		 DWJ65*
DWJ125*
DWJ245*		 DWJ810*
DWJ2410*		 DWJ815*
DWJ2415*		 DWJ820*
DWJ2420*
25-Ton 30-Ton 35-Ton 50-Ton 50-Ton Reverse Base 75-Ton 100-Ton 150-Ton 250-Ton
WJ1125
WJ3225		 WJ1130
WJ3230		 WJ1135
WJ3235		 WJT1150
WJT3250		 RWJT1150
RWJT3250		 WJ1175
WJ3275		 WJ12100
WJ36100		 WJ12150
WJ36150		 WJ50250
DWJ1125*
DWJ3225*		 DWJ1130*
DWJ3230*		              

Important Note: *Not self-locking, may lower under load. Brake motors or external locking systems are recommended.
D: Double Lead Screw
R: Reverse Base Jack, (only available on 2-ton and 50-ton jacks).

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.

Machine Screw Jack Rise

Rise is travel expressed in inches 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 machine screw jacks. When specified, the closed height of the jack and/or the protection tube length may be increased. When boots are added to machine 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 Liit Switches

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

Motor for Systems and Direct Drives

  • 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
MODEL SCRW DIAM (INCH) THRD PITCH/ LEAD WORM GEAR RATIO WORM SHAFT TURNS FOR 1" TRAVEL TARE TORQUE (INCH LBS.) STARTING TORQUE (INCH LBS.) OPERATING TORQUE (INCH LBS.) EFFICIENCY
RATING % APPROX.		 SCREW TORQUE (INCH LBS.) BASIC JACK WEIGHT (LBS). JACK WEIGHT PER INCH TRAVEL (LBS.)
WJ50250 9 1.00 pitch
ACME 2C		 50:1 50 500 Contact Joyce .036W* @ 60 RPM 8.8 .711W* 3415 21.0

Important Note: Series DWJ double lead screw jacks are not self-locking. Brake motors or external locking systems are recommended.
(R): Reverse Base Jack.
*W: Load in pounds.
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 Jacks).
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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