Machine Screw Jacks

Joyce worm gear machine screw jacks lift and precisely position loads (250 pounds to 250 tons). Upright or inverted jacks operate at full capacity in tension or compression. WJ and RWJ, single lead jacks are self-locking. DWJ and DRWJ, double lead jacks offer increased travel speed and require a brake or external locking device to hold position.

  • Alloy steel input shafts
  • Aluminum bronze wormgears
  • Tapered or ball thrust bearings provide rugged reliability
  • Double input shafts standard
  • Choose one of four standard end conditions
  • Protective boots available
  • Anti-backlash devices available
  • Joyce/Dayton can customize mechanical jacks to your specifications

wormgear jack cut away illustration

Parts list and exploded views are included in the O&M Manual. The serial number is attached to the product housing.

Anti-backlash Devices

  • Available for machine screw jacks
  • Available for metric (trapezoidal) jacks
  • Limits lifting screw movement
  • Anti-backlash Devices

     

 

Encoders

  • Standard 200 PPR, quadrature mount on input shaft

OR

  • Ring Style 60 PPR, quadrature mounts to C-faced motor flange
  • Encoders

    

Finishes

  • Enamel finish (standard)
  • Epoxy finish
  • Epoxy finish – Steel It epoxy
  • Outdoor paint process
  • Custom finishes available
  • Anodized (250-lb to 1-ton)
  • Nickel, Xylan®, Armoloy®
  •  Finishes

  

   

Follower Nuts

  • For KFTN jack
  • For translating jack

Hand Wheels

  • 4" – 12" dia. (standard)
  • Aluminum (standard)
  • Stainless steel available
  •  Hand Wheels

   

Input Shaft (worm)

  • Square or hex to fit tool
  • Special lengths
  • 17-4 stainless steel available
  • Metric diameters available
  • One side can be cut off
  • Other modifications available
  • Input shaft cover available

Limit Switches

  • Rotary cam (2-7 switches)
  • SPDT standard
  • DPDT available
  • Explosion proof available
  • Limit Switches

  

Lubrication

  • Standard operating (40°F to 220°F)
  • Low temperature option
  • High temperature option
  • Food grade option

Machine Screws

  • Right hand thread standard
  • Left hand thread available on many models
  • Special material available
  • Special pitch/lead available
  • Special finishes available
  • Special machining options
  • Special end conditions available

Mechanical Counters

   

Motor Mounts

  • Available on 2-ton to 20-ton wormgear jacks and electric cylinders
  • Included on integrated actuators
  • NEMA motor mounts
  • Special mounts available
  • Motor Mounts and Stock Motors

   

Potentiometers

  • 0-10V (POTA)
  • 4-20mA (POTB)
  • 0-10V with limit switches (POTC)
  • 4-20mA with limit switches(POTD)
  • IP65 available
  • Potentiometers

   

Protective Boots

  • Protection from dirt and dust
  • Guard against moisture
  • Guard against corrosive contaminants
  • Neoprene coated nylon (std)
  • Special materials available
  • Boot Material Chart
  • Protective Boots

Screw Stops

  • Standard on ComDRIVEs
  • Adjustable
  • Bolt- on

Thrust Rings

  • Used in applications where static loads exceed jack capacity

Wormgear Sets

  • Right hand gear set standard
  • Left hand available on many models
  • 25:1 ratio option available on several models

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
MODELCPTYSCRW DIAM (INCH)THRD PITCH/ LEADWORM GEAR RATIOWORM SHAFT TURNS FOR 1" TRAVELTARE 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.)
WJ250 250 lbs. 1/2 .125 pitch
STUB ACME
5:1 40 1 .025W* .018W* @ 500 RPM 23.0 .050W* 1.2 0.1
WJ500 500 lbs. 5/8 .125 pitch/.250 lead
STUB ACME
5:1 20 1 .041W* .030W* @ 500 RPM 27.2 .079W* 1.3 0.1
WJ1000 1,000 lbs. 5/8 .125 pitch
STUB ACME
5:1 40 1 .030W* .021W* @ 500 RPM 19.9 .059W* 1.3 0.1
WJ51 1 ton 3/4 .200 pitch
ACME 2C
5:1 25 3 .038W* .026W* @ 500 RPM 25 .075W* 6 0.3
WJ201 1 ton 3/4 .200 pitch
ACME 2C
20:1 100 3 .017W* .009W* @ 500 RPM 15.9 .075W* 6 0.3
(R)WJT62 2 ton 1 .250 pitch
ACME 2C
6:1 24 4 .041W* .028W* @ 500 RPM 24.2 .098W* 15 0.3
(R)WJT122 2 ton 1 .250 pitch
ACME 2C
12:1 48 4 .025W* .015W* @ 500 RPM 22.0 .098W* 15 0.3
(R)WJT242 2 ton 1 .250 pitch
ACME 2C
24:1 96 4 .018W* .009W* @ 500 RPM 18.3 .098W* 15 0.3
(R)WJT252 2 ton 1 .250 pitch
ACME 2C
25:1 100 4 .015W* .0085W* @ 500 RPM 17.0 .098W* 15 0.3
D(R)WJ62 2 ton 1 .250 pitch
.500 lead
ACME 2C
6:1 12 4 .057W* .039W* @ 500 RPM 33.7 .139W* 15 0.3
D(R)WJ122 2 ton 1 .250 pitch
.500 lead
ACME 2C
12:1 24 4 .035W* .022W* @ 500 RPM 30.5 .139W* 15 0.3
D(R)WJ242 2 ton 1 .250 pitch
.500 lead
ACME 2C
24:1 48 4 .025W* .013W* @ 500 RPM 25.4 .139W* 15 0.3
WJ63 3 ton 1 .250 pitch
ACME 2C
6:1 24 6 .040W* .029W* @ 500 RPM 24.3 .098W* 17 0.4
WJ123 3 ton 1 .250 pitch
ACME 2C
12:1 48 6 .025W* .016W* @ 500 RPM 22.2 .098W* 17 0.4
WJ243 3 ton 1 .250 pitch
ACME 2C
24:1 96 6 .017W* .009W* @ 500 RPM 18.5 .098W* 17 0.4
WJ253 3 ton 1 .250 pitch
ACME 2C
25:1 100 6 .0155W* .009W* @ 500 RPM 17.8 .098W* 17 0.4
DWJ63 3 ton 1 .250 pitch
.500 lead
ACME 2C
6:1 12 6 .055W* .041W* @ 500 RPM 33.8 .139W* 17 0.4
DWJ123 3 ton 1 .250 pitch
.500 lead
ACME 2C
12:1 24 6 .034W* .022W* @ 500 RPM 30.7 .139W* 17 0.4
DWJ243 3 ton 1 .250 pitch
.500 lead
ACME 2C
24:1 48 6 .024W* .013W* @ 500 RPM 25.6 .139W* 17 0.4
WJT65 5 ton 1 ½ .375 pitch
STUB
ACME
6:1 16 10 .065W* .044W* @ 300 RPM 23.0 .151W* 32 0.7
WJT125 5 ton 1 ½ .375 pitch
STUB
ACME
12:1 32 10 .041W* .025W* @ 300 RPM 20.6 .151W* 32 0.7
WJT245 5 ton 1 ½ .375 pitch
STUB
ACME
24:1 64 10 .029W* .015W* @ 300 RPM 16.7 .151W* 32 0.7
WJT255 5 ton 1 ½ .250 pitch
ACME 2C
25:1 100 10 .022W* .011W* @ 300 RPM 13.4 .131W* 32 0.7
DWJ65 5 ton 1 ½ .250 pitch
.500 lead
ACME 2C
6:1 12 10 .072W* .050W* @ 300 RPM 26.8 .171W* 32 0.7
DWJ125 5 ton 1 ½ .250 pitch
.500 lead
ACME 2C
12:1 24 10 .045W* .028W* @ 300 RPM 23.9 .171W* 32 0.7
DWJ245 5 ton 1 ½ .250 pitch
.500 lead
ACME 2C
24:1 48 10 .033W* .017W* @ 300 RPM 19.6 .171W* 32 0.7
WJ810 10 ton 2 .500 pitch
ACME 2C
8:1 16 20 .061W* .043W* @ 200 RPM 23.1 .195W* 43 1.3
WJ2410 10 ton 2 .500 pitch
ACME 2C
24:1 48 20 .030W* .018W* @ 200 RPM 18.8 .195W* 43 1.3
WJ2510 10 ton 2 .250 pitch
ACME 2C
25:1 100 20 .024W* .014W* @ 200 RPM 11.3 .161W* 43 1.3
DWJ810 10 ton 2 .333 pitch
.666 lead ACME 2C
8:1 12 20 .070W* .062W* @ 200 RPM 31.9 .228W* 43 1.3
DWJ2410 10 ton 2 .333 pitch
.666 lead ACME 2C
24:1 36 20 .035W* .026W* @ 200 RPM 25.9 .228W* 43 1.3
WJ815 15 ton 2 ¼ .500 pitch
ACME 2C
8:1 16 30 .069W* .047W* @ 200 RPM 21.1 .210W* 59 1.4
WJ2415 15 ton 2 ¼ .500 pitch
ACME 2C
24:1 48 30 .036W* .020W* @ 200 RPM 16.6 .210W* 59 1.4
WJ2515 15 ton 2 ¼ .250 pitch
ACME 2C
25:1 100 30 .026W* .015W* @ 200 RPM 10.2 .178W* 59 1.4
DWJ815 15 ton 2 ¼ .333 pitch
.666 lead ACME 2C
8:1 12 30 .079W* .058W* @ 200 RPM 34.4 .244W* 59 1.4
DWJ2415 15 ton 2 ¼ .333 pitch
.666 lead ACME 2C
24:1 36 30 .041W* .025W* @ 200 RPM 27.0 .244W* 59 1.4
WJ820 20 ton 2 ½ .500 pitch
ACME 2C
8:1 16 40 .075W* .051W* @ 200 RPM 19.6 .227W* 77 1.9
WJ2420 20 ton 2 ½ .500 pitch
ACME 2C
24:1 48 40 .039W* .022W* @ 200 RPM 15.4 .227W* 77 1.9
WJ2520 20 ton 2 ½ .250 pitch
ACME 2C
25:1 100 40 .029W* .016W* @ 200 RPM 9.4 .194W* 77 1.9
DWJ820 20 ton 2 ½ .375 pitch
.750 lead ACME 2C
8:1 10.67 40 .088W* .061W* @ 200 RPM 24.5 .272W* 77 1.9
DWJ2420 20 ton 2 ½ .375 pitch
.750 lead ACME 2C
24:1 32 40 .046W* .026W* @ 200 RPM 19.3 .272W* 77 1.9
WJ1125 25 ton 3 ⅜ .666 pitch STUB 
ACME
11:1 16 50 .088W* .055W* @ 200 RPM 18.3 .313W* 164 3.1
WJ3225 25 ton 3 ⅜ .666 pitch STUB 
ACME
32:1 48 50 .053W* .025W* @ 200 RPM 13.5 .313W* 164 3.1
DWJ1125 25 ton 3 ⅜ .562 pitch 1.125 lead
ACME 2C
11:1 9.5 50 .106W* .067W* @ 200 RPM 25.1 .384W* 164 3.1
DWJ3225 25 ton 3 ⅜ .562 pitch 1.125 lead
ACME 2C
32:1 28.5 50 .063W* .030W* @ 200 RPM 18.6 .384W* 164 3.1
WJ1130 30 ton 3 ½ .666 pitch
ACME 2C
11:1 16 60 .088W* .055W* @ 200 RPM 18.3 .313W* 164 3.0
WJ3230 30 ton 3 ½ .666 pitch
ACME 2C
32:1 48 60 .052W* .025W* @ 200 RPM 13.5 .313W* 164 3.0
DWJ1130 30 ton 3 ½ .5625 pitch 1.125 lead
ACME 2C
11:1 9.5 60 .107W* .067W* @ 200 RPM 25.1 .384W* 164 3.0
DWJ3230 30 ton 3 ½ .5625 pitch 1.125 lead
ACME 2C
32:1 28.5 60 .064W* .030W* @ 200 RPM 18.6 .384W* 164 3.0
WJ1135 35 ton 3 ¾ .666 pitch
ACME 2C
11:1 16 70 .093W* .057W* @ 200 RPM 17.4 .328W* 240 3.4
WJ3235 35 ton 3 ¾ .666 pitch
ACME 2C
32:1 48 70 .055W* .026W* @ 200 RPM 12.9 .328W* 240 3.4
(R)WJT1150 50 ton 4 ½ .666 pitch
ACME 2C
11:1 16 100 .095W* .063W* @ 150 RPM 15.8 .378W* 387 6.1
(R)WJT3250 50 ton 4 ½ .666 pitch
ACME 2C
32:1 48 100 .050W* .027W* @ 150 RPM 12.4 .378W* 387 6.1
WJ1175 75 ton 5 .666 pitch
ACME 2C
11:1 16 155 .107W* .067W* @ 150 RPM 14.8 .418W* 610 6.5
WJ3275 75 ton 5 .666 pitch
ACME 2C
32:1 48 155 .056W* .028W* @ 150 RPM 11.7 .418W* 610 6.5
WJ12100 100 ton 6 .750 pitch
ACME 2C
12:1 16 205 .112W* .072W* @ 90 RPM 13.9 .495W* 1010 10.0
WJ36100 100 ton 6 .750 pitch
ACME 2C
36:1 48 205 .059W* .031W* @ 90 RPM 10.8 .495W* 1010 10.0
WJ12150 150 ton 7 1.00 pitch
ACME 2C
12:1 12 300 .134W* .084W* @ 90 RPM 15.7 .595W* 1350 12.2
WJ36150 150 ton 7 1.00 pitch
ACME 2C
36:1 36 300 .070W* .037W* @ 90 RPM 12.1 .595W* 1350 12.2
WJ50250 250 ton 9 1.00 pitch
ACME 2C
50:1 50 500   .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.