- Right hand thread standard
- Left hand thread available on many models
- Special pitch/lead available
- Special finishes available
- Special machining options
1-800-523-5204 or 1-937-294-6261
Joyce worm gear ball screw jacks lift and precisely position loads up to 50-tons. Upright or inverted jacks operate at full capacity in tension or compression. Select from standard lead (WB, WBL) and high lead (HWB, HWBL) models to meet your travel speed and ball nut life requirements. These ball screw jacks require up to two-thirds less input torque to move the load than similarly rated machine screw jacks. They require a brake motor or external locking device to hold position.
Parts list and exploded views are included in the O&M Manual. Serial numbers are attached to the product housing.
![]() Ball Screw Options
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![]() Encoders
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![]() Finishes
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![]() Input Shaft (worm)
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![]() Limit Switches
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![]() Lubrication
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![]() Motor Mounts
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![]() Oversized Ball Bearings
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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.
1-Ton Standard | 2-Ton Standard | 2-Ton Reverse Base Standard | 5-Ton Standard | 10-Ton Standard | 10-Ton Heavy Duty | 20-Ton Standard | 30-Ton Standard | 50-Ton Standard |
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WBL51 WBL201 |
WB62 WB122 WB242 |
RWB62 RWB122 RWB242 |
WB65 WB125 WB245 |
WBL810 WBL2410 |
WB810 WB2410 |
WB820 WB2420 |
WB1130 WB3230 |
WB1150 WB3250 |
1-Ton Heavy Duty | 2-Ton High Lead | 2-Ton Reverse Base High Lead | 5-Ton High Lead | 10-Ton Standard High Lead | 10-Ton Heavy Duty High Lead | 50-Ton Reverse Base | ||
WB51 WB201 |
HWB62 HWB122 HWB242 |
RHWB62 RHWB122 RHWB242 |
HWB65 HWB125 HWB245 |
HWBL810 HWBL2410 |
HWB810 HWB2410 |
RWB1150 RWB3250 |
Important Note: *Not self-locking, may lower under load. Brake motors or external locking systems are required.
H: indicates High lead (2-ton, 5-ton and 10-ton only).
R: Reverse Base Jack (2-ton and 50-ton only).
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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.
**Keyed for non-rotation is not a standard option. Contact Joyce/Dayton with your requirements.
Rise is travel expressed in inches and not the actual screw length.
Left Side Shaft Code |
Right Side Shaft Code |
XXXX=Remove |
XXXX=Remove |
Screw stops are optional on ball screw jacks. When specified, the closed height of the jack and/or the protection tube length may be increased. When boots are added to ball screw jacks, the closed height of the jack may be increased.
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 (inches) | Thread Pitch/ Lead | Worm Gear Ratio | Worm Shaft Turns for 1" Travel | Tare Torque (Inches Lbs.) | Starting Torque (Inches Lbs.) | Operating Torque (Inches Lbs.) | Efficiency Rating % Approx | Screw Torque (Inches Lbs.) | Worm Holding (Inch Lbs.) | Ball Nut Life at Rated Load (Inch Screw Travel x 1000) | Basic Jack Weight (Lbs.) | Jack Weight per Inch Travel (Lbs.) |
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WBL51 | 1 ton | 3/4 | 0.2 | 5:1 | 25 | 3 | .014W* | .012W* @ 500 RPM |
51.7 | .035W* | .006W* | 108 | 8 | 0.25 |
WBL201 | 1 ton | 3/4 | 0.2 | 20:1 | 100 | 3 | .005W* | .004W* @ 500 RPM |
38.5 | .035W* | .002W* | 108 | 8 | 0.25 |
WB51 | 1 ton | 3/4 | 0.2 | 5:1 | 25 | 3 | .014W* | .012W* @ 500 RPM |
51.7 | .035W* | .006W* | 858 | 8 | 0.25 |
WB201 | 1 ton | 3/4 | 0.2 | 20:1 | 100 | 3 | .005W* | .004W* @ 500 RPM |
38.5 | .035W* | .002W* | 858 | 8 | 0.25 |
(R)WB62 | 2 ton | 1 | 0.25 | 6:1 | 24 | 4 | .015W* | .013W* @ 500 RPM |
52.1 | .044W* | .007W* | 642 | 18 | 0.4 |
(R)WB122 | 2 ton | 1 | 0.25 | 12:1 | 48 | 4 | .009W* | .007W* @ 500 RPM |
47.2 | .044W* | .004W* | 642 | 18 | 0.4 |
(R)WB242 | 2 ton | 1 | 0.25 | 24:1 | 96 | 4 | .006W* | .004W* @ 500 RPM |
39.3 | .044W* | .002W* | 642 | 18 | 0.4 |
(R)HWB62 | 2 ton | 1 | 1 | 6:1 | 6 | 4 | .064W* | .051W* @ 500 RPM |
52.1 | .177W* | .020W* | 190 | 18 | 0.4 |
(R)HWB122 | 2 ton | 1 | 1 | 12:1 | 12 | 4 | .041W* | .028W* @ 500 RPM |
47.2 | .177W* | .020W* | 190 | 18 | 0.4 |
(R)HWB242 | 2 ton | 1 | 1 | 24:1 | 24 | 4 | .028W* | .017W* @ 500 RPM |
39.3 | .177W* | .014W* | 190 | 18 | 0.4 |
WB65 | 5 ton | 1 1/2 | 0.474 | 6:1 | 12.66 | 10 | .030W* | .025W* @ 300 RPM |
51.1 | .084W* | .013W* | 1015 | 42 | 0.7 |
WB125 | 5 ton | 1 1/2 | 0.474 | 12:1 | 25.33 | 10 | .019W* | .014W* @ 300 RPM |
45.7 | .084W* | .007W* | 1015 | 42 | 0.7 |
WB245 | 5 ton | 1 1/2 | 0.474 | 24:1 | 50.66 | 10 | .013W* | .008W* @ 300 RPM |
37.2 | .084W* | .004W* | 1015 | 42 | 0.7 |
HB65 | 5 ton | 1 1/2 | 1.0 | 6:1 | 6 | 10 | .065W* | .052W* @ 300 RPM |
51.1 | .177W* | .033W* | 512 | 42 | 0.7 |
HB125 | 5 ton | 1 1/2 | 1.0 | 12:1 | 12 | 10 | .041W* | .029W* @ 300 RPM |
45.7 | .177W* | .020W* | 512 | 42 | 0.7 |
HB245 | 5 ton | 1 1/2 | 1.0 | 24:1 | 24 | 10 | .029W* | .018W* @ 300 RPM |
37.2 | .177W* | .014W* | 512 | 42 | 0.7 |
WBL810 | 10 ton | 1 1/2 | 0.474 | 8:1 | 16.88 | 20 | .022W* | .019W* @ 200 RPM |
50.7 | .084W* | .010W* | 127 | 58 | 0.9 |
WBL2410 | 10 ton | 1 1/2 | 0.474 | 24:1 | 50.66 | 20 | .010W* | .008W* @ 200 RPM |
40.3 | .084W* | .004W* | 127 | 58 | 0.9 |
HWBL810 | 10 ton | 1 1/2 | 1.0 | 8:1 | 8 | 20 | .047W* | .039W* @ 200 RPM |
50.7 | .177W* | .024W* | 64 | 58 | 0.9 |
HWBL2410 | 10 ton | 1 1/2 | 1.0 | 24:1 | 24 | 20 | .024W* | .016W* @ 200 RPM |
40.3 | .177W* | .012W* | 64 | 58 | 0.9 |
WB810 | 10 ton | 2 | 0.5 | 8:1 | 16 | 20 | .023W* | .019W* @ 200 RPM |
50.7 | .088W* | .009W* | 729 | 62 | 1.4 |
WB2410 | 10 ton | 2 | 0.5 | 24:1 | 48 | 20 | .011W* | .008W* @ 200 RPM |
40.3 | .088W* | .003W* | 729 | 62 | 1.4 |
HWB810 | 10 ton | 2 | 1.0 | 8:1 | 8 | 20 | .047W* | .039W* @ 200 RPM |
50.7 | .177W* | .018W* | 1423 | 62 | 1.4 |
HWB2410 | 10 ton | 2 | 1.0 | 24:1 | 24 | 20 | .023W* | .016W* @ 200 RPM |
40.3 | .177W* | .006W* | 1423 | 62 | 1.4 |
WB820 | 20 ton | 2 1/4 | 0.5 | 8:1 | 16 | 40 | .024W* | .020W* @ 200 RPM |
47.4 | .088W* | .009W* | 121 | 105 | 2.6 |
WB2420 | 20 ton | 2 1/4 | 0.5 | 24:1 | 48 | 40 | .012W* | .009W* @ 200 RPM |
35 | .088W* | .003W* | 121 | 105 | 2.6 |
WB1130 | 30 ton | 3 | 0.66 | 11:1 | 16.67 | 60 | .027W* | .020W* @ 200 RPM |
48 | .117W* | .009W* | 343 | 220 | 3.2 |
WB3230 | 30 ton | 3 | 0.66 | 32:1 | 48.48 | 60 | .016W* | .009W* @ 200 RPM |
35 | .117W* | .003W* | 343 | 220 | 3.2 |
(R)WB1150 | 50 ton | 4 | 1.0 | 11:1 | 11 | 100 | .038W* | .029W* @ 200 RPM |
49.3 | .117W* | .013W* | 614 | 460 | 4.8 |
(R)WB3250 | 50 ton | 4 | 1.0 | 32:1 | 32 | 100 | .020W* | .012W* @ 200 RPM |
37.5 | .117W* | .005W* | 614 | 460 | 4.8 |
Important Note: Ball Screw Jacks are not self-locking. Brake motors or external locking systems are required.
(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).
Worm Holding Torque: Torque required to prevent input shaft (worm) from backdriving.
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.
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.
Boots and special finishes are available for Joyce Ball Screw Jacks. Choose from a variety of boot materials and designs for the jacks you select (translating or KFTN). Joyce offers premium finishes, outdoor paint process, and custom finishes to meet your specifications. We have a hassle-free process for delivering what you need.
What you need to know to specify ball screw jacks in industrial applications
Ball Screw Jacks are rated based on their static thrust capacity from 1-ton to 50-tons. But the selection of the best jack for the application requires further consideration.
Once loads, duty cycles, and travel speeds are established, designers must select which jack design to use.
Special features inherent in wormgear ball screw jacks.
Ball screw jacks include ball nuts that are about 90% efficient so the jacks require much less energy to lift an equal load than their machine screw jack counterpart. They are NOT self-locking so a brake motor needs to be included in the drive system and hand wheels are not a recommended option.
Take the work out of using screw jacks in systems
Joyce/Dayton screw jacks and lifting systems offer wide-ranging lifting and positioning solutions for diverse industries. Our robust jacks reliably move and accurately position loads up to 250-tons. Joyce configures jacks with components such as motors, gear reducers, shafting, coupling, and motion control devices to create complete multi-jack systems.
Tell us what you need or use our exclusive JAX® Online software (it’s free). We will put together complete systems with single or multiple screw jacks for you. The software is great because it calculates motor horsepower and shaft diameters and torques. There are several common arrangements, but the program is flexible and allows you to design what you need.
Where are worm gear ball screw jacks used?
Worm gear ball screw jacks are fast and efficient. They can accurately position and hold loads up to 50-tons. Examples include: Platform lifts, Damper adjustments, Ergonomic lifts, Maintenance lifts, Roll adjustments, Earth Station Antennas, Solar Trackers, Conveyor adjustments, Packaging equipment, and Gate adjustments.