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Joyce - Model WJ250 -Machine Screw Jacks
Joyce WJ250 miniature wormgear machine screw jacks with 5:1 gear set ratios lift and precisely position up to 250 pounds. Upright or inverted, these self-locking jacks operate at full capacity in tension or compression and are available in Translating and KFTN designs.
- 5/8” diameter lifting screw
- Standard lead, 0.125” Stub Acme
- Screw material – 304 Stainless Steel
- Self-locking
- Hand wheels are available for manual operation
These jacks can be attached to small foot mounted motors with Couplings for powered operation.
When a motor mount is needed consider Integrated Actuators, which include a 56C motor mount on the actuator housing.
- Aluminum housing and protection tube
- Lifting screw, cold drawn steel (CDS)
- Input shaft (worm), 416 stainless steel
Product Specifications
Note: Optional hand wheels are available but, due to the housing design, it is not possible to mount a motor, encoder, potentiometer, or counter directly to the jack housing. When a motor mount is needed consider Integrated Actuators, which include a 56C motor mount on the actuator housing.
*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.