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    AI Overview
    Acme Screw Jacks-- Professional Manufacturer
    Acme jack screws with lock nuts are designed for precise positioning, heavy-load lifting, and self-locking capabilities to maintain stability under load, featuring robust trapezoidal threads. These screws are frequently paired with specialized nuts—such as anti-backlash brass nuts for high precision or heavy-duty steel nuts. 
    Key Components and Features 
    • Acme Thread Screw: Typically made from stainless steel (e.g., 304) for durability and corrosion resistance.
    • Anti-Backlash Nut: These often consist of a three-part system (front nut, spring, rear nut) that self-compensates for wear, keeping tight tolerances.
    • Locking Mechanism: Used to secure the jack in place, providing a "self-locking" function, which is critical for safety in vertical lifting applications.
    • Material: Often brass or bronze for the nut to reduce friction with the steel screw. 
    Common Applications 
    • Industrial Jacks: Used in machinery, construction, and lifting equipment.
    • 3D Printing/CNC: Used in precision motion control (e.g., 8mm T8x2 lead screws).
    • Custom Fabrication: Used in adjustable stands. 
    Procurement Options 
    • Small-Scale/Precision: eBay - zyltech offers 8mm T8x2 stainless steel lead screws with anti-backlash brass nuts, priced around $14–$19.
    • Industrial/Heavy-Duty: Duff-Norton or Joyce-Dayton provide heavy-duty screw jacks with options for locking mechanisms.
    • Replacement Parts: zumasales.com sells specific replacements like the JLG Part # 2840016 for approximately $423. 
    Maintenance 
    • Lubrication: Acme screws require lubrication (e.g., white lithium grease) for smooth operation, particularly when used in high-load scenarios. 
    • Building Acme Screw Jack Stands for Fabrication
      Aug 17, 2024 — today we're building some jack stands with an Acme screw. so you can adjust the height. and push on things a little bit and I'm go...
      11:29
      YouTube·TimWelds
    • Acme nut, Acme screw, and Anti-rotator Connection
      Mar 2, 2022 — hello in this video we're going to talk about the Acme screw that is used with 3D potter extruders as well as the Acme nut and the...
      3:40
      YouTube·3D Potter Tech Support
    • Acme Screw - Joyce-Dayton
      These self-locking, compact solar tracking jacks are designed to precisely position loads at speeds up to 3.75 inches per minute. ...
      joycedayton.com
    • Worm Gear ACME Screw Jacks 20ton - Lude Transmission
      ACME worm screw jacks are widely used, they are suitable for heavy load and low speed, and they have self-lock function. Trapezoid...
      www.ludetransmission.com
    • Acme Screw Jacks - Columbus McKinnon
      Acme thread screw jacks from Duff-Norton offer positive mechanical action, precise positioning, and uniform lifting speeds. Find t...
      www.cmco.com
    • Stainless Steel Screw Jack - Columbus McKinnon
      Features and Benefits * Capacity. From 2- to 100- tons. * Maximum Control. Anti-backlash models available. * Corrosion Resistance.
      www.cmco.com
    • Go to product viewer dialog for this item.
      8mm T8x2 Lead Screw Trapezoidal ACME w/ Anti-Backlash Nut kit 140 200 300 400
      Specifications: Length: 150 200 250 300 400 mm lead screw material: 304 stainless steel Right handed. Single start. 2 mm per turn ...
      Google
    • Go to product viewer dialog for this item.
      8mm T8x2 Lead Screw Trapezoidal ACME w/ Anti-Backlash Nut kit 140 200 300 400
      Specifications: Length: 150 200 250 300 400 mm lead screw material: 304 stainless steel Right handed. Single start. 2 mm per turn ...
      Google
    • Go to product viewer dialog for this item.
      JLG Part # 2840016 - JACK, (SCREW ACME)
      JLG Part 2840016 For Sale JACK, (SCREW ACME) Most parts ship out within the first 24 hours of order | Delivery average is 3-7 days...
      Google
    • Building Acme Screw Jack Stands for Fabrication
      Aug 17, 2024 — today we're building some jack stands with an Acme screw. so you can adjust the height. and push on things a little bit and I'm go...
      11:29
      YouTube·TimWelds
    • Acme nut, Acme screw, and Anti-rotator Connection
      Mar 2, 2022 — hello in this video we're going to talk about the Acme screw that is used with 3D potter extruders as well as the Acme nut and the...
      3:40
      YouTube·3D Potter Tech Support
    • Acme Screw - Joyce-Dayton
      These self-locking, compact solar tracking jacks are designed to precisely position loads at speeds up to 3.75 inches per minute. ...
      joycedayton.com
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    acme jack screw with lock nut


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    People also ask
    What is a self-locking screw jack?
    A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed. This occurs when the frictional force direction reverses, and the reaction force acts on the other side of the thread's normal.Sep 22, 2023

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    What are the three types of screw jacks?
    SCREW JACKS DO THE HEAVY LIFTING - Candy Controls
    There are 3 main types of screw jacks: machine/worm gear screw jacks, ball screw jacks, and bevel gear jacks. Within these, there are 3 subcategories related to the mode of operation: Translating, Keyed, and Rotating/Traveling nut.May 29, 2019

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    How does an acme screw jack work?
    Acme screws use trapezoidal threads to roll onto the lead screw. As the shaft rotates and the rotary motor turns, the threads push the shaft nut forward or backward depending on the direction of the rotating motion. This transfers the circular force of the motor into linear motion on the shaft.

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    What is true in respect of the self-locking screw jack with square thread?
    For a screw jack with square threads to be self-locking: Friction angle (φ) must be greater than the helix angle (α). This ensures that the screw does not rotate backward under the load when effort is removed.

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