Tension Nut

(9 reviews) Write a Review
  • OpenBuilds® Tension Nut  3025
  • OpenBuilds® Tension Nut  3025
  • OpenBuilds® Tension Nut  3025


This is a brass tension nut that will allow you to apply tension or simply hold in place the OpenBuilds custom lead screws.  It has an M5 set screw to ensure a no slip lock when set in the desired position. Learn more on how to use the tension system with our Tension based actuators


  • Strong brass construction
  • Easy and Fast installation
  • Compatible with our customized 8mm Metric Acme Lead Screws

What is Included

  • (1) Tension Nut
  • (1) Steel Set Screw

Product Specifications

  • OD: 13mm Hex nut
  • Thread: Tr8*8 (compatible with our customized 8mm Metric Acme Lead Screws)
  • Material:  Brass/ Steel set screw

Assembly/Support/Documentation/3D Models

Easy follow along assembly video – top notch awesome community support – open source files and documentation and examples.

Support CAD Files

This design or build includes OpenBuilds®, LLC design work(s) shared Open Source under the CC BY-SA 4.0 License Terms and Conditions

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9 Reviews

  • 5

    Posted by Scott Hunter on Feb 6th 2024

    This nut makes for a more accurate adjustment on the acme rod.

  • 4
    Works great

    Posted by Anthony Navarro on May 3rd 2023

    I would caution against over-tightening the set screw, but these work great for the 8mm lead screws.

  • 5
    Tension Nut

    Posted by Don on May 2nd 2023

    Great for adding tension to Acme thread rods. Helps remove whip on long rods.

  • 5
    Lead Screw Tension Nuts

    Posted by Bill Blades on Nov 8th 2022

    Love these! I was able to replace the 8mm shaft collars with these much more appropriate tension nuts to keep lead screw end play in check. Can't believe I didn't see these before, but I'm so glad to have them now! Very nice quality machining & fit with generous size set screw.

  • 5
    Went right on

    Posted by Matthew on Sep 28th 2022

    It went on great. I don't have a motor hooked to the other side yet so I couldn't seat it properly yet but it still holds the lead screw nicely

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