EN
USD

Rope tension measurement

The basis of the simple method is easy: you grab the rope in the middle of two points and pull it sideways to get a certain displacement. Measure the force required to achieve this displacement (using a spring balance, for example). The greater the force required to achieve the same displacement, the greater the tension (which is obvious).

You can also calculate the tension:

  • Distance between points on the rope: L [mm]
  • Displacement: D [mm]
  • Pulling force: F [N]
  • Tensile force: T [N]

T = F * L / D / 4

The formula is reasonably accurate if the distance between the points is much greater than the displacement (L >> D).

Here is one of many instruments based on this principle: 

There are many different measuring tools on the market, for example from Loos&co this one. Be careful because these tensioners are calibrated for steel ropes, not for synthetic ones. The gauges for steel ropes usually have a small distance between measuring points.

A good indicator of the tension in the rope is its sag (of course, if all ropes are the same length and there is no strong wind).

News

  • Rope tensioning carabiner CamJam (Aluminum) 20. 12. 2022

    Just before the end of the year we put this new product on sale - Rope tensioning carabiner CamJam (Aluminum), which combines a strong carabiner with a cam locking mechanism.

     
  • Mastrant-R 2 mm (1/16 in.) on sale 2. 12. 2022

    Have you noticed that we also sell this popular rope Mastrant-R, this time in 2mm diameters? Take a look here.

     
  • New Mastrant discussion group 10. 11. 2021

    We have a new discussion group (https://groups.io/g/mastrant). Feel free to join. Here you can discuss with others anything related to Mastrant products - what you don't know, or what you want to share with others, so you can help them.

     
Read more