---
title: "What is a safety nut in screw jacks?"
url: "https://zimm.com/wiki/what-is-a-safety-nut-in-screw-jacks/"
datePublished: "2025-07-25T07:01:54+00:00"
dateModified: "2026-06-29T06:07:43+00:00"
author: Jonathan Mildner
lang: en
canonical: "https://zimm.com/wiki/what-is-a-safety-nut-in-screw-jacks/"
markdown: "https://zimm.com/ai/wiki/what-is-a-safety-nut-in-screw-jacks.md"
categories: "Questions and answers about our products, Accessories"
---

The [safety nut](https://zimm.com/product/safety-nut-sifa-r/) engages if the load-bearing travelling nut fails. It mechanically catches the load and prevents uncontrolled lowering – especially important in safety-critical applications.

- Mechanical redundancy
- Protection in case of thread failure
- For safety-relevant applications

https://youtu.be/JZAq1fDo_8Y

https://youtu.be/zFsnwI6DQ2A

## Videos

### Sicherheit & Überwachung | Ausfallzeiten vermeiden & Personen schützen

In this video, viewers will learn about the importance of safety nuts in screw jacks, focusing on how they prevent uncontrolled lowering of loads in safety-critical applications.

- [Watch on YouTube](https://www.youtube.com/watch?v=JZAq1fDo_8Y)

### Sicherheit bei Spindelhubgetrieben – Einsatz der Sicherheitsfangmutter

In this video, viewers will learn about the safety nut in screw jacks, including its role in preventing uncontrolled lowering and providing mechanical redundancy in safety-critical applications.

- [Watch on YouTube](https://www.youtube.com/watch?v=zFsnwI6DQ2A)