Introduction
This document provides technical specifications and guidelines for using limit gauges to monitor the wear and tear of hoist chains, ensuring operational safety and preventing accidents.

Specifications
The limit gauge is designed to check the wear on hoist chains by measuring the multiple link pitch attachment. It is adaptable to different hoist types, whether manual or motor-driven, and is lightweight and portable for easy use.

Procedures
1. Insert one measuring pin into the first guide hole.
2. Insert the second pin into the guide hole corresponding to the chain size.
If the pins can be inserted, the chain is in good condition. If not, the chain has reached the end of its service life.

Standards and Norms
The monitoring of hoist chains must comply with DIN 685 T5 or ISO 7592 standards. Chains should be replaced if wear or distortion exceeds 2% for motorized hoists or 3% for manual hoists.

Recommendations
Regularly check the chain using the limit gauge to ensure safety and replace the chain if it exceeds the specified wear limits.

Key Data
The gauge length is calculated as L₀ = 11t + 2dn, where 't' is the inner pitch attachment and 'dn' is the nominal diameter. The discard dimension is L₀ + 2% or 3% depending on the hoist type.

Conclusion
Using the RUD limit gauge helps in maintaining the safety and longevity of hoist chains by providing a reliable method to measure wear and determine when a chain should be replaced.