From Theory to Practice: A Complete Overview of Ring Gauges and Their Applications

Ring gauges are an important measuring tool used in various industries. It ensures accuracy and reliability of measurements. From beginners to experienced professionals, everyone can profitably use ring gauges to achieve accurate results. In this article, we will look at the main aspects of ring gauges and their use.

What are ring gauges and what are they for?

Ring gauges are measuring devices used to measure the external diameter of parts. They provide high measurement accuracy and are a necessary tool in many industries, such as metalworking, automotive, medicine, aerospace or military, shipbuilding, and others. Ring gauges can be thread, plain and setting.

Thread Ring Gauges: characteristics and use

Ring thread gauges are used to measure threads on the outer surface. These gauges are distinguished by their design, which allows them to accurately and reliably measure thread parameters. An important feature of ring thread gauges is their ability to provide accurate measurements relative to the thread profile. Thread gauges have built-in threads that match different threads. This allows them to fit exactly into the thread profile on the external diameter of the product.

The use of thread ring gauges allows you to make the following important measurements:

Thread diameter: Determined by placing a thread gauge on the outer surface of the thread and measuring its diameter on a scale.

Thread Pitch: Determined by measuring the distance between two adjacent lugs or ends of thread gauges.

Thread Profile Shape and Angle: Some thread gauges can also help determine the shape and angle of the thread profile if needed.

Go/No-Go ring gauges for quick and effective quality control of thread connections

Ring gauges Go:

Go rings represent an exact model of the thread profile, which must correspond to the standard dimensions of the thread. If the thread fits into the Go gauge, it is considered acceptable and compliant with the standard.

No-Go gauges have a size smaller than standard thread sizes. Used for deviation: If the thread does not fit in the gauge, then this indicates a deviation from the standard or unacceptability of the product.

The use of GO/NOGO gauges allows for effective and quick quality control of products with threaded connections, helping to avoid production defects and ensuring high accuracy of measurements.

TruThread ring gauges are manufactured in accordance with all requirements and specifications.

Plain ring gauges for measuring diameters without threads

Plain ring gauges are gauges used to measure diameters that do not have threads. These gauges are important for ensuring measurement accuracy and quality control in manufacturing processes. Unlike thread gauges, plain gauges have a smooth surface that allows them to fit precisely on parts without threads.

Plain Ring gauges Go/No-Go:

Plain GO gauge represents the exact pattern of the hole. They are used to measure diameters that must correspond to standard sizes. If the part easily passes through the gauge, it is considered acceptable.

No-Go gauges are used to determine the part is not acceptable if it does not enter or enters with difficulty. If the part does not pass through the gauge, it is considered rejected.

Setting rings are used to check products for compliance with specified standards and dimensions. These rings can have a smooth interior and are mounted on a shaft or axle to check their size and shape.

The use of plain ring gauges contributes to effective product quality control and ensures high accuracy of measurements during production.

Advantages and disadvantages of using ring gauges in various industries


  • High accuracy of measurements.
  • Ease of use.
  • Ability to measure hard-to-reach places.


  • The cost of high-precision models.
  • Dependence on correct operation.
  • Study of sizes and technical characteristics of ring gauges

When choosing the ring gauge, you should pay attention to its dimensions, material, manufacture and accuracy class. These parameters determine the capabilities and range of application of a particular caliber.

How to use ring gauges correctly

  • Check the cleanliness and serviceability of the caliber before use.
  • Follow the manufacturer's instructions.
  • Avoid sharp impacts and overheating.

Truthread Europe is a leading manufacturer of high quality ring gauges. Their catalog includes a variety of models with different technical characteristics that will satisfy the needs of both beginners and professionals in various industries.

In general, ring gauges are an integral element of measurement that allows you to provide both ity and accuracy of production. Regardless of your level of experience, the correct selection and effective use of ring gauges will allow you to achieve excellent results in your activity.