How to read Gummi codes: designation structure, prefixes, suffixes and real examples

Gummi couplings are recognized in Argentine industry for their robustness and reliability. To select the right coupling, it is essential to understand how their codes are structured. In this guide we explain the logic behind Gummi designations, so you can interpret any reference and order the correct replacement part.

Gummi nomenclature follows a logical pattern combining letters and numbers. Each part of the code provides information about the coupling type, its size and specific characteristics. Knowing this structure allows you to quickly identify the product and avoid ordering errors.

As an official Gummi distributor, at MR Accesorios Industriales we work with the complete line of couplings and help you decode any code. If you have doubts, you can consult us with the reference or a photo of the part.

A typical Gummi code consists of an alphabetic prefix and a number. The prefix indicates the series or type of coupling, while the number generally refers to the size or shaft diameter. For example, in codes A-50, A-20 and A-90, the letter A identifies a specific series and the number corresponds to a nominal measurement.

It is important not to confuse the number with a direct measurement in millimeters; it is usually an indicator of relative size within the series. To know the exact dimensions, you must always consult the technical catalog or the product data sheet.

In addition to the prefix and number, some codes may include suffixes indicating variants, such as different elastomer materials or surface treatments. These suffixes are added after the main number, separated by a hyphen or without a separator.

In the Gummi coupling line, the most common prefixes are letters such as A, B, C, etc., which designate different series. Each series has particular design characteristics, torque capacity and recommended applications. For example, series A is usually for general use, while other series may be oriented to high-power applications or special requirements.

Knowing the prefix allows you to quickly identify the type of coupling and its compatibility with your equipment. If you are not sure which series corresponds to your application, you can consult us and we will guide you based on your machine data.

At MR we carry the complete range of Gummi couplings, including the most widely used series in industry. We work with the official catalog references and provide quotes for any code you need.

The number following the prefix in a Gummi code is related to the coupling size. Generally, the higher the number, the larger the shaft diameter and the greater the torque transmission capacity. For example, an A-90 coupling is larger than an A-50, and this in turn is larger than an A-20.

However, the number is not a direct measurement; it is a size code that corresponds to specific dimensions in the manufacturer's tables. To select the correct coupling, it is necessary to verify the shaft diameter and required torque, and then choose the code that meets those parameters.

If you have the code of an existing coupling, you can use it to order an exact replacement. If you do not have it, with the shaft measurements and the application we can help you identify the appropriate code.

Some Gummi codes include suffixes indicating specific variants. These suffixes may refer to the type of elastomer, the presence of tapered bushings, special treatments or versions for particular environments. For example, a suffix such as -R could indicate a reinforced version, although you should always confirm with the catalog.

It is crucial to respect the suffixes when ordering a replacement part, since an incorrect variant may not be compatible with your installation. If you have doubts about the meaning of a suffix, consult us and we will clarify it.

At MR we work with all available variants of Gummi couplings and advise you so you choose the correct option. Send us the complete code or a photo of the identification plate and we will quote the replacement.

To illustrate the nomenclature, let's look at some examples of Gummi codes we carry: A-50, A-20 and A-90. These codes belong to series A and differ by size number. The A-20 is the smallest of the three, suitable for light applications; the A-50 is intermediate in size; and the A-90 is the largest, for higher torque demands.

These examples show how the combination of letter and number allows you to quickly identify the type and size of the coupling. When requesting a quote, it is always advisable to indicate the complete code, as it appears on the part or in the equipment manual.

If you cannot find the exact code, you can send us a photo of the coupling with a ruler or caliper next to it, and we will help you identify it. You can also tell us the shaft measurements and motor power to select the appropriate coupling.

When requesting a Gummi coupling, it is important to have as much information as possible on hand: complete code, shaft measurements, motor power and speed, and operating conditions. With that data, we can quote you the correct coupling without margin for error.

If you do not have the code, do not worry: with a clear photo of the part and some basic measurements, we can identify the model. It is also useful to know the brand and model of the machine where the coupling is mounted.

At MR Accesorios Industriales, as an official Gummi distributor, we offer technical advice so you choose the right coupling. Contact us by WhatsApp or email and we will respond promptly with the quote.