# Coaxial and Twinaxial Suffixes

**URL:** <https://forum.digikey.com/t/coaxial-and-twinaxial-suffixes/114>\
**Category:** Cables, Wires\
**Tags:** part-numbering, coaxial-cables-rf, faqs\
**Created:** [March 28, 2017, 5:04pm UTC](https://forum.digikey.com/t/coaxial-and-twinaxial-suffixes/114 "2017-03-28T17:04:25Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Joey\_Mulqueen](https://avatars.discourse-cdn.com/v4/letter/j/df705f/32.png) [@Joey\_Mulqueen](https://forum.digikey.com/u/Joey_Mulqueen)\
**Post date:** [March 28, 2017, 5:04pm UTC](https://forum.digikey.com/t/coaxial-and-twinaxial-suffixes/114/1 "2017-03-28T17:04:25Z")

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What does the suffix R, G, U, A, B, and C call out when looking at coaxial and twinaxial cables?

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<div class="post-metadata">

**Author:** ![Joey\_Mulqueen](https://avatars.discourse-cdn.com/v4/letter/j/df705f/32.png) [@Joey\_Mulqueen](https://forum.digikey.com/u/Joey_Mulqueen)\
**Post date:** [March 28, 2017, 5:07pm UTC](https://forum.digikey.com/t/coaxial-and-twinaxial-suffixes/114/2 "2017-03-28T17:07:32Z")

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**R** = Radio Frequency  
**G** = Government  
**U** = Universal Specification  
**A** = Revision Level  
**B** = Revision Level  
**C** = Revision Level

Letters that appear before the /U characters (i.e. A, B or C) means a specification modification or revision. For instance, it is common in the CB radio industry to see the designation RG-58 **A** /U. The original RG-58/U coaxial cable had a solid enter conduct. The “A” modification replaced the solid center conductor with a more flexible stranded center conductor (that is highly recommended for use in mobile installations). See link listed below for more details.  
[L-com Cable Tutorial: What is Coaxial Cable and How Is It Used?](https://www.l-com.com/resources/coaxial-cable-tutorial)