In the US, Switchcraft made a very popular line of 3.55 mm mono plugs and jacks that are still in production and are often found on older cables and equipment. They were frequently used for custom cables because they were easy to wire. They are not really compatible with modern stereo jacks and can sometimes do serious damage.
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They were more or less standard for many years as they were very high quality. premade molded cables from places like Radio Shack often were built to this dimension as a result.
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It's best to get rid of any old mono cables you have.
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Since they are still available, some folks unwittingly make new cables with them.
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