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Most 6.35 mm ( in) plugs, mono or stereo, now have the profile of the original stereo plug, although a few rounded mono plugs are also still produced.
The profiles of stereo miniature and subminiature plugs have always been identical to the mono plugs of the same size.
The "mini" connector has a diameter of 3.5 mm (0.14 in) and the "sub-mini" connector has a diameter of 2.5 mm (0.098 in).All three sizes are now readily available in two-conductor (unbalanced mono) and three-conductor (balanced mono or unbalanced stereo) versions.Four- and five-conductor versions of the 3.5 mm plug and jack are used for certain applications.When a three-conductor version of the 6.35 mm ( in) jack was introduced for use with stereo headphones, it was given a sharper tip profile in order to make it possible to manufacture jacks (sockets) that would accept only stereo plugs, to avoid short-circuiting the right channel of the amplifier.This attempt has long been abandoned, and now the normal convention is that all plugs fit all sockets of the same size, regardless of whether they are balanced or unbalanced, mono or stereo.
These are mid-size TS or TRS phone plugs with a 4.4 mm (0.17 in) diameter shaft and a slightly different geometry.