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On a Roland TR09 (rear view) (Roland's 2016 recreation of their famous TR909):

enter image description here

we can see a stereo volume potentiometer, that is smaller than usual.

Question: Is this

  1. a normal potentiometer + a "striated" black cap (if so, what is the proper name? I guess striated cap is not the right name, I haven't found anything with this name)

or

  1. some small potentiometer with black rubber-looking shaft, all-in-one?

Note: it's not a sourcing question, but I'd like to know what kind of component it is, and the proper name of it (this will allow me to search then).

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    \$\begingroup\$ Sometimes they are called "knurled" although typically knurled knobs are a hatch pattern. On Mouser they are referred to as "Knurled - Straight". You would usually source the knob separate from the potentiometer itself, it slides onto the shaft. \$\endgroup\$ – Ron Beyer Nov 28 '17 at 0:19
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Pot. Knobs come in 3 types "Flat" or D shape, Slotted and Knurled 20 or 40 teeth as well as various shaft length , 15 to 35mm in 5mm increments with linear and log. (audio) profiles and shaft diameters such as 6mm.

This would be a right angle PCB mount, log. , knurled 6mm 40 tooth, Pot.

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  • \$\begingroup\$ Thanks! Do you think I should look for 2. (pot+knob all in one), or 1. (I should shop pot and knob separately)? \$\endgroup\$ – Basj Nov 28 '17 at 0:33
  • \$\begingroup\$ Something else: when pot manufacturers say "16mm pot" or "9mm pot", does 16 and 9 refer to shaft, width, height, diameter, something else, etc. ? \$\endgroup\$ – Basj Nov 28 '17 at 0:34
  • \$\begingroup\$ approx. diameter \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Nov 28 '17 at 0:38
  • \$\begingroup\$ For example this one seems to be a 16mm. The shaft cylinder has not a 16mm diameter, right? \$\endgroup\$ – Basj Nov 28 '17 at 0:43
  • \$\begingroup\$ Body diameter, not shaft \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Nov 28 '17 at 0:59

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