i/4" knob with extended 'shoulder' to push onto control in recess

Oct 27, 2025 Last reply: 8 months ago 4 Replies
C

I'm looking for a fairly standard push on 1/4" control knob (as in on/off volume control type thing) which has an extended 'shoulder' to allow it to be pushed onto a control shaft that is in a fairly narrow recess. The recess is about 1cm diameter, I suppose I could enlarge it a bit but I'd prefer not to.



Searching for 1/4" control knob produces zillions of hits but I can't see any with the sort of shoulder I'm looking for. Does anyone have an idea where I might find one and/or the magic name of the type of knob I'm looking for?


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A

Do a google image search for

control knob potentiometer +"half shaft"

formatting link

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C

Brilliant, thank you! I'd never have guessed that name for it!

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P

The knobs with a shoulder are "top hat" knobs.

Whether the knob adheres by a screw fixing or uses a compression spring, would have an impact on whether it could be 3D printed. The format of the shaft (knurled or half-shaft) makes a difference to the knob purchase too. This means the "interior finish" of the knob where it meets the shaft, is super-important to success. Sometimes, the form factor is correct, but the "depth" of the aperture is wrong for the job. There are lots and lots of ways for a knob purchase to fail.

Paul

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