Within the audio industry, you'll find that most smooth shaft pots measure 1/4" (6.35mm). You'll also see 6.0mm, but it's less popular. There are three main types of potentiometer shafts in our audio world: smooth shaft,18T split/knurled shaft,and D shaft. The knob you use will depend on the shaft style. Youoftencan use a smooth shaft 1/4" knob on a 6.0mm pot, whether smooth or knurled shaft. (Some people report a slight wobble off-axis when the knob is turned, but it's pretty negligible for most builders. It depends on how particular the personality of the user is.) 18T Split/Knurled Shaft What kind of potentiometer shaft does your piece of gear have? Remove the offending knob and find out!

Keep reading for some basic information on sizes and styles of potentiometer shafts, how to measure shaft diameters of potentiometers and knobs, and "close enough" tips that can help you make a decision on whether a particular knob will fit on your piece of gear. Potentiometer Sizes and Styles Yep! Most1/4" knobs fit will securely on a 6.0mm knurled shaft pot. Again, a Potentiometer Adapter can be your friend here. Slide on the adapter and voila!—a perfect fit for your 1/4" knob. D Shaft A smooth shaft knob can be retrofit, using a shim, to fit a D shaft pot. Additionally,1/4" knobs with long set screws should still work—as long as the set screw is long enough. We keep a huge number of different Flanged Nylon Bush sizes between 2.1mm - 50mm. However, if you require a size that you cannot find below, please be sure to get in touch. Alternatively, if you would like to request a free sample, please see the product table below where the relevant information is displayed.D shaft potentiometers (also called "flatted" potentiometers) bear resemblance to their name: The shaft forms a "D" shape, with one flat edge. Some 6.0mm knurled shaft knobs will fit tightly on D shaft potentiometers. This seems to vary by potentiometer and finding a fit is more of an art than a science. There are many sizes of D shafts;the most common size measures 6 x 4.5mm.For best fit use a D shaft knob on a D shaft pot. Advantage of D shaft is it prevents shaft from spinning inside the gear hub. So it is preffered in gears. An example Featuring a top hat flange as well as a shank for internal threading, these are extremely versatile as well as easy to use product popular inside a host of industries.

The "18T" in this potentiometer refers to the number of "teeth" around the shaft. Each one helps to grip the inside of a 18T or 36T knurled shaft knob, which features corresponding teeth. D shaft to D hole without a setscrew will be preferable to D shaft to round hole with setscrew if there is no axial movement. Best is D shaft to D hole with setscrew(s). However you can't always find D holes because they're more costly to manufacture. Do we have a knob that is an exact fit for that potentiometer shaft? All of our knobs indicate shaft size (1/4" or 6.0mm) and style (smooth or knurled). For best fit, use a Potentiometer Adapter. These smooth brass sleeves slide onto the pot shaft, converting a 6.0mm pot into 1/4".

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If yes, what are you waiting for? Buy that knob! If no, then let's see if we can find you a "close enough" fit that functions well and looks awesome.