Boss Style Knob - 1/4" Smooth Shaft (33mm OD)

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Here's the classic fluted Boss knob. It's got a metal top with a circular ring pattern. It's got a brass insert and a flat head set screw.

Measures 33mm x 16mm

Shaft opening 6.3mm



I've got 5 different sizes of classic fluted Boss-style knobs, from extra-small (20mm) to extra-large (44mm). Check out the measurements below for a size comparison.

Extra-small: 20mm x 11mm

Small: 23mm x 12mm

Medium: 27mm x 15mm

Large: 33mm x 16mm

Extra-large: 44mm x 19.5mm


All shaft openings are 6.3mm.

Beginner's Tip: The term "Boss" refers to the aesthetic design of this knob, with the mirror cap inset into a plastic knob shell. A Boss-style knob will not automatically fit all Boss pedals. The right fit depends on the shaft size of the knob's potentiometer. Read this post to figure out what kind of knob you need:

Shaft Type:
1/4" Smooth Shaft
Knob Diameter:
Knob Color:
Knob Color:
Silver/Aluminum Finish