An example of an inner thread on a cylinder.

// Inner Thread
// An example of an inner thread on a cylinder.
// Categories: Fasteners

outerCylinderRadius = 5
outerCylinder = circle(startSketchOn(XY), center = [0, 0], diameter = outerCylinderRadius * 2)
  |> extrude(length = 10)

inner = circle(startSketchOn(XY), center = [0, 0], diameter = 8)
  |> extrude(length = 10)

rectHeight = 0.5mm
rectWidth = 0.5mm

threadProfile = rectangle(
  startSketchOn(XZ),
  width = rectWidth,
  height = rectHeight,
  center = [
    outerCylinderRadius - (rectWidth * 2),
    0
  ],
)
threadHelix = helix(
  revolutions = 10,
  angleStart = 0deg,
  cylinder = inner,
  length = outerCylinderRadius * 2 + rectHeight * 2,
)

thread = sweep(threadProfile, path = threadHelix)

subtract([outerCylinder], tools = [inner, thread])


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inner-thread