# Round clearance spacer (Harwin R30-601, M3)

Unthreaded round spacer for M3 screws at any length. Presets cover the catalogue's M3 clearance spacers at the lengths
Harwin sells.

## Geometry

A tube, outside diameter **D** 4.76, bore **d** 3.30, length **L**, axis along +Z, one end on the XY plane, centred
on the origin. Chamfers are not modelled.

## Parameters

| Parameter | Meaning |
|---|---|
| `clearance` | Screw size: M3 |
| `length` | Length L, mm |

## Source

Harwin, customer information sheet R30-601XX02 "M3 circular clearance spacer" (drawing DRG-02004, issue 5,
15.10.06), brass CW614N, nickel finish; Ø4.76, Ø3.30; L ± 0.10 up to 12 mm, ± 0.15 over; lengths 2–16, 18, 20, 22,
25, 30 (the technical drawing PDF on Harwin's content server, content.harwin.com, linked from the R30-601 series
page on https://www.harwin.com).

Not covered: clearance spacers for M2, M2.5 and M4, and M3 spacers longer than 30 mm: no maker table with their
dimensions was found (an Ettinger Ø2.6/4.5 spacer appeared only in a search snippet; Würth WA-SBRRO's product page
does not say whether its bore is plain and no datasheet was read).

Preset list: sizes of the step.parts catalogue (MIT), see `library/NOTICE.md`.