# Shaft collar

A DIN 705 form A set collar, or a one-piece clamp collar's envelope. Axis along Z, centred on the origin.

## Geometry

A ring of outside diameter D, bore d and width b. A set collar's radial hole runs along +X from the bore to the outside,
drawn at the thread's nominal diameter. A clamp collar's slit and screw aren't modelled: the sources give the screw's size
and location, not the slit.

## Source

- **Set collars:** DIN 705 form A, as tabulated by Maedler (light-duty series, set screw DIN EN ISO 4027), item pages
  623003006 to 623020006 through its distributor <https://eshop.ameco.cz/products/en/3/1625/g1574/623008006/>:

| d | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 16 | 20 |
|---|---|---|---|---|---|---|---|---|---|
| D | 7 | 8 | 10 | 12 | 16 | 20 | 22 | 28 | 32 |
| b | 5 | 5 | 6 | 8 | 8 | 10 | 12 | 12 | 14 |
| Screw | M2 × 3 | M2.5 × 3 | M3 × 4 | M4 × 5 | M4 × 6 | M5 × 8 | M6 × 8 | M6 × 8 | M6 × 8 |

- **Clamp collars:** Ruland one-piece, MCL-8-F product sheet (bore 8, OD 18, width 9),
  <https://docs.rs-online.com/09ba/0900766b816574f5.pdf>; MCL-6-F (6, 16, 9) from Zoro's listing,
  <https://www.zoro.com/ruland-shaft-collar-clamp-1pc-6mm-steel-mcl-6-f/i/G0811474/>; MCL-20-AN (20, 40, 15) from
  Zoro's listing, <https://zoro.com/ruland-mountable-collar-1pc-clamp-bore-20mm-anod-aluminum-od-40mm-of-mcl-20-an/i/G3401906>.

Clamp collars of bores 3, 4, 5, 10, 12 and 16 mm and two-piece clamp collars aren't offered: no table reachable so far
gives them (the maker's site refuses automated reads). Maker names identify the source; not affiliated with any maker.

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