Set-screw shaft collars Ø3 to Ø12 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/shaft-collars/  (CC BY 4.0)
Basis: Metric set-screw collar envelopes; bore = shaft Ø, radial tapped hole at the ISO tap drill
Catalog version: 2026-10-20

Sizes: see table below
- A ring with one radial tapped hole at mid-width: bore Ø × OD × width and screw: 3 × 8 × 5 M3; 4 × 9 × 5 M3; 5 × 10 × 6 M3; 6 × 12 × 7 M3; 8 × 16 × 8 M4; 10 × 20 × 10 M4; 12 × 22 × 10 M5.
- The bore is the shaft Ø exactly; the screw hole is drawn at the tap drill: Ø2.5 (M3), Ø3.3 (M4), Ø4.2 (M5).
- A collar each side of a bearing locates a shaft along its axis; the set screw seats on the shaft's D-flat.

file  bore  OD  width  screw  tap drill
collar-3mm  3  8  5  M3  2.5
collar-4mm  4  9  5  M3  2.5
collar-5mm  5  10  6  M3  2.5
collar-6mm  6  12  7  M3  2.5
collar-8mm  8  16  8  M4  3.3
collar-10mm  10  20  10  M4  3.3
collar-12mm  12  22  10  M5  4.2

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Circlip — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Circlip
- Wikipedia: Retaining ring — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Retaining_ring
- McMaster-Carr: Shaft collars (free STEP per part, for your own design use; no redistribution) — STEP, PDF — McMaster-Carr site terms [verify license at link] — https://www.mcmaster.com/products/shaft-collars/
- McMaster-Carr: Retaining rings (free STEP per part, for your own design use; no redistribution) — STEP, PDF — McMaster-Carr site terms [verify license at link] — https://www.mcmaster.com/products/retaining-rings/
- Long Earth Society: Engine and rig builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 7 parts): https://xemstudio.com/files/hardware/shaft-collars/index.json
API: https://xemstudio.com/api/geometry?object=shaft-collars