External circlips DIN 471 for Ø4 to Ø20 shafts — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/circlips-din-471/  (CC BY 4.0)
Basis: DIN 471 external retaining rings: groove Ø and width per shaft Ø; ring thickness per the standard
Catalog version: 2026-10-20

Sizes: see table below
- An open ring that springs into a shaft groove, with two lugs (Ø3.2, Ø1.4 holes) either side of the gap. The ring bore is the groove Ø; its OD is 1.9 × the shaft Ø and the gap is 0.35 × the groove Ø.
- Groove Ø × width (ring thickness) by shaft: 4 → 3.8 × 0.5 (0.4); 5 → 4.8 × 0.7 (0.6); 6 → 5.7 × 0.8 (0.7); 8 → 7.6 × 0.9 (0.8); 10 → 9.6 × 1.1 (1.0); 12 → 11.5 × 1.1 (1.0); 15 → 14.3 × 1.1 (1.0); 20 → 19.0 × 1.3 (1.2).
- The groove itself is drawn on shaft-8x100-grooved (Ø7.6 × 0.9).

file  shaft Ø  groove Ø  groove width  ring thickness  ring OD
circlip-4mm  4  3.8  0.5  0.4  7.6
circlip-5mm  5  4.8  0.7  0.6  9.5
circlip-6mm  6  5.7  0.8  0.7  11.4
circlip-8mm  8  7.6  0.9  0.8  15.2
circlip-10mm  10  9.6  1.1  1.0  19.0
circlip-12mm  12  11.5  1.1  1.0  22.8
circlip-15mm  15  14.3  1.1  1.0  28.5
circlip-20mm  20  19.0  1.3  1.2  38.0

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, 8 parts): https://xemstudio.com/files/hardware/circlips-din-471/index.json
API: https://xemstudio.com/api/geometry?object=circlips-din-471