Shafts, D-flats, set-screw collars, E-clips (DIN 6799) and circlips (DIN 471) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/shaft-collars-clips-and-shafts/  (CC BY 4.0)
Basis: DIN 6799 E-clip and DIN 471 circlip groove dimensions; set-screw collar envelopes typical of metric catalogue parts; h6 precision rod
Catalog version: 2026-10-20

Sizes: see table below
- E-clip grooves (DIN 6799), shaft → groove Ø × width: 2 → 1.4 × 0.4; 3 → 2.3 × 0.5; 4 → 3.2 × 0.7; 5 → 4.0 × 0.7; 6 → 5.0 × 0.7; 8 → 6.0 × 0.9; 10 → 8.0 × 1.1 mm. Circlip grooves (DIN 471): 5 → 4.8 × 0.7; 6 → 5.7 × 0.8; 8 → 7.6 × 0.9; 10 → 9.6 × 1.1; 12 → 11.5 × 1.1; 15 → 14.3 × 1.1; 20 → 19.0 × 1.3 mm.
- Set-screw collars: Ø3 bore 8 OD × 5; Ø5 10 × 6; Ø6 12 × 7; Ø8 16 × 8; Ø10 20 × 10; Ø12 22 × 10 (M3/M4/M5 screws). A collar each side of a bearing locates a shaft axially; a printed collar in PETG with an M3 holds a 5 mm shaft for light duty.
- D-flat: 0.4 × d deep (5 mm shaft → 2 mm flat, leaving 3 mm), 20 mm long; a set screw seats on it. Precision rod is h6 (5 mm: 5.000/4.992); a printed Ø5.2 hole is a running fit, Ø4.9 press.
- LES: Ø8 flywheel shafts in 608s with circlip grooves; Ø5 crank shafts in 625s with E-clips; collars where a clip groove is too much work.

item  shaft_mm  groove_dia_mm  groove_w_mm  collar_od_x_w
E-clip  2  1.4  0.4  
E-clip  3  2.3  0.5  
E-clip  4  3.2  0.7  
E-clip  5  4.0  0.7  
E-clip  6  5.0  0.7  
E-clip  8  6.0  0.9  
E-clip  10  8.0  1.1  
circlip  4  3.8  0.5  
circlip  5  4.8  0.7  
circlip  6  5.7  0.8  
circlip  8  7.6  0.9  
circlip  10  9.6  1.1  
circlip  12  11.5  1.1  
circlip  15  14.3  1.1  
circlip  20  19.0  1.3  
collar  3      8 × 5, M3
collar  4      9 × 5, M3
collar  5      10 × 6, M3
collar  6      12 × 7, M3
collar  8      16 × 8, M4
collar  10      20 × 10, M4
collar  12      22 × 10, M5

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, 32 parts): https://xemstudio.com/files/hardware/shaft-collars-clips-and-shafts/index.json
API: https://xemstudio.com/api/geometry?object=shaft-collars-clips-and-shafts