Metric shafts Ø3 to Ø10 with D-flats and clip grooves — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/metric-shafts/ (CC BY 4.0) Basis: Round shafts at nominal Ø; D-flat 0.1 × d deep over 20 mm at one end; DIN 6799 and DIN 471 groove sizes Catalog version: 2026-10-20 Sizes: see table below - Round shafts at nominal Ø with 0.5 × 45° chamfers on both ends: Ø3 × 100, Ø4 × 100, Ø5 × 100 and × 200, Ø6 × 150, Ø8 × 200 and × 300, Ø10 × 200. - The Ø5, Ø6 and Ø8 shafts carry a D-flat 0.1 × d deep and 20 mm long at one end: 4.5, 5.4 and 7.2 across the flat. A set screw seats on it. - shaft-8x100-grooved: Ø8 × 100 with DIN 471 circlip grooves Ø7.6 × 0.9 starting 10 and 88 mm from the end, and the 20 mm D-flat. shaft-5x80-grooved: Ø5 × 80 with DIN 6799 E-clip grooves Ø4.0 × 0.7 at 8 and 70 mm, and the D-flat. - For the full-length D-flat crankshafts, see the Stirling crankshafts page; these shafts have the short motor-style flat. file Ø length D-flat grooves shaft-3x100 3 100 — — shaft-4x100 4 100 — — shaft-5x100 5 100 0.5 × 20 (4.5 across) — shaft-5x200 5 200 0.5 × 20 (4.5 across) — shaft-6x150 6 150 0.6 × 20 (5.4 across) — shaft-8x200 8 200 0.8 × 20 (7.2 across) — shaft-8x300 8 300 0.8 × 20 (7.2 across) — shaft-10x200 10 200 — — shaft-8x100-grooved 8 100 0.8 × 20 DIN 471 Ø7.6 × 0.9 at 10, 88 shaft-5x80-grooved 5 80 0.5 × 20 DIN 6799 Ø4.0 × 0.7 at 8, 70 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, 10 parts): https://xemstudio.com/files/hardware/metric-shafts/index.json API: https://xemstudio.com/api/geometry?object=metric-shafts