Crank webs (bar cranks), Ø5 bore, 10 to 30 mm stroke — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/crank-webs-5mm-bore/  (CC BY 4.0)
Basis: Bar crank 6 thick with a Ø22 × 12 hub, Ø5 bore, Ø3 pin at stroke / 2 and a counter-mass lobe
Catalog version: 2026-10-20

Sizes: see table below
- A 14 mm wide bar 6 thick with a Ø3 pin hole at half the stroke, a Ø18 counter-mass lobe centred 6 mm behind the axis, and a Ø22 hub 12 tall with a Ø5 bore.
- A radial Ø2.5 hole (M3 tap drill) 9 mm up the hub locks it to the shaft.
- Two webs and a Ø3 pin make a throw in the middle of a shaft, so the con-rod sits between two bearings.
- Overall length 27, 29.5, 32, 34.5, 37 for 10–30 mm stroke; 22 wide.

file  stroke  pin offset  overall  hub
crank-web-stroke10  10  5.0  27 × 22 × 12  Ø22 × 12
crank-web-stroke15  15  7.5  29.5 × 22 × 12  Ø22 × 12
crank-web-stroke20  20  10.0  32 × 22 × 12  Ø22 × 12
crank-web-stroke25  25  12.5  34.5 × 22 × 12  Ø22 × 12
crank-web-stroke30  30  15.0  37 × 22 × 12  Ø22 × 12

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Engine balance — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Engine_balance
- Wikipedia: Crankshaft — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Crankshaft
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 5 parts): https://xemstudio.com/files/hardware/crank-webs-5mm-bore/index.json
API: https://xemstudio.com/api/geometry?object=crank-webs-5mm-bore