Xem Studiomeasured geometry

Library › Hardware › Flywheels Ø100–Ø200 with hex-nut rim pockets

flywheel-120-3-8in-b3

Ø120 flywheel, 12 pockets for 3/8 in hex nuts at R49.9 (one flat facing out), Ø3 hub with M3 grub, 9.8 thick rim; full set ≈ 93 g of nuts, +2.3 kg·cm²

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

OD120
nut3/8 in
pockets12
pocket circle R49.9
rim thickness9.8
rim width20.3
hubØ20 / Ø22 × 13.8
bores3 / 5 / 8
Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
Set it up →

From the full sheet

Flywheels Ø100–Ø200 with hex-nut rim pockets: every size, notes, mating features and sources. How is a flywheel with hex nut pockets in the rim laid out?

Other sizes