Xem Studiomeasured geometry

Library › Everyday mounts › RAM-style mount ball sizes: A 0.56, B 1, C 1.5, D 2.25 and E 3.38 in

RAM-style D size ball

RAM-style D size ball: Ø2.25 in = Ø57.150 mm sphere (the ball only; the base or arm it sits on differs per part)

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")

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

RAM-style mount ball sizes: A 0.56, B 1, C 1.5, D 2.25 and E 3.38 in: every size, notes, mating features and sources. What size is a RAM mount ball?

Other sizes