Xem Studiomeasured geometry

Library › Hardware › Picatinny rail (MIL-STD-1913): profile, grooves and mount jaw

Female profile for designing a mount

Female profile for designing a mount: block with the MIL-STD-1913 rail removed and a .206 in recoil key; nominal, add clearance

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

Picatinny rail (MIL-STD-1913): profile, grooves and mount jaw: every size, notes, mating features and sources. What are the exact Picatinny rail dimensions (MIL-STD-1913)?

Other sizes