Xem Studiomeasured geometry

Library › Hardware › Woodruff keys, inch (ANSI B17.2): key numbers #202 to #1212, key…

Key No. 1011

Key No. 1011: 5/16 × 1-3/8 in disc segment (7.94 mm thick, 34.92 mm diameter), height 15.08 mm (= radius minus the 3/32 in flat offset), chord 34.60 mm; nominal values, no edge breaks

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

key no.1011
nominal W × B, in5/16 × 1-3/8
key length F, in1.362
height C max / min, in0.594 / 0.589
height D max / min, in0.584 / 0.578
flat below centre E, in3/32
shaft seat width A min – max, in0.3111 – 0.3130
shaft seat depth B, in0.4328
cutter diameter F min – max, in1.375 – 1.398
key above shaft C, in0.1562
hub seat width D, in0.3135
hub seat depth E, in0.1622
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

Woodruff keys, inch (ANSI B17.2): key numbers #202 to #1212, key sizes and keyseat depths: every size, notes, mating features and sources. What are the dimensions of a Woodruff key (#404, #606, #1212) and the keyseat depth in the shaft and hub (ANSI B17.2)?

Other sizes