Xem Studiomeasured geometryLibrary › Hardware › Hex keys (Allen keys): ISO 2936 metric 0.7–36 mm and ASME B18.3 inch…
hexkey-asme-b18-3-1-8in
inch hex key 1/8 in across flats (3.175 mm), e max 3.602 mm, long arm 2.25 in, short arm 0.75 in, short-arm series (ANSI B18.3, Alma Bolt / AFT); bend centre-line radius 2 x s is an Xem choice
Exact dimensions. True size, no tolerance added. Threads are plain cylinders at the major diameter.
STEP STL free, CC BY 4.0 (credit "Xem Studio")
Dimensions
| type | inch |
|---|---|
| s across flats (mm) | .050 in = 1.270 |
| s min (mm) | — |
| e across corners max (mm) | 1.42 (0.0560 in) |
| e min (mm) | — |
| l1 long arm standard (mm) | 42.1 (1.656 in) |
| l1 long series (mm) | 72.2 (2.844 in) |
| l1 extra-long (mm) | — |
| l2 short arm (mm) | 13.5 (0.531 in) |
| ISO 2936:1995 l1 / l2 (mm) | — |
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.From the full sheet
Hex keys (Allen keys): ISO 2936 metric 0.7–36 mm and ASME B18.3 inch .050–7/8 in: across flats, across corners, long and short arm + 31 key models: every size, notes, mating features and sources. How long are hex keys, and what are the across-flats and across-corners sizes of a 2, 3, 4, 5, 6, 8, 10 mm or 1/8, 3/16, 1/4 in Allen key?
Other sizes
- ISO 2936, 2001 hex key s = 1.5 mm across flats, corners rounded to e max 1.68 mm
- ISO 2936, 2001 hex key s = 2 mm across flats, corners rounded to e max 2.25 mm
- ISO 2936, 2001 hex key s = 2.5 mm across flats, corners rounded to e max 2.82 mm
- ISO 2936, 2001 hex key s = 3 mm across flats, corners rounded to e max 3.39 mm
- ISO 2936, 2001 hex key s = 4 mm across flats, corners rounded to e max 4.53 mm
- ISO 2936, 2001 hex key s = 5 mm across flats, corners rounded to e max 5.67 mm
- ISO 2936, 2001 hex key s = 6 mm across flats, corners rounded to e max 6.81 mm
- ISO 2936, 2001 hex key s = 8 mm across flats, corners rounded to e max 9.09 mm
- ISO 2936, 2001 hex key s = 10 mm across flats, corners rounded to e max 11.37 mm
- ISO 2936, 2001 hex key s = 12 mm across flats, corners rounded to e max 13.65 mm
- ISO 2936, 2001 hex key s = 14 mm across flats, corners rounded to e max 15.93 mm
- ISO 2936, 2001 hex key s = 17 mm across flats, corners rounded to e max 19.35 mm
- ISO 2936, 2001 hex key s = 19 mm across flats, corners rounded to e max 21.63 mm
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