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

length

184.1 mm

width

54.0 mm

height

21.8 mm

Notes

• A hex key (Allen key, Allen wrench, hex wrench, L-key) is a hexagonal bar bent to an L. The hexagon is the size of the screw socket (s, across flats); the long arm (l1) gives reach and the short arm (l2) gives torque. ISO 2936 lists s from 0.7 to 36 mm with e (across corners), l1 in a standard, a long and an extra-long series, and l2 (short arm). Metric rows in the table are the ISO 2936:2001 values: s min is the lower limit (s max equals s nominal), and e max / e min are the across-corners limits. The 'ISO 2936:1995' column shows the l1 / l2 that edition prints for the same s, because the two editions differ (for example s = 2 mm: 50 / 16 in 1995, 52 / 18 in 2001; s = 5 mm: 80 / 28 against 85 / 33). The 1995 sample as read lists fewer sizes than the 2001 table (no 3.5, 4.5, 7, 9, 11, 13, 15, 16, 18, 21, 23, 29 or 30 mm rows). ISO 2936:2014 (sixth edition, a minor revision of 2001 per the iTeh catalogue) is the current edition; its free sample shows only fragments of Table 1, so the 2001 numbers are used and the models follow them. A copy of the 2001 table on amesweb gives the same values for s = 2, 5, 10, 19 and 36. Check the key you hold: makers do not all follow the same series.
• Inch rows follow ANSI B18.3 as printed by two sources that agree to within 0.001 in on every size used: Alma Bolt's table (min / max for both arms, midpoints equal AFT's nominals) and AFT Fasteners' short-arm and long-arm SAE tables. Sizes .028, .035 and 1 in are left out: the Alma .035 row is out of sequence (long arm larger than the .050 row), and the AFT 1 in row repeats the .050 numbers. AFT's 1/2 in minimum width is mistyped in the source and is not used. The 'long series' column (AFT only) is the longer-arm key sold in the same sizes. Across corners e max is Alma's value. The 'mm' of the inch rows are inch × 25.4 and are computed here.
• Models: all 31 files are Xem-drawn from the numbers above: a hexagon of the key's across-flats size with each corner rounded to the e max circle, swept along an L with arms l1 and l2 measured as overall extents (tip of the long arm at one end, outer face of the short arm at the other). The bend radius is an Xem choice, 2 × s on the centre line, because no source read gives it. Metric models use the 2001 'standard' l1 and l2 for s = 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10, 12, 14, 17 and 19 mm; inch models use the short-arm series for .050 to 3/4 in. Models carry no markings, ball ends or hardness details. A key holder or drill-through rack needs the hexagon (across corners e max) for the slot and l1 / l2 for the length.
• Not here: Torx, Pozidriv, Phillips, spline and tamper-proof keys; T-handle and folding sets; ball-end geometry; the 2014 edition's changes if any; tolerances on arm length (the standard has them, the sample reads only partly).

Hex keys (Allen keys): ISO 2936 metric 0.7–36 mm and ASME B18.3 inch… size chart

Mating features

Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits as drawn.

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Free files

★ Free files 31 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

Plain text: sheet.txt · JSON: /api/geometry?object=hex-keys-iso-2936-asme-b18-3

Fits with

Free

Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)7 sizes★ 47 filesFree

Socket head cap screws, inch #0 to 1-1/2 (ASME B18.3): head, hex socket, key engagement — full size table + models #0 to 150.8×38.1×76.2 mm★ 18 filesFree

Socket set screws, inch (ASME B18.3), cup point: hex key size, cup and flat point diameter, shortest length #0 to 118 sizes★ sheetFree

Shoulder screws ISO 7379 (metric): shoulder Ø, thread, head size, hex key, thread length, M5 to M207 sizes★ 7 filesFree

Shoulder screws ASME B18.3 (inch): shoulder Ø 1/4 to 3/4 in, thread, head size, hex key, thread length6 sizes★ 6 filesFree

Hex bit shank 1/4 in (ISO 1173 C 6.3 and E 6.3): across flats 6.35 mm, across corners 7.18 mm, form C and E dimensions, 4–12.5 mm sizes + hex pocket gauge86.6×28.7×12.0 mm★ 1 fileFree

Square drive sizes ISO 1174: 1/4, 3/8, 1/2, 3/4, 1 in drive (6.3, 10, 12.5, 20, 25 mm): male and female square limits + stub rail and pocket plate121.0×41.4×18.0 mm★ 2 files