The 4 mm-XL hex key (ISO 2936, extra-long arm) has a long arm of 144 mm and a short arm of 29 mm, 4 mm across flats. Here as simplified STEP files.

How these parts are made, and what the levels mean: read the method
- Also searched as: 4 mm-XL hex key
- Model id:
iso2936-s4-xl
- Standard: ISO 2936:2014 · size 4 mm
Files
| Part key | Simplified |
|---|
iso2936-s4-xl | STEP |
Dimensions

| Symbol | Name | min | nom | max | Modeled | Rule | Level |
|---|
| s | Width across flats | 3.95 | 4 | 4 | 3.975 | midpoint of min–max | L2 |
| e | Width across corners | 4.43 | | 4.53 | 4.48 | midpoint of min–max | L2 |
| l1 | Long arm length, standard | | 74 | | 74 | nominal | L2 |
| l1_lim | Long arm length, standard, limits | 70 | | 74 | 72 | midpoint of min–max | L2 |
| l1_long | Long arm length, long | | 104 | | 104 | nominal | L2 |
| l1_long_lim | Long arm length, long, limits | 100 | | 104 | 102 | midpoint of min–max | L2 |
| l1_xlong | Long arm length, extra-long | | 144 | | 144 | nominal | L2 |
| l1_xlong_lim | Long arm length, extra-long, limits | 140 | | 144 | 142 | midpoint of min–max | L2 |
| l2 | Short arm length | | 29 | | 29 | nominal | L2 |
| l2_lim | Short arm length, limits | 27 | | 29 | 28 | midpoint of min–max | L2 |
Drawing

As a PDF: CC-ISO2936-SZ-4.pdf.
The 4 mm-XL hex key beside the 3 mm-XL and the 5 mm-XL
The 4 mm-XL is number 5, counting from the smallest, of the 7 ISO 2936 hex keys published here, from 1.5 mm-XL to 6 mm-XL.
- Width across flats (s): 4 mm on the 4 mm-XL hex key, against 3 mm on the 3 mm-XL and 5 mm on the 5 mm-XL.
- Width across corners (e): 4.43 to 4.53 mm on the 4 mm-XL hex key, against 3.31 to 3.39 mm on the 3 mm-XL and 5.57 to 5.67 mm on the 5 mm-XL.
- Long arm length, standard (l1): 74 mm on the 4 mm-XL hex key, against 66 mm on the 3 mm-XL and 85 mm on the 5 mm-XL.
- Long arm length, standard, limits (l1_lim): 70 to 74 mm on the 4 mm-XL hex key, against 62 to 66 mm on the 3 mm-XL and 81 to 85 mm on the 5 mm-XL.
- Long arm length, long (l1_long): 104 mm on the 4 mm-XL hex key, against 93 mm on the 3 mm-XL and 120 mm on the 5 mm-XL.
- Long arm length, long, limits (l1_long_lim): 100 to 104 mm on the 4 mm-XL hex key, against 89 to 93 mm on the 3 mm-XL and 116 to 120 mm on the 5 mm-XL.
- Long arm length, extra-long (l1_xlong): 144 mm on the 4 mm-XL hex key, against 129 mm on the 3 mm-XL and 165 mm on the 5 mm-XL.
- Long arm length, extra-long, limits (l1_xlong_lim): 140 to 144 mm on the 4 mm-XL hex key, against 125 to 129 mm on the 3 mm-XL and 161 to 165 mm on the 5 mm-XL.
The 4 mm-XL hex key in its other versions
Other sizes
Documents
Sources
amesweb-iso2936, fasten-it-iso2936, iso2936-2014-sample. Full citations: the method page and this size's datasheet.
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