HEX SOCKET SCREW KEY CHART


Metric hexagon socket screw keys sizes and dimensions chart according to ISO 2936:2001 standard.


Dimensions of Hex Keys and Bits
Metric Hexagon Socket Screw Key
s e l1 l2
nom. max. min. max. min. Standard Long Extra-long Limit
Dev.
Limit
Dev.
0.7 0.71 0.70 0.79 0.76 33 - - 0
-2
7 0
-2
0.9 0.89 0.88 0.99 0.96 33 - - 11
1.3 1.27 1.24 1.42 1.37 41 63.5 81 13
1.5 1.50 1.48 1.68 1.63 46.5 63.5 91.5 15.5
2 2.00 1.96 2.25 2.18 52 77 102 18
2.5 2.50 2.46 2.82 2.75 58.5 87.5 114.5 0
-4
20.5
3 3.00 2.96 3.39 3.31 66 93 129 23
3.5 3.50 3.45 3.96 3.91 69.5 98.5 140 25.5
4 4.00 3.95 4.53 4.44 74 104 144 29
4.5 4.50 4.45 5.10 5.04 80 114.5 156 30.5
5 5.00 4.95 5.67 5.58 85 120 165 33
6 6.00 5.95 6.81 6.71 96 141 186 38
7 7.00 6.94 7.94 7.85 102 147 197 0
-6
41
8 8.00 7.94 9.09 8.97 108 158 208 44
9 9.00 8.94 10.23 10.10 114 169 219 47
10 10.00 9.94 11.37 11.23 122 180 234 50
11 11.00 10.89 12.51 12.31 129 191 247 53
12 12.00 11.89 13.65 13.44 137 202 262 57
s e l1 l2
nom. max. min. max. min. Standard Long Extra-long Limit
Dev.
Limit
Dev.
13 13.00 12.89 14.79 14.56 145 213 277 0
-7
63 0
-3
14 14.00 13.89 15.93 15.70 154 229 294 70
15 15.00 14.89 17.07 16.83 161 240 307 73
16 16.00 15.89 18.21 17.97 168 240 307 76
17 17.00 16.89 19.35 19.09 177 262 337 80
18 18.00 17.89 20.49 20.21 188 262 358 84
19 19.00 18.87 21.63 21.32 199 - - 89
s e l1 l2
nom. max. min. max. min. Standard Long Extra-long Limit
Dev.
Limit
Dev.
21 21.00 20.87 23.91 23.58 211 - - 0
-12
96 0
-5
22 22.00 21.87 25.05 24.71 222 - - 102
23 23.00 22.87 26.16 25.86 233 - - 108
24 24.00 23.87 27.33 26.97 248 - - 114
27 27.00 26.87 30.75 30.36 277 - - 127
29 29.00 28.87 33.03 32.59 311 - - 141
30 30.00 29.87 34.17 33.75 315 - - 142
32 32.00 31.84 36.45 35.98 347 - - 157
36 36.00 35.84 41.01 40.50 391 - - 176

Symbols: s = Width across flats, e = Width across corners

Reference:

  • ISO 2936:2001 , Assembly Tools For Screws And Nuts — Hexagon Socket Screw Keys