OPEN END DOUBLE-HEADED WRENCHES DIMENSIONS SIZES CHART


Metric double-headed open end engineers' spanners (wrenches) dimensions sizes chart according to ISO 10102:2018 standard. Dimensions are in mm. The length l and thickness are based on the following formulas.

lmin = s1 x 8 + 55 mm,  emax = s20.75 , lmax = lmin x 1.4


Dimensions of Open End Wrench Sizes
Lengths of Wrenches and Thickness of the Heads
s1 x s2 lmin lmax emax
3.2 x 4 81 113 3
3.2 x 5.5 81 113 3.5
4 x 5 87 122 3.5
5 x 5.5 95 133 3.5
5.5 x 7 99 139 4.5
6 x 7 103 144 4.5
7 x 8 111 155 4.5
8 x 9 119 167 5
8 x 10 119 167 5.5
10 x 11 135 189 6
10 x 12 135 189 6.5
10 x 13 135 189 7
11 x 13 143 200 7
12 x 13 151 211 7
12 x 14 159 223 7
13 x 14 159 223 7
13 x 15 159 223 7.5
13 x 16 159 223 8
13 x 17 159 223 8.5
s1 x s2 lmin lmax emax

Symbols: e = thickness, l = length of the wrench, s1,s2 = Nominal width across flats

Reference:

  • ISO 10102:2018, Assembly tools for screws and nuts — Double-headed open-ended engineers' wrenches — Outside dimensions