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.

l_min = s₁x 8 + 55 mm, e_max = s₂^0.75 , l_max = l_min x 1.4

Lengths of Wrenches and Thickness of the Heads
s₁ x s₂	l_min	l_max	e_max
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	l_min	l_max	e_max

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