Metric spanners relate to the gap between the jaws in mm and therefore
equate to the dimension across the flats of the nut.
Look
here for metric tap and drill sizes
|
Thread
Size
|
Spanner
Size
mm
|
Pitch
|
|
M
= mm dia.
|
Std.
ISO
|
Jap.
|
Std.
|
Fine
|
Jap.
|
4
5
6
7
8
9
10
12
14
16
18 |
7
8
10
11
13
14
17
19
22
24
27 |
-
-
-
-
12
-
14
-
-
-
- |
0.70
0.80
1.00
1.00
1.25
1.25
1.50
1.75
2.00
2.00
2.00 |
-
-
-
-
1.00
-
1.00
1.50
1.50
1.50
1.50 |
-
-
-
-
1.25
-
1.25
-
-
-
- |
|
Thread
Size
|
Spanner
Size
mm
|
Pitch
|
For metric
conversions go to a unit starting with
-
a
b c
d e
f g
h i
j k
l m
n o
p q
r s
t u
v w
y
