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ISO Metric Wrench Bolt Size Table Chart

 
This table chart defines the standard ISO metric wrench size for Metric Hex Head Bolts.
 
ISO Metric Wrench Hex Drive Size mm
Bolt Nominal
Diameter mm
ANSI/ISO
& ASME
DIN
JIS
ISO/DIN
Heavy Hex
4
7
7
7
-
5
8
8
8
-
6
10
10
10
-
7
-
11
-
-
8
13
13
12
-
10
15 / 16 a
17
14
-
12
18
19
17
22 / 21 a
14
21
22
19
-
16
24
24
22
27
18
-
27
-
-
20
30
30
-
34 & 32

ANSI - American National Standards Institute
ASME - American Society of Mechanical Engineers
ISO - International Organization for Standardisation
DIN - Deutsches Institut fur Normung
JIS - Japanese Industrial Standard
a - Indicates ISO standard.

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