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Metric Bolt Sizes

There are many products all over the globe that are measured with metric, instead of inch measurements. Such kinds of products include the likes of drill bits, screws, bearings, fasteners and metric bolts. Metric Bolt Sizes are specified as length, pitch and diameter, in millimeters. Metric bolt sizes chart lists all the different sizes in which metric bolts are available. The sizes in which these metric bolts are available, will be based on the manufacturer and the seller of them.

Today, one can find many websites in which there are metric bolt sizes explained in complete detail. Metric bolts are made in such a way that they are just a fraction short of their stated size. So, when taking into consideration M16 bolt dimensions, such a bolt will have a shank diameter that is almost always equal to 15.97 mm. What this really means is that, a 16 mm bolt will be able to go through a 16 mm hole, but it is always advisable to drill slightly bigger holes, so as to allow for misalignment between parts.

As there are many different types of metric bolts that are available, as such there is a different spanner size for metric bolts and details of these spanner sizes can easily be got from the World Wide Web. Information on the many kinds of metric bolt head sizes, as well as on hex head bolt dimensions metric, can easily be found out from the many websites that deal with these kinds of products. Metric Bolt Sizes are many and the different sizes in which these are available, can be obtained online, from the websites of different manufacturers of these kinds of bolts.

Metric Bolt Head/Wrench Size

Bolt Diameter
(mm)
Head/Wrench Size
(mm)
ANSI/ISO DIN JIS DIN/ISO
Heavy Hex
4 7 7 7 -
5 8 8 8 -
6 10 10 10 -
7 - 11 - -
8 13 13 12 -
10 16 17 14 -
12 18 19 17 22/21*
14 21 22 19 -
16 24 24 22 27
18 - 27 - -
20 30 30 - 34/32*

ANSI - American National Standards Institute
ISO - International Organization for Standardisation
DIN - Deutsches Institut für Normung
JIS - Japanese Industrial Standard
* Indicates ISO standard.

 

Metric Hex Bolt Dimensions

Metric Hex Bolt Dimensions

**All measurements in millimeters**

NOMINAL SIZE (D) BODY DIAMETER HEAD THICKNESS ACROSS THE FLATS ACROSS CORNERS
D (MAX) D (MIN) H (MAX) H (MIN) F (MAX) F (MIN) C (MAX) C (MIN)
m10 10.00 9.78 6.63 6.17 17.00 15.73 18.48 17.77
m12 12.00 11.73 7.76 4.24 19.00 17.73 20.78 20.03
m14 14.00 13.73 9.09 8.51 22.00 20.67 24.25 23.35
m16 16.00 15.73 10.32 9.68 24.00 23.67 27.71 26.75
m20 20.00 19.67 12.88 12.12 30.00 29.16 34.64 32.95
m24 24.00 23.67 15.44 14.56 36.00 35.00 41.57 39.55
m30 30.00 29.67 19.48 17.92 46.00 45.00 53.12 50.85
m36 36.00 35.61 23.38 21.63 55.00 53.80 63.51 60.79
m42 42.00 41.38 26.97 25.03 65.00 62.90 75.06 71.71
m48 48.00 47.38 31.07 28.93 75.00 72.60 86.60 82.76
m56 56.00 55.26 36.2 33.80 85.00 82.20 98.15 93.71
m64 64.00 63.26 41.32 38.68 95.00 91.80 109.70 104.65
m72 72.00 71.26 46.45 43.55 105.00 101.40 121.24 115.60
m80 80.00 79.26 51.58 48.42 115.00 111.00 132.72 126.54
m90 90.00 89.13 57.74 54.26 130.00 125.50 150.11 143.07
m100 90.00 99.13 63.9 60.10 145.00 140.00 167.43 159.60