For typical coarse pitch thread bolts the standard sizes are.
M8 bolt head size in mm.
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Here s what the description means.
There is an exception though if pitch isn t specified the fastener is coarse threaded.
Brass aluminum steel parts.
For nuts size will appear as diameter and pitch.
Drilled head metric hexagon socket head cap screws normally are not available in screw sizes smaller than m3 nor larger than m36.
M3 5 and larger threads are tapped thru 25 4 mm in lengths.
The nominal diameter d is specified in mm as part of the bolt designation e g.
Stainless steel nylon parts.
Available in a range of sizes from m2 to m42 and din 933.
M2 5 thread is tapped thru 15 99 mm in length.
The size of a metric screw or bolt is specified as diameter pitch and length in millimeters millimeters is abbreviated mm.
A metric iso screw thread is designated by the letter m followed by the value of the nominal diameter d the maximum thread diameter and the pitch p both expressed in millimetres and separated by the hyphen sign e g m8 1 25.
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If the pitch is the normally used coarse pitch listed in iso 261 or iso 262 it can be omitted e g m8.
Metric bolt head wrench size.
M3 and larger thread is tapped thru 25 4 mm in length.
Bolt diameter mm head wrench size mm ansi iso din.
M2 5 thread is tapped thru 9 6 mm in length m3 thread is tapped thru 12 7 mm in length.
M8 is the designation for a metric m sized bolt or screw that is 8mm 8 in diameter.
The m3 and m4 nominal screw sizes have two drilled holes spaced 180 degrees apart.
8 mm for m8 bolt.
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M3 m3 5 m4 m5 m6 m7 m8 m10 m12 m14 m16 m18 m20 m22 m24 m27 m30 m33 m36 m39.
Consider this size m8 1 0 x 20.
Nominal screw sizes m5 and larger have six drilled holes spaced 60 degrees apart unless the purchaser specifies two drilled holes.