Choose from our selection of metric allen bolts including alloy steel socket head screws 18 8 stainless steel socket head screws and more.
M8 bolt head size in mm.
Nominal screw sizes m5 and larger have six drilled holes spaced 60 degrees apart unless the purchaser specifies two drilled holes.
Metric bolt head wrench size.
For typical coarse pitch thread bolts the standard sizes are.
For nuts size will appear as diameter and pitch.
Bolt diameter mm head wrench size mm ansi iso din.
M2 5 thread is tapped thru 15 99 mm in length.
The nominal diameter d is specified in mm as part of the bolt designation e g.
M3 and larger thread is tapped thru 25 4 mm in length.
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Brass aluminum steel parts.
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Consider this size m8 1 0 x 20.
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Stainless steel nylon parts.
8 mm for m8 bolt.
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This is roughly equivalent to a 5 16 bolt or screw.
There is an exception though if pitch isn t specified the fastener is coarse threaded.
The size of a metric screw or bolt is specified as diameter pitch and length in millimeters millimeters is abbreviated mm.
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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.
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.
Available in a range of sizes from m2 to m42 and din 933.
M3 5 and larger threads are tapped thru 25 4 mm in lengths.
M8 is the designation for a metric m sized bolt or screw that is 8mm 8 in diameter.
M2 5 thread is tapped thru 9 6 mm in length m3 thread is tapped thru 12 7 mm in length.
If the pitch is the normally used coarse pitch listed in iso 261 or iso 262 it can be omitted e g m8.
The m3 and m4 nominal screw sizes have two drilled holes spaced 180 degrees apart.