All tolerances are plus and minus.
M5 bolt head size.
But neither the external threads of the bolt nor the internal threads of the nut are exactly 500 in diameter.
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The shank size of bolts affixed into a solid surface can be determined by measuring the head s dimension and dividing by 1 8.
The width of the hexagon nuts across flats s is specified in iso 898 2 table a 1 for bolt sizes m5 to m39.
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The diameter between flat sections on a structural metric bolt s head is always 1 8 times the diameter of its shank.
Width of nut across flats.
10 8 6 m14 21.
Nominal diameter is more of a label than a size.
Metric hex nut dimensions calculator.
In fact the bolt diameter is a little smaller and the nut diameter a little larger.
M3 m3 5 m4 m5 m6 m7 m8 m10 m12 m14 m16 m18 m20 m22 m24 m27 m30 m33 m36 m39.
Non preferred threads according to standard.
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An m10 bolt with a 10 mm shank features a hex head that s 16 mm across.
Bolt diameter head and wrench size.
For example a bolt and nut may be described as being diameter.
For typical coarse pitch thread bolts the standard sizes are.
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Nominal screw sizes m5 and larger have six drilled holes spaced 60 degrees apart unless the purchaser specifies two drilled holes.
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Us bolt head wrench size.
The m3 and m4 nominal screw sizes have two drilled holes spaced 180 degrees apart.
Other usually smaller sizes may occur for reasons of weight and cost reduction.
Drilled head metric hexagon socket head cap screws normally are not available in screw sizes smaller than m3 nor larger than m36.
All dimensions are given in millimeters.
Hex head widths width across flats spanner size are for din 934 hex nuts and hex head bolts.
M5 8 8 4 3 2 5 m6 10 10 5 4 3 m7 11 11 m8 13 13 6 5 4 m10 16.