The diameter between flat sections on a structural metric bolt s head is always 1 8 times the diameter of its shank.
M5 bolt head size.
Non preferred threads according to standard.
10 8 6 m14 21.
Other usually smaller sizes may occur for reasons of weight and cost reduction.
All dimensions are given in millimeters.
Metric hex nut dimensions calculator.
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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 shank size of bolts affixed into a solid surface can be determined by measuring the head s dimension and dividing by 1 8.
Hex head widths width across flats spanner size are for din 934 hex nuts and hex head bolts.
For example a bolt and nut may be described as being diameter.
The axis of the head shall be located at a true position relative to the axis of the screw shank within a tolerance zone having a diameter equivalent to 6 of the specified maximum head diameter or the specified maximum width across flats of hex and hex flange heads regardless of feature size.
Nominal screw sizes m5 and larger have six drilled holes spaced 60 degrees apart unless the purchaser specifies two drilled holes.
Nominal diameter is more of a label than a size.
Bolt diameter head and wrench size.
Hex bolt lag bolt.
Width of nut across flats.
Us bolt head wrench size.
For typical coarse pitch thread bolts the standard sizes are.
The m3 and m4 nominal screw sizes have two drilled holes spaced 180 degrees apart.
All tolerances are plus and minus.
In fact the bolt diameter is a little smaller and the nut diameter a little larger.
Drilled head metric hexagon socket head cap screws normally are not available in screw sizes smaller than m3 nor larger than m36.
But neither the external threads of the bolt nor the internal threads of the nut are exactly 500 in diameter.
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8 6 5 m12 18.
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