Bolt Head Size Metric

The diameter between flat sections on a structural metric bolt s head is always 1 8 times the diameter of its shank.

Bolt head size metric.

Use the dimensions of your bolt to determine the appropriate size nut. Length is measured from under the head to the end of the bolt note. An m10 bolt with a 10 mm shank features a hex head that s 16 mm across. Definitions of terms are located below the chart.

All tolerances are plus and minus. Head sizes may differ from what is shown due to differences between metric standards length. Stainless nuts and bolts. Us bolts head and wrench sizes hex bolt lag bolt square bolt and heavy hex bolt.

The bolt chart provides both us and metric stud sizes. Metric bolt head wrench size. 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. Bolt diameter mm head wrench size mm ansi iso din.

Print this page. All dimensions are in millimeters. Threaded bolt stress area threaded bolts tensile stress area. Hex bolt head dimensions.

Metric hex bolt diameters and thread pitches mm 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220. Where l is the total bolt length and d nom is the nominal bolt diameter. Metric socket head cap screws size table. T slots and t nuts metric sizes standard metric t slots and t nuts.

Exotic materials specialty fasteners. Engineering ansi hardware design data engineering metric hardware design data. 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 m3 and m4 nominal screw sizes have two drilled holes.

Metric stud bolt to nut size chart. Large diameter nuts and bolts. The following table of hex bolt head dimensions was adapted from asme b18 6 7m table 14 dimensions of hex head machine screws this table is used for smaller size hardware. Our metric stud bolt to nut table is meant to help determine the correct size bolt or nut for your purpose.

The head makes 12 points of contact with a wrench to handle more torque than a socket head or hex head screw.