Bolt Head Size Metric

The bolt chart provides both us and metric stud sizes.

Bolt head size metric.

Metric stud bolt to nut size chart. The head makes 12 points of contact with a wrench to handle more torque than a socket head or hex head screw. All tolerances are plus and minus. Hex bolt head dimensions.

The m3 and m4 nominal screw sizes have two drilled holes. 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. The diameter between flat sections on a structural metric bolt s head is always 1 8 times the diameter of its shank.

An m10 bolt with a 10 mm shank features a hex head that s 16 mm across. Unc and unf unified inch screw threads ansi asme b1 1 unified national thread unc coarse series and unf fine series. 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.

Threaded bolt stress area threaded bolts tensile stress area. Definitions of terms are located below the chart. Length is measured from under the head to the end of the bolt note. Use the dimensions of your bolt to determine the appropriate size nut.

Stainless nuts and bolts. The shank size of bolts affixed into a solid surface can be determined by measuring the head s dimension and dividing by 1 8. Square neck carriage bolts medium strength metric class 8 8. Our metric stud bolt to nut table is meant to help determine the correct size bolt or nut for your purpose.

Us bolts head and wrench sizes hex bolt lag bolt square bolt and heavy hex bolt. Head sizes may differ from what is shown due to differences between metric standards length. All dimensions are in millimeters. T slots and t nuts metric sizes standard metric t slots and t nuts.

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 bolt head wrench size. Drilled head metric hexagon socket head cap screws normally are not available in screw sizes smaller than m3 nor larger than m36.

Exotic materials specialty fasteners.