Hexagonal Screw Diameters

The first number is the screw gauge and is a fraction that can be quickly referenced on a handy chart. The next number is the head diameter and then the shank diameter.

The ‘M’ apparently stands for Metric, and the rest of the number indicates the diameter of the threaded portion of the screw (or bolt). This value is used to help engineers match the right size screws to the job.
Hexagon

The hexagonal shape is found in many types of structures, including the honeycomb inside a beehive, the football’s face and floor tiles. It’s also a common shape in 2D geometry, where it can be classified into several types based on the length of its sides and the measure of its angles. The two main types of hexagons are regular and irregular. They can also be concave or convex.

Screws can be categorized into different sizes based on their head and shank diameters. The first number listed on a screw size chart is the screw diameter, which must match the diameter of the matching nuts and washers. The second number, which is separated by a hyphen, refers to the number of threads per inch on the screw shaft. For example, a screw sized #6-32 has 32 threads per inch on its shaft.

Hexagonal Shape
The simplest way to categorize a hexagon is by its sides and angles. If all its sides are equal and each of its interior angles measure 120 degrees, a hexagon has perfect regular symmetry. If a hexagon has more than six vertices or its interior angles are not equal, it is an irregular hexagon.

Hexagonal Symmetry
All hexagons have at least three lines of symmetry. The simplest way to find a hexagon’s line(s) of symmetry is to fold it in half horizontally, then in half vertically and ensure that all its corners are perfectly matched. This is called reflection symmetry. The more lines of symmetry a hexagon has, the more complex its design is.

Hexagon Angles
All polygons have interior and exterior angles. Interior angles are the angles formed at a point where two sides meet, and they add up to 180 degrees. Exterior angles are the angles formed at each of a polygon’s vertices, and they add up to 360 degrees. A hexagon has six interior angles and six vertices.

Hexagon Sides
The sides of a hexagon can be straight or curved, but they must always be closed loops that join the six vertices. A hexagon with curved sides is a pentagon, while one with straight sides is a heptagon.

A heptagon has a circle inside, making it an inscribed or abbreviated hexagon. Heptagons are also sometimes referred to as octagons or decagons. An octagon has nine sides, and a decagon has 12 sides.6 screw diameter

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