What is a thread?

The screw is the type of fastening element used to connect wood, metal and composite materials. While the nails have a smooth stem, the screws have a range of grooves or fibers along the length of the stem. These fibers bit into the material when installing and help create a safe bond. The screw thread can be used to distinguish the types of screws apart and also to determine where the screw should be used. In general, a fully pushed screw is designed for metal, while the fiber is partially designed for wood. The screw thread can be either right or left -handed and is determined in the direction that the installation screw must turn during the installation. Most are right -handed and must be turned clockwise, but several elements of left -handed fibers for special applications. The first is the size of the screw or the outer diameter that measures the diameter around the outer fibers. This measurement determines which size opening the screw can be used. The second feature to consider is a playground that measures the number of fibers per thumb or millimeter. It is said that screws with a large number inThey have a "fine" spacing, while those with several fibers are said to have a "rough" playground.

Thread sizes

screw threads are measured using two basic systems around the world. In the United States and Canada, the sizes of the screw threads are listed using the unified fiber (UTS) standards. These sizes are listed as a series of two numbers, the first shows the nominal diameter and the second showing the pitch in the thumb on the thumb. For example, UTS '3/8' x 16 'measures that the screw measures three eighths of the inch around the fiber outside and has 16 fibers per inch.

Most people in the world are relied on the size of the screw threads created by an international organization for standards (ISO). The ISO screw measurement always starts with the letter "M" followed by two numbers. The first of these numbers shows the outer diameter and the second shows the pitch. For example, a screw listed as the M10 x 1.5 measures 10 millimeters around the outer side of the fibers and has a pitch 10 fibers per millimeter. Many wooden and hardware stores provide information about screw size using both of these systems or provides a chart so people can easily move between two systems.