What is a line angle?

Various nuts, bolts and screws.

Thread angle is a measure of the degree of angle between individual threads on a bolt. These threads consist of teeth or cuts made in the shank of a screw or stud. By cutting the teeth at an angle, manufacturers can increase the holding power of the screw. Changes in the angle of the thread also determine how easily the screw can be installed in certain types of material. Based on these factors, contractors consider angle when choosing screws to find the best fastener types for each application.

Most screws with a V-shaped thread design are cut at a 60 degree angle to each other.

Many types of screws are cut to a standard angle, which is based on industry standards for this type of fastener. For example, most screws with a V-shaped thread design are cut at a 60 degree angle to each other. This is true of all fasteners used in the United States. and the UK, as well as any other countries that rely on the Unified Threading Standard, or UTS. This 60 degree angle is usually identified by the letter M, which can be found on the screw packaging and in the screw identification tables. A 60 degree angle was chosen because it provides a balance of holding power and ease of installation for a large number of projects.

Most metal and plastic pipes feature a 55 degree thread angle, which serves as an industry standard for pipes under the UTS. These tubes feature an angle identification of G, which is associated with an angle of 55 degrees. Some special screws and fasteners may also utilize a 55 degree angle, which is based on the traditional Whitworth screw identification system. These fasteners are identified by the letter W and may include screws and nuts used on bicycles and some special vehicles.

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Screws with a rounded or hinged-thread design usually feature a 30 degree angle. This shallow angle is also used on Acme or square-toothed wires, as well as those with a trapezoidal shape. Buttress wires, which have a square side and a slanted side, typically have an angle between 30 and 45 degrees. All fasteners with completely square threads are considered to have a zero angle.

Users can measure the thread angle using a special tool known as a micrometer. You can also calculate thread angles based on other bolt measurements, such as thread diameter or the number of threads per inch. Based on this information, screw manufacturers can determine how many threads are needed and where to make cuts along the shank to obtain the desired angle.

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