mechanical engineering Mechanical engineering is the study of physical machines and mechanism (engineering), mechanisms that may involve force and movement. It is an engineering branch that combines engineering physics and engineering mathematics, mathematics principl ...

, the thread angle of a

screw A screw is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to the screw head, head. The most common uses of screws are to hold objects together and there are many forms for a variety ...

is the included angle between the thread flanks, measured in a plane containing the thread axis.. This is a defining factor for the shape of a

screw thread A screw thread is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a ''straight'' thread and t ...

. Standard values include:

References

Notes

Bibliography

*. * {{MachinerysHandbook25e Screws Metalworking terminology Threading (manufacturing)