The thread angle of a

screw A screw and a bolt (see '' Differentiation between bolt and screw'' below) are similar types of fastener typically made of metal and characterized by a helical ridge, called a ''male thread'' (external thread). Screws and bolts are used to fa ...

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, often shortened to 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 ...

. Standard values include:

References

Notes

Bibliography

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