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Buttress thread
The buttress thread form, also known as the breech-lock thread form,〔http://books.google.com/books?id=gYZIAAAAMAAJ&pg=PA141〕 refers to two different thread profiles. One is a type of leadscrew and the other is a type of hydraulic sealing thread form. The leadscrew type is often used in machinery and the sealing type is often used in oil fields.
==Buttress thread in machinery==
In machinery, the buttress thread form is designed to handle extremely high axial thrust in one direction. The load-bearing thread face is perpendicular to the screw axis.〔Barnwell, p. 163.〕 or at a slight slant (usually no greater than 7°) The other face is slanted at 45°. The resulting thread form has the same low friction properties as a square thread form but at about twice the shear strength due to the long thread base. This thread form also is easy to machine on a thread milling machine, unlike the difficult to machine square thread form. It can also compensate for nut wear using a split nut, much like the Acme thread form.〔Bhandari, p. 204.〕
Buttress threads have often been used in the construction of artillery, particularly with the screw-type breechblock.〔 They are also often used in vises, because great force is only required in one direction.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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