ANSI/ASME buttress Inch screw thread is a form of thread with load angle of 7 degrees and a clearance angle of 45 deg from the normal to the axis. The basic height of thread engagement for buttress thread is 0.6p. The buttress thread form has certain advantages for the applications where high stress occurs only in one direction along the thread axis. The buttress form of thread is particularly applicable when tubular members screwed together. Breech assemblies of large guns, airplane propeller hubs and columns for hydraulic presses are some of the examples of buttress threaded rods and nuts.