“Cam-out”? “Prevailing torque”? We will explain the terminology related to screws

thread forming screw (self-tapping screw)	Screws that can be screwed into unthreaded holes (pre-drilled holes) while allowing the screw itself to plastically form the female thread.
self-tapping (thread forming)	Threading a female thread into a mating material while allowing it to be plastically formed.
mating material (work piece)	A member with a female screw or pre-drilled hole that is tightened with a screw to fasten the member.
fastening component (clamped part)	A component or part that is inserted between the head of a tapping screw and the mating material.
pilot hole diameter	Diameter of mating material preparation hole required for self-tapping
thrust loading additional axial force	Thrusting force in the axial direction of a screw when fastening a screw
cam out	Insufficient force (thrust) to push the screw forward, causing the bit to lift off the crosspiece
recess ream stripped screw head	Cross-holes are crushed when tightening the cross-holes with a bit
torsional strength (tightening breakage torque)	Torque when twisting and breaking the screw itself
tightening torque	The torque required to screw a screw to obtain a given tightening force.
driving torque	The maximum value of torque required for a tapping screw to form a female thread in a mating material's downhole.
(thread) stripping torque	The maximum torque that can be applied to a thread or male screw molded into a mating material before it is broken.
drive-to-strip torque ratio	Ratio of starting torque to tightening breaking torque (minimum value of stripping torque / maximum value of driving torque)
loosening torque	Maximum torque required to loosen a screw after tightening to a specified tightening torque
torque ratio of tightening loosening	Ratio of Tightening Torque to loosening Torque (loosening torque / Tightening torque)
axial tension (axial force)	The force applied in the axial direction of the screw, the strength of the fastening that compresses the fastening component.
withstanding axial external force	The maximum external force that a molded thread or male thread can withstand without breaking when an external force is applied in the axial direction from the opposite direction of the screwing in of a fastener fastened with a tapping screw.
prevailing torque	Frictional torque generated by interference between the threaded part of a male screw and female screw.
taper	An imperfectly threaded part where the threads are gradually reduced to improve screw threading performance at the tip of the screw.
plain sheared end (blunt end)	The tip of the male screw, without the tapered section, as it is after thread rolling
lead angle	The angle formed by the screw axis and the helix (screw thread line).
pitch	The distance between adjacent screw threads
double-start thread	A screw with two helix (screw threaded line) that advances two pitches per rotation.
percentage of thread engagement	The ratio of the height of the female screw thread (female screw thread height) to the height of the male screw thread (male screw thread height)