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5. Glossary
Apex; apex
Zone separating the sheaths of the two screws when they are not interpenetrated.
Self-cleaning; self-wiping
Characteristic of a geometry where the surface of one screw perfectly matches the surface of the neighboring screw.
Nombre de filets ; number of flights
This is the number of screw threads starting from a section perpendicular to the axis and winding around the screw. In practice, single-, double- and triple-thread screws are available.
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