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TORNILLO PRISIONERO, que siendo del tipo de los que funcionan por presión y pudiendo presentar cabeza allen, philips facetada, con una sola mortaja para destornillador plano, o de cualquier otra clase, se caracteriza esencialmente porque el extremo de su vástago roscado presenta un diseño troncocónico, estando dotada la superficie lateral de dicho extremo de una pluralidad de nervaduras de trazado helicoidal de gran paso y encontrándose rehundida la base libre menor del tronco de cono de manera que su periferia quede en un plano diferente al resto de su superficie.