The invention also concerns the method for making screw caps with improved unscrewing for bottles containing beverages such as soda water, mineral or natural water, aerated or not.

The invention concerns a plastic screw cap with improved unscrewing for a bottle containing in particular beverages such as soda water, mineral or natural water, aerated or not.

The coupling is useful for driving sockets and screwing/unscrewing accessories.

A spanner which enables simple and rapid removal of a loosened nut.

The tooth flanks that engage one another on loosening are nevertheless sufficiently angled to enable forced unscrewing using a spanner.

The torque values are recorded either statically at the screwing and unscrewing rest limit, or dynamically in a series of corresponding screwing and unscrewing positions.

A simple tool, such as a socket wrench, quickly unscrews the device from the mold member.

The material and the wall thickness of the smooth carrier sleeve (8) are selected in such a manner that it cannot be compressed by exertion of human force, thereby preventing unauthorised removal by screwing of the water outlet nozzle.

The use of optional serrations helps prevent the nut backing-off.

Accordingly, the unscrewing of the bolt can be completely prevented.

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The bottom edge aligning with the protrusion inhibits reverse threading or backing out of the bone screw.

Upper and lower limits for acceptable rod breakout pressures can be calculated based on the expected breakout pressure and/or rod size.

Anti-backout and low profile features (21, 22) are incorporated.