Changing levels of certain substances in the blood, such as sodium, can cause confusion. Increased heart rate...heart palpitations, which feel like your heart is racing or throbbing. To make up for the loss in pumping capacity, the heart beats faster.
The pitch plane of a pair of gears is the plane perpendicular to the axial plane and tangent to the pitch surfaces. A pitch plane in an individual gear may be any plane tangent to its pitch surface.
In the example 20mm includes the head height. measured like this because the bottom of the head. has a chamber. below. Here is a list of common thread pitches in my store: Pitch means how fine or coarse the actual threads are. All bolts are these pitches unless otherwise specified.