Some beam tracks can only use metric fasteners; see table for details. The moment of inertia is used to calculate
the stiffness of material section. All track is extruded from Aluminum 6068T6.
Beam track is available from size 0 to 3 and is used when spanning cockpits and across companion way hatches.
Three fixing bolts should always be used on either side of the span and washers fitted under the head of the bolt
and between track and deck.