In 1755, having risen to be a mate, Cook joined the Royal Navy, and after four years' service was, on the recommendation of Sir Hugh Palliser, his commander, appointed master successively of the sloop Grampus, of the Garland and of the Solebay, in the last of which he served in the St. Lawrence.
Tap Bolt vs Cap Screw. What is the difference between a tap bolt and a cap screw? A tap bolt is (typically) a fully threaded hex bolt, while a cap screw is (typically) a hex head bolt that will be installed by turning the head of the bolt (screw) instead of tightening it with a nut.
Usually nut threads have a tolerance applied to the basic profile so that it is theoretically possible for the nut thread profile to be equal to the theoretical profile. Bolt threads usually have a gap between the basic and actual thread profiles. This gap is called the allowance with inch-based threads and the fundamental deviation with metric threads. The tolerance is subsequently applied to the thread.