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.
That number of threads required times the pitch gives the depth required. IF the question means how do you decide the tapping hole diameter this varies with the thread system-so look it up in a book or chart. If you are asking this about a metric series thread-subtract the thread pitch from the screw OD. In theory the tapping hole is 95%, but in practice a screw thread is under-size and drill will drill sufficiently oversize to just use the 100% number. You can do the same 'simple subtraction' with Imperial 60Â° threads by first converting OD and pitch to metric. __________________.