The taper bit 16 is formed at {TAIL ~ the fore end} of {HEAD ~ the smaller diameter parallel thread part} 15 
The taper bit 16 is formed at { TAIL ~ the fore end } of { HEAD ~ the smaller diameter parallel thread part } 15
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH