As shown, the male coupling end includes {HEAD ~ an enlarged collar formation} 14 over a short distance, for example several inches, spaced from the tip of {TAIL ~ the male coupling end} and a threaded, somewhat conical, nose portion 15 protruding therefrom, sometimes referred to as the pin, adapted to be mated with a female coupling end 13 of the next adjacent drill pipe section 
As shown , the male coupling end includes { HEAD ~ an enlarged collar formation } 14 over a short distance , for example several inches , spaced from the tip of { TAIL ~ the male coupling end } and a threaded , somewhat conical , nose portion 15 protruding therefrom , sometimes referred to as the pin , adapted to be mated with a female coupling end 13 of the next adjacent drill pipe section
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