The female coupling end portion likewise has a female end collar formation 16 surrounding a female threaded section or socket portion 17 into which the threaded nose or {HEAD ~ pin portion} 15 of {TAIL ~ the next adjacent drill pipe section} adjoining the female end 13 is to be inserted to couple the pipe section together 
The female coupling end portion likewise has a female end collar formation 16 surrounding a female threaded section or socket portion 17 into which the threaded nose or { HEAD ~ pin portion } 15 of { TAIL ~ the next adjacent drill pipe section } adjoining the female end 13 is to be inserted to couple the pipe section together
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH