The female coupling end portion likewise has a female end collar formation 16 surrounding {TAIL ~ a female threaded section} or {HEAD ~ socket portion} 17 into which the threaded nose or pin portion 15 of 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 { TAIL ~ a female threaded section } or { HEAD ~ socket portion } 17 into which the threaded nose or pin portion 15 of 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 TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH