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 pin portion 15 of {HEAD ~ the next adjacent drill pipe section} adjoining {TAIL ~ the female end} 13 is to be inserted to couple the pipe section together 
adjoining
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 pin portion 15 of { HEAD ~ the next adjacent drill pipe section } adjoining { TAIL ~ the female end } 13 is to be inserted to couple the pipe section together
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