{TAIL ~ The height} of thread crest of {HEAD ~ the smaller diameter parallel thread part} 15 is as small as about 0.1 mm 
{ TAIL ~ The height } of thread crest of { HEAD ~ the smaller diameter parallel thread part } 15 is as small as about 0.1 mm
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH