These are heat fitted together to form {HEAD ~ an annular blank} which is then machined to form {TAIL ~ an axial bore} therein and end faces normal to the bore 
is machined to form
These are heat fitted together to form { HEAD ~ an annular blank } which is then machined to form { TAIL ~ an axial bore } therein and end faces normal to the bore
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH