lock ring 18 and wellhead hanger 12 to bias the lock ring 18 radially outward and into engaging contact with the wellhead housing 10 as illustrated in fig1 b fig7 is a side sectional view of an alternate example of a wellhead assembly 10 a where a threaded fastener 52 couples the lock ring 18 a to the wellhead hanger 12 a and provides a counter force for limiting axial movement of the lock ring 18 a with respect to the wellhead hanger 12 a the fastener 52 has an end that engages a threaded bore 54 shown formed in an outer surface of the wellhead hanger 12 a and which projects radially into the wellhead hanger 12 a the fastener 54 also extends into an opening 56 shown extending radially through the thickness of the lock ring 18 a and which has a diameter slightly greater than a diameter of an enlarged head portion of the fastener 52 to limit outward radial movement of the lock ring 18 a a parapet 58 is shown formed on an outer radial end of shoulder 26 a and which corresponds to a ledge 60 on a lower surface of the lock ring 18 a the combination of the parapet 58 and ledge 60 define an example of a radial stop 32 a accordingly the fastener 32 parapet 58 and ledge 60 combine to limit radial and axial movement of the lock ring 18 a with respect to the wellhead hanger 12.