"spanner-type bolting "出现在API618-2007的6.2.3中,全段是:9 K* ?! S$ k3 J* k' ?/ z% H
6.2.3 Internal socket-type, slotted-nut, or spanner-type bolting shall not be used unless specifically approved by the purchaser. 9 u7 A4 x' C. r* \: I @2 M3 lNote: For limited space locations, an integrally flanged fastener may be required.