"spanner-type bolting "出现在API618-2007的6.2.3中,全段是: 4 s6 Q- a4 \# [: b: C' R6.2.3 Internal socket-type, slotted-nut, or spanner-type bolting shall not be used unless specifically approved by the purchaser.6 d* W8 k$ k7 e6 g
Note: For limited space locations, an integrally flanged fastener may be required.