"spanner-type bolting "出现在API618-2007的6.2.3中,全段是:" w6 T( E3 T1 x% ?1 ]5 r( X7 _
6.2.3 Internal socket-type, slotted-nut, or spanner-type bolting shall not be used unless specifically approved by the purchaser.& g9 a2 O0 g1 T; f
Note: For limited space locations, an integrally flanged fastener may be required.