"spanner-type bolting "出现在API618-2007的6.2.3中,全段是: 1 t9 E( H# B0 L+ S: b6.2.3 Internal socket-type, slotted-nut, or spanner-type bolting shall not be used unless specifically approved by the purchaser.1 M+ o2 D: g; g
Note: For limited space locations, an integrally flanged fastener may be required.