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AIR1936A - Study of Wrenching Engagement on AS870C Double Hexagon (12 Point) Fasteners

Details
Document Number: AIR1936A
Revision Number: A
Title
Study of Wrenching Engagement on AS870C Double Hexagon (12 Point) Fasteners
Scope
This study addresses the adequacy of sockets, wrenches, and torque adapters conforming to AS954 to wrench 12 point fasteners with wrenching configurations conforming to AS870C. Reported wrenching problems with smaller sizes are investigated through examining the combined tolerances on the fasteners and wrenches, conducting torque testing on typical high strength lock nuts. Possible solutions to correct these wrenching problems are presented.
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