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T.8.2.1 Any Critical Fastener must meet, at minimum, one of the following:
a. SAE Grade 5
b. Metric Grade 8.8
c. AN/MS Specifications
d. Equivalent to or better than above, as approved by a Rules Question or at Technical Inspection
T.8.2.2 All threaded Critical Fasteners must be one of the following:
Hex head
Hexagonal recessed drive (Socket Head Cap Screws or Allen screws/bolts)
T.8.2.3 All Critical Fasteners must be secured from unintentional loosening by the use of Positive Locking Mechanisms see T.8.3
T.8.2.4 A minimum of two full threads must project from any lock nut.
T.8.2.5 Some Critical Fastener applications have additional requirements that are provided in the applicable section.