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TM 9-2330-326-14&P
H-7. FASTENER SIZE AND THREAD PATTERN (Cont.)
Markings on Hex Locknuts:
GRADE A--No Marks
GRADE A--No Marks
GRADE B--3 Marks
GRADE B--Letter B
GRADE C--6 Marks
GRADE C--Letter C
GRADE A--No Notches
GRADE B--One Notch
GRADE C--Two Notches



 


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