INTRODUCTION
Self-locking nuts in inches, all-metal (three optional methods)
Grade A
(1)
Corner marking method: No notches
(2)
Flats marking method: No marks
(3)
Clock marking method: No marks
Grade B
(1)
Corner marking method: One circumferential notch
(2)
Flats marking method: Letter B
(3)
Clock marking method: Three marks
Grade C
(1)
Corner marking method: Two circumferential notches
(2)
Flats marking method: Letter C
(3)
Clock marking method: Six marks
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