Inch locknuts, all metal (three optional methods)
Grade Identification
Grade Corner Marking
Method (1)
Grade
No Notches
A
Grade
One
B
Circumferential
Notch
Grade
Two
C
Circumferential
Notches
7 - MAINTENANCE
Flats Marking
Clock
Method (2)
Marking
Method (3)
No Mark
No Marks
Letter B
Three Marks
Letter C
Six Marks
7-5
4
20090268