INTRODUCTION
Inch lock nuts, all metal (three optional methods)
20090268
4
Grade identification
Grade
Corner marking method (1)
Flats marking method (2)
Clock marking method (3)
Grade A
No notches
No mark
No marks
Grade B
One circumferential notch
Letter B
Three marks
Grade C
Two circumferential notches
Letter C
Six marks
48144025 23/06/2017
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