New Holland T8.275 Service Manual page 19

Inch Lock Nuts, All Metal (Three optional methods)
Grade Identification
Grade Corner Marking Method (1)
Grade A No Notches
Grade B One Circumferential Notch
Grade C Two Circumferential Notches
INTRODUCTION
4
20090268
Flats Marking Method (2)
No Mark
Letter B
Letter C
47533593 01/10/2013
13
Clock Marking Method (3)
No Marks
Three Marks
Six Marks