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TM 9-2350-287-34
C-6. FASTENER GRADE.
In addition to being classified by thread type, thread fasteners are also classified by material. The most familiar
fastener classification system is the SAE grading system (Table C-5).
Table C-5. SAE Screw and Bolt Markings
SCREWS
BOLTS
SAE GRADE 6
SAE GRADE 2
4 RADIAL DASHES
NO MARKINGS
90° APART
SAE GRADE 3
SAE GRADE 7
2 RADIAL DASHES
5 RADIAL DASHES
180° APART
72° APART
SAE GRADE 5
SAE GRADE 8
6 RADIAL DASHES
3 RADIAL DASHES
120° APART
60° APART
Markings on Hex Locknuts
GRADE A -No Marks
GRADE A - No Mark
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 Notxhee
C-5/(C-6 blank)
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