TM 9-2350-256-20-2
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5.
Fastener Grade
In addition to being classified by thread type, threaded fasteners are also classified by material. The most familiar fastener
classification system is the SAE grading system (see Table 5).
Table 5. SAE Screw and Bolt Markings
Screws
Bolts
SAE Grade 2
SAE Grade 6
No Marking
4 Radial Dashes
90 Apart
SAE Grade 3
SAE Grade 7
2 Radial Dashes
5 Radial Dashes
180 Apart
72 Apart
SAE Grade 5
SAE Grade 8
3 Radial Dashes
6 Radial Dashes
120 Apart
60 Apart
NOTE
The following is a listing of various manufacturer markings on hex locknuts:
1.
Grade A--No Marks/No Notches/No Letter
1.
Grade B--3 Marks/One Notch/Letter B
1.
Grade C--6 Marks/Two Notches/Letter C
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