Quantcast C-6.  FASTENER  GRADE

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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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