FASTENER GRADE - TM-9-2330-202-14-P0386

TM 9-2330-202-14&P

H-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 H-5).

Table H-5. SAE Screw and Bolt Markings

SCREWS

BOLTS

SAE GRADE 2

SAE GRADE 6

NO MARKING

4 RADIAL DASHES

90 APART

SAE GRADE 3

2 RADIAL DASHES

SAE GRADE 7

180 APART

5 RADIAL DASHES

72 APART

SAE GRADE 5

3 RADIAL DASHES

SAE GRADE 8

120 APART

6 RADIAL DASHES

60 APART

Markings on Hex Locknuts

GRADE A - No Marks

GRADE B - 3 Marks

GRADE B - Letter B

GRADE C - 6 Marks

GRADE C - Letter C

GRADE A - No Notches

GRADE B - 1 Notch

GRADE C - 2 Notches

H-5/(H-6 blank)