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TM 10-4320-351-14
H-3
GENERAL TORQUE DATA.
BOLT STRENGTH IDENTIFICATION, ENGLISH SYSTEM
Grade 1 or 2
Grade 5
Grade 8
Identification marks correspond to bolt strength - increasing number of slashes represent increasing strength.
BOLT STRENGTH IDENTIFICATION, METRIC SYSTEM
Identification class numbers correspond to bolt strength - increasing numbers represent increasing strength.
HEX NUT STRENGTH IDENTIFICATION
English System
Metric System
Grade
Identification
Grade
Identification
Hex Nut
Grade 5
3 Dots
Hex Nut
Property
Class 9
Arabic 9
Hex Nut
Grade i
6 Dots
Hex Nut
Property
Class 10
Arabic 10
Increasing dots represent increasing strength
Increasing numbers represent increasing strength
H-2
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