TM 10-4330-237-13&P
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
Hex Nut
Grade 5
Property
Class 9
Hex Nut
Hex Nut
Grade 8
Property
Class 10
Increasing dots represent increasing strength
Increasing numbers represent increasing strength
BOLT NOMENCLATURE
ENGLISH SYSTEM
METRIC SYSTEM
Example: 1/4 - 28 x 1.25
Example: M8 - 1.0 x 25
D T L
D T L
D = Diameter (inches)
L = Length (inches)
D = Diameter (millimeters)
L = Length (millimeters)
G = Grade (bolt strength)
T = Threads/inch
P = Property (bolt strength) T = Thread width (millimeters)
H-2
