Strength Identification - prime mover smx45 Master Service Manual

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3. Strength Identification

The most common property classes for metric fasteners are
8.8 and 10.9. The property class is marked with a number on
the head of the cap screw or on a nut. Property classes less
then 8.8 are often not marked. Grades for inch bolts go from 2
to 8. Grade 2 fasteners normally do not have marks. The
following tables show marks that identify grades and property
classes for different fasteners.
When fasteners must be replaced new
WARNING
fasteners must be of same strength or
greater than original fasteners. The new
fasteners must also be the correct size.
NOTE! Identification marks are according to bolt
strength. The higher the number, or
increase in number of marks, indicates
increased bolt strength.
Master Service Manual 2004-01-12
F-code Section
PT M1.1
Inch (SAE) and Metric Fasteners
Version no T-code
001 SMX
C-code
41