BT OE35 - Inch (SAE) and Metric Fasteners; Strength Identification

Inch (SAE) and Metric Fasteners
M1.1
F-code Section C-code
Version no T-code
001
© BT Products
25
Service Manual 1997-09-24
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 the marks that identify the grades and
property classes for different fasteners.
When fasteners must be replaced the new
fasteners must be of the same strength or
greater than the original fasteners. The
new fasteners must also be the correct
size.
WARNING
NOTE!
Identification marks are according to bolt
strength. The higher the number, or the
increase in the number of marks, indicates
increased bolt strength.
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