Inch (SAE) and Metric Fasteners
M1.1
F-code Section C-code
Version no T-code
001
© BT Products
23
Service Manual 1997-09-24
Inch (SAE) and Metric Fasteners
1. Introduction
Threaded fasteners such as bolts, nuts, cap screws, and
studs are made to specifications that describe the mechanical
strength and hardness of the fastener. A fastener used in a
design application is selected in accordance with its
specifications. Parts used on this truck are purchased from
many countries. There are several standards used by these
countries in the manufacture of threaded fasteners. Many of
these fasteners are similar but cannot be used as direct
replacements.
Service persons must use replacement fasteners that have
the same specifications. Fasteners made to each
specification have identification marks for that specification.
This specification is commonly called “grade” for SAE
standards and “property” for metric standards. This section
describes the identification of some common fasteners.
The metric system used is described as SI (International
System of Units, also called SI in all languages). The SI
system of measurement is described in ISO Standard 1000,
1973.
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