METRICS
SUBJECT
PAGE
SUBJECT
PAGE
Decimal/Metric Equivalents
Strength Identification
Chart
................................. 4
Bolts .................................
2
English/Metric Conversion
Hex Nuts
.............................. 3
Chart
................................. 5
Studs ..............................
...3
introduction
..............................
1 Tapping Screws
.........................
3
Nomenclature for Bolts
.....................
2
Thread Forming Screws
.................. 3
U-Nuts..
..............................
.
Torque Conversion Chart
................... 6
INTRODUCTION
I
Most threaded fasteners are covered by specifications that define required mechanical properties, such as
tensile strength, yield strength, proof load and hardness. These specifications are carefully considered in initial
selection of fasteners for a given application.
To assure continued satisfactory vehicle performance, replace-
ment fasteners used should be of the correct strength, as well as the correct nominal diameter, thread pitch,
length, and finish.
Most original equipment fasteners (English system or metric) are identified with markings or numbers indicating
the strength of the fastener. These markings are described in the pages that follow. Attention to these markings
is important in assuring that the proper replacement fasteners are used.
Further, some metric fasteners, especially nuts, are colored blue. This metric blue identification is in most cases a
temporary aid for production start-up, and color will generally revert to normal black or bright after start-up.
English system and metric system fasteners are available through your Ford Parts
and Service
operation.
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