Transcript Bolt Identification

How to Identify a Bolt
The parts of a Bolt
A Scale (or Ruler) is used to
determine the dimensions of a
bolt.
One Side is Inches and the
other is Millimeters
th
16
The
Scale is easier than
the 32nd Scale for measuring
Fractional bolts.
Step 1

Determine if the bolt is Metric or Standard
Is this metric or standard
Is this metric or standard?
Step 2 is to determine the
Size

Size means the diameter of the bolt across
the threads.
What is the size of this
standard bolt?
What is the size of this metric
bolt?
Step 3 is to determine the
thread pitch.

Pitch means the number of threads per inch
for a standard bolt.
 Pitch means the distance between threads
for a metric bolt.
Thread pitch is measured with
a thread pitch gage
What is the pitch of this metric
bolt?
What is the pitch of this
standard bolt?
Step 4 is to measure the
length

Length is measured from the bottom of the
head to the end of the thread
What is the length of this
standard bolt?
What is the length of this
metric bolt?
The 5th step is to determine
the Head size.

Head size is measured from flat to flat.
What is the head size of this
metric bolt?
What is the head size of this
standard bolt?
If the threads are damaged
what tool is used to repair
them?
Die
Die Size

Standard Die
Example:
Metric Die
Example:
Size – Pitch
3/8 – 14
Size – Pitch
10 X 1.25
Head Size
Standard Bolt Sizing
Metric Bolt Sizing
8.8