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