February 2013 Newsletter: Back to the Basics: Thread Height

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External Thread Height Gage
Inspecting a Part
Back to the Basics:

Thread Height

Heighten Your Quality

What is it?

Found on all thread types and sizes, Thread Height is the distance between the crest and the root when measured perpendicular to the pitchline.

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Why should you measure it?
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First of all, if you fall under API requirements, thread height is a required inspection. Also, your industry association or regulations may require it. Regardless of any regulation or standards, Gagemaker highly recommends the practice, and here’s why:
Thread Height affects the interchangeability of parts.
Thread Height affects the basic integrity of the entire thread assembly. A shallow height may cause the mated connection to pull apart when under stress.
Incorrect Thread Height may indicate chipped cutting inserts or other issues with your equipment.
Thread Height can help you determine a major or minor diameter if you know one and not the other. For example, you can subtract two times the thread height from a known major diameter to find an unknown minor diameter.
Basically, ThrTH3006oncasingead Height is a simple, quick inspection that can provide a lot of information on the strength of your part and your equipment.

How do you measure it?

Take a look at this quick video clip of a Thread Height Gage inspecting a part:

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Look for more Gagemaker’s Back to the Basics in the months ahead!
Thread Height Gages
Functional Thread Size Gages
Pitch Diameter Size Gages
Thread Lead Gages
Thread Profile Templates
Functional Rolls
Pitch Diameter Ball Contacts
TDWIN Thread Calculation Software
MIC TRAC 3000 Series

Related Articles:
Gage Tips
Gagemaker White Paper
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Gagemaker, LP develops and manufactures innovative precision mechanical inspection equipment for the Oilfield, Automotive and General Machining industries. Recognized as the leading provider of Tapered & Straight Thread Measurement Gages; API Products, Tubing and Casing Gages, Engineering Software and Calibration Software & Equipment, Gagemaker products are used in countless facilities around the world.