There are two different common threads widely used on abrasive blast nozzles and blast nozzle holders. We generally called them Coarse Contractor Thread and Fine Standard Thread.
Fine Thread or Coarse Thread Fastener- Which is Better?
What is the difference between coarse thread and fine
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Coarse Contractor Thread & Fine Standard Thread
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SAE Set Screw Assortment Coarse & Fine Thread Sizes Female Hex Drive Black Oxide
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Thread Chart (UNF-UNC) Major and Minor Diameters
How to Choose the Material of Sandblasting Nozzles
Coarse Thread vs Fine Thread, Which One To Choose?
Basic Thread Concepts