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What is the difference between Quick-Access Doors with clearance holes and those with tapped holes?

April 26, 2017clearance difference doors tapped

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What is the difference between Quick-Access Doors with clearance holes and those with tapped holes?

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The main difference is in the practicality of mounting the door. Functionally, the performance is the same. If the port flange for the door is so close to the chamber than bolts cannot be inserted through the backside of the port flange, then it is necessary to fasten the door from the front. Usually, this would mean the port flange has tapped holes. If the port flange has clearance holes, bolts would be inserted from the back side of the flange and secure a door with tapped holes. If a door with clearance holes is to be mounted to a flange with clearance holes, consult factory for bolt length requirements.