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Mortise, Tenon, and Beyond: The Joinery Quiz
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What is a defining characteristic of National Pipe Taper (NPT) threads that differentiates them from standard machine threads?
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50-50
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A
They feature a left-handed thread orientation to prevent accidental loosening
B
The threads are cut on a taper, causing them to wedge together and create a seal as they are tightened
C
They have a completely flat crest and root to maximize surface area contact
D
They require no thread sealant or tape to remain watertight
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