16 lines
1.2 KiB
Markdown
16 lines
1.2 KiB
Markdown
---
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title: "Coupling nut"
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chunk: 1/1
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source: "https://en.wikipedia.org/wiki/Coupling_nut"
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category: "reference"
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tags: "science, encyclopedia"
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date_saved: "2026-05-05T11:46:48.309824+00:00"
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instance: "kb-cron"
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---
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A coupling nut, also known as extension nut, is a threaded fastener for joining two male threads, most commonly a threaded rod, but also pipes. The outside of the fastener is usually hexagonal so a wrench can hold it. Variations include reducing coupling nuts, for joining two different size threads; sight hole coupling nuts, which have a sight hole for observing the amount of engagement; and coupling nuts with left-handed threads.
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Coupling nuts can be used to tighten a rod assembly inward or to press a rod assembly outward.
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Along with bolts or studs, coupling nuts are also often used to make homemade bearing and seal pullers/presses. The advantage of a connecting nut over a standard nut in this application is that, due to its length, a greater number of threads are engaged with the bolt. This helps to spread the force over a larger number of threads, which reduces the possibility of stripping or galling the threads under a heavy load.
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== References == |