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Product Description
Acoupling nut, also known asextension nut, is athreadedfastenerfor joining two male threads, most commonly athreaded rod,]but also pipes.The outside of the fastener is usually a hex so a wrench can hold it. Variations includereducing coupling nuts, for joining two different size threads;sight hole coupling nuts, which have a sight hole for observing the amount ofengagement; and coupling nuts with left-handed threads.