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Reducer coupling nuts accept two different threads. For example, one side (thread 1) may accept a 1/2"-13 threaded rod or other male fastener, and the other side accepts a 3/8"-16 thread (thread 2).
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$12.80 / 50
$120.00 / 500
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USS pattern is the most common type of flat washer.
SAE pattern is a tighter fit on the bolt and a smaller outside diameter.