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The dimensions of a 1/4-20 hex nut are as follows The width across the flats (the distance from one flat side of the hex nut to the opposite flat side) is typically around 7/16 of an inch. The height of the nut (the distance from the bottom of the nut to the top) is usually around 1/4 of an inch. The thread pitch of a 1/4-20 hex nut is 20 threads per inch, which means that it will take 20 complete turns to advance the nut one inch along a threaded bolt.

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threaded rod 12mm price