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Nut size (A.K.A. diameter) is the size bolt that the nut is used with. The same is true of the thread count. Thus a 1/4"-20 nut fits a 1/4"-20 bolt.
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This item is a semi-standard size and is therefore more expensive.
This item has limited availability. Call us to check stock.
A nut with a built in washer which is serrated to resist loosening.
For adding a machine thread to material that otherwise can not be tapped.
Flange bolts have a flange on the bottom of the head that distributes the load like a washer.