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What size bolt mates with 1/4" NPT female quick-release couplers such as those used with air compressors?

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Here's typical 1/4" NPT female quick-release coupler: http://www.aircompressors.us.com/store/i/is.aspx?path=/Shared/images/Powermate/038-0010CT.jpg

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  1. The other post covered it real well. For nonsense information some pipe threads match some metric thread pitches in the smaller sizes.


  2. NPT stands for National Pipe Thread.  It is a tapered thread for pipes.

    Bolts use a straight thread that is not compatible with the NPT.

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