What thread on my gooseneck?

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Hi. I've bought two gooseneck fittings that were probably made in China. The description gives the threads for each end as M8/M10. When I received the goosenecks, one of the smaller of the nuts (M8) was missing. So, I went and ordered an M8 half nut. But, it does not fit the smaller of the threads. So, I bought 5/16ths UNF, but that does not fit. So I bought 5/16ths UNC and that does not fit. A while ago I bought a pack of carriage bolts. Probably all metric types. Well, the M8 nut that I bought, does fit one of my carriage bolts. I'm actually assuming my carriage bolt is M8, but, whatever, it's diameter is 6.95mm. I'm now stuck, because no nut I've bought, (seperately from the nuts that came with the goosenecks -I bought 2 goosenecks, so nuts I actually got were 3XM10 & 1x M8) fits the gooseneck. The nut from one of the the gooseneck purchases does not fit the carriage bolt. The thread on gooseneck is finer than on the carriage bolt.
 
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Strictly I bought a flexible gooseneck:
 

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Some of the flexible connectors are threaded Metric Fine where they enter the tap base......maybe this one is the same.
John :)
 
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