Jeez, I was hoping for a start wars spoiler about a new kind of death ray.
I can measure a spoke when I get home on Monday, if still needed. I presume they are a metric thread, there's no good reason for Honda to use inch sizing on spoke threads.
Just in case there's a difference... what bike model?
Note stock nipples may not work on alloy wheels - there is a variety of spoke hole sizes available on alloy wheels. Stock steel rims will match the originals. If you bought alloy rims on ebay or similar you may need special nipples (if the hole angles are even correct).
I made that mistake, and now have a pair of really nice 18" 36 hole shouldered alloy wheels that I can't use. Buchanans sold me a equally nice pair and spoke sets - exactly correct for the front at least. Now I just have to get around to installing the rear one.