Gday Brian
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1/2 BSW and 1/2 UNC are the only size under 1 inch that match
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No they dont
( i suspect you missed a "dont" )
BSW is 12tpi, UNC is 13
That said, for all these sizes, the thread angle is always different,
and that can cause grief when mixed.
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There has been volumes printed on this subject
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Thats the good thing about standards.
If you dont like the one you have, you can just choose another
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Made in the USA like this photo it will be SAE
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Dunno.
More like "Assembled in the USA from local and imported ingredients"
SAE ( being closer to UNF ) means most US manufacturers wont use it.
They use UNC. I know this is true of all my Meades, my Lunt and my Feathertouch, as they all use UNC.
My homemade wedge adjusters use 1/2"UNEF,
but i havent seen that supplied in the US yet.
Andrew
PS My local bunnings do supply true "High Tensile" SAE bolts,
but only in the dedicated "Auto" section of the store, not the general fasteners area.