I doubt it for several reasons : Small UNC screws are very uncommon in Europe, other than in imprted American stuff (and getting replacement screws for such things in the UK is an entertainment, I ended up buying a laod from Digikey...). This telephone uses the same thread not just for the barier strip terminals, but also for just about every other screw in the unit (to hold the switches ot the chassis, the chassis to the cover, the various parts of the case together, etc). I think it's very unlikely that that French would use an obscure UNC thread (and the odd numbered ones are much less common than the even numbered ones). I measured the overall diamaeter of the screw with a good micrometer. Alas it's an imperial micrometer, not a metric one, but on conversion, I got a diamaeter of a smidgen under 3mm (I think the conversion was 2.97mm, but it's not as accurate as that). No way is it 3.1mm (or 3.2mm, suggesting 5BA). As for the pitch, I used those pitch guages which conssit of little strips of metal with accurately cut teeth in one edge. Alas my metric set doesn't include 0.6mm ( which is odd, since it's common for M3.5 screws), hut the imperial one that fits is 42tpi. 42tpi is about 0.605mm pitch. I could beleive 0.6mm (it's not that accurate after all). The 40tpi imperial gauge doesn't fit at all. Given that this telephone is French and somewhat old, I suspect an old French thread standard is a very likely candidate... Over here, the common barrier strip screws (and there are others) are 6-32 UNC, M3.5 and 4BA. -tony