I just got a pack of 8 on amazon for a fiver.I bought this some time ago:
Dunno if that's what you mean but they're cheap enough to get a variety of fittings. The threaded part was too small to measure. I think I got lucky on my first attempt.
I got the 2.5 ones coming. So I will look for a pack of#4-48 now.Do check the thread before buying. There are only two common ones used, a metric version and an imperial verson. I think they are M2.5 or #4-48.
