Thanks for making these, it should help many folks understand what you get for 5-20x the price of a clone versus a true Hakko. The fake tips typically go for $1-2 each whereas real Hakko tips now sell between $5-20 each, the more obscure the shape, the more costly it is.
The real problem is paying the true Hakko price for a counterfeit tip, so be careful where you buy them. If you knowingly buy a copy tip for $1-2 its not so much a loss if it lasts for a few projects or you rarely use that particular shape, however beware that fake tips could damage a true Hakko ceramic heater, which is $20 expense; original tips last a long time, at least with old Pb-Sn solder.
If you check the archives, you'll find an old post of mine with links to the patents for the unique alloy Hakko uses in its tips. This provides the temperature conductivity and longevity expected of the tip; its often why copies of the 936 mention it can use genuine tips and heaters.
One can't tell much about the alloy looking at the photos but 3 things are important:
The fit to the heater must be perfect to provide maximum conductivity without causing the tip to tighten around the ceramic so much it cannot be removed; also if the tolerance is too small or the alloy causes too much expansion, the tip could expand, crack and permanently damage the heater ceramic.
The middle tip has an asymmetrical hole. This is not acceptable; it will cause uneven heating, heating the thin area around 4 o-clock in the photo faster than the rest of the tip. It will also wear away faster on the thinner side, which in a problem since the base of the tip doesn't really get used in soldering; its there to only conduct heat.
Finally, there appears to be a small gap or crack in the middle tip, at about 4 o-clock. If so, this section may likely prematurely wear from oxidation and eat into the copper layer. If solder were to penetrate here, it would wear even faster.
