Some time ago I was asked about drag soldering tips for FX-888D.
T18 serie doesn't offer such shape which is available instead for 900M and T15.
Last January I was in Japan and visited the HAKKO tip's manufacturing factory, that place is really cool.
Walking around with the production manager, I asked how many tips per year are manufactured. The 900 serie is still the main for quantity they do, T18 is far (far far) less.
There are no plan to develop a CM shape for T18 so my decision is to have stock for 900M-T-C2 and 900M-T-C3
They will arrive soon
I'm afraid some time ago few people asked for this shape and I was not aware I could offer the 900M for the FX-888D
I hope this message will help who is looking for such soluiton
HAKKO description:
This type differs from Shape BC by the addition of a hollow to its cut face, providing high solder retention capability.
It is used for drag soldering and correction of bridging.