The recommended tip size for micro-soldering is one that matches the width of the micro-component (A), or A-0.1mm. Tips that are slightly larger than "A" can be used if it does not come into contact with the adjacent components.
The long life soldering tip is derived from basic types B, BC, C, D and K by special processing. Hakko's special treatment allows a tip to last approximately two times longer than the standard type. It's the optimum approach for the short life tip by corrosion hole.
This tip has a concave section (or V-groove) at the tip to allow better access to the lead. The wider surface area that comes into contact with the board and the lead means that there is an excellent heat supply to the solder joints, ensuring sufficient solder flow-up.
Shape S is derived from other shapes (B, C, D, I) and adapted to be suitable for narrow-pitch soldering while still maintaining the shape. Shape S has a narrower neck to avoid nearby components on a packed circuit board.