2UUL FD31 K Soldering Iron Tip for C115 Soldering Station (1 Pack)

Every microsoldering technician knows a worn or mismatched tip slows down the whole repair bench. The 2UUL FD31 K solves that problem directly — it's a Knife (K-type) tip built specifically for the C115 soldering tip series, designed to slot into the JBC NT115 handle and work smoothly across the wider family of C115-compatible stations. If your workshop runs GVM, OSS, Aifen, Wemon, Sugon, or Aixun soldering stations that accept the C115 cartridge, this tip drops right in without extra adapters or modification.What sets the C115 series apart from older soldering tip designs is the integrated heating core. Instead of a separate heater element and tip, the FD31 K combines both into a single unit, which cuts down heat-up time dramatically. You get working temperature in seconds rather than the slow ramp-up you'd expect from a traditional iron. On a busy repair bench where you're switching between multiple boards, that speed adds up over a full day of work.The knife-shaped tip geometry is what makes this specific variant useful for a different set of jobs than the pointed (I-type) or curved (IS-type) tips in the same series. Drag soldering across a row of pins, cleaning old flux and solder residue off pads before rework, and general reflow work on slightly larger joints — this is where the K-type earns its place in your toolkit. If you're doing fine-pitch BGA work or reballing small ICs, you'd reach for the pointed tip instead, but for pad prep, jumper lagana, and cleanup passes before precision work, the knife tip is the more efficient choice.Build quality matters more on a tip than almost any other tool on the bench, since it's the one part making direct contact with the board. The FD31 K uses an alloy and copper core wrapped in a stainless steel shell. Copper gives you the thermal conductivity needed for fast, even heat transfer to the joint, while the stainless shell protects the tip from oxidation and physical wear over repeated use. That combination is what keeps a tip performing consistently instead of degrading in performance within weeks.For technicians dealing with dead phone boards, charging issue diagnostics, or board-level jumper work, having a dependable knife tip on hand means less time fighting the tool and more time solving the actual hardware fault. A tip that heats up fast and holds its shape reduces the risk of cold joints or excess heat damaging nearby components — something that matters when you're working close to sensitive ICs on a crowded PCB.Since this is a wear part, keeping a spare or two in stock is standard practice for any shop that runs a C115-based station daily. Swapping in a fresh FD31 K takes seconds thanks to the cartridge design, so there's no reason to keep pushing a degraded tip through another repair job and risking a damaged board.Whether you're running a JBC-based bench or one of the compatible third-party stations, the 2UUL FD31 K gives you a dependable, purpose-built knife tip that keeps your soldering workflow moving without compatibility headaches.