Soldering Iron Tips: Shapes and Care

The tip is the part of the iron that actually touches your work, and it has a large effect on results. The right shape makes joints easier, while a neglected tip makes even a good iron frustrating. Here is how common tip shapes differ and how to look after them.

Common tip shapes

Names vary between manufacturers, so check the product description, but most tips fall into a few families.

Conical (pointed)

A round, tapered point suited to small, precise joints, such as fine-pitch components and tight spaces. The small contact area limits heat transfer, so it is less suited to large pads or thick wires.

Chisel (flat)

A flat, wedge-shaped end with a wider contact face. It transfers heat well and is a popular general-purpose choice for through-hole parts, wires and terminals. Many experienced users prefer a small chisel over a needle point for everyday work.

Bevel

A slanted cut face that holds a bead of solder on the angled surface. It is useful for dragging solder across multiple pins and for general work where you want a controlled amount of solder at the tip.

Knife and blade

Thin, flat edges suited to drag soldering and to working along rows of pins on surface-mount parts. They give a long contact line without a large tip mass.

Hoof and large chisel

Wider tips hold more heat and solder and suit big joints, heavy wires and shielding cans.

A sensible beginner approach is to start with a small to medium chisel or conical tip, then add other shapes as specific jobs call for them. You can find replacement tips in the soldering equipment category, but always confirm a tip is compatible with your exact iron or station model, because fittings are not universal.

Match size to the joint

A good rule is to use the largest tip that fits comfortably on the joint without touching nearby parts. Greater contact area and thermal mass let you work faster with lower temperature settings. Tiny tips on big joints force you to hold the iron down longer, which risks damaging the board.

Tinning: your tip's protective coat

Most tips have an iron plating over a copper core, finished with a chrome layer to keep solder only on the working end. Solder wets the exposed plated area. Tinning means coating that working area with a thin layer of fresh solder. A tinned tip conducts heat well and resists oxidation. Tin a new tip the first time you heat it, following the manufacturer's instructions, and add a little fresh solder whenever you put the iron down for a moment.

Cleaning the tip

• Brass wool: Gently wipe the hot tip through it. It cleans without a big temperature drop and is kind to the plating.
• Damp sponge: Works, but the cold water can shock the tip and shorten its life if overused.
• Tip tinner/cleaner: A small pot of paste used occasionally to revive a dull, oxidised tip.

Clean before making each joint or every few joints, then re-tin lightly. Avoid scraping the tip with files or sandpaper, since this strips the plating and exposes the copper, which will quickly erode.

How to make tips last longer

• Do not run the iron hotter than you need. High temperature speeds oxidation and wear.
• Turn the iron off, or use a sleep function, when you take a break.
• Always store the iron hot-tip-tinned. Apply a generous coat of solder before turning it off.
• Do not use the tip as a lever, scraper or pry tool.
• Use flux-cored solder suitable for electronics and avoid aggressive, acidic fluxes.
• Do not leave it idling for long periods at high temperature.

Signs a tip needs replacing

If solder will no longer stick even after cleaning and re-tinning, or the plating is visibly pitted, worn through or eroded to the copper, it is time for a new tip. A tip can also seize in the iron barrel if it is never removed, so loosen and remove it occasionally, with the iron cool, to keep it free.

Safety notes

Tips run hot enough to burn skin and ignite materials, so only change or adjust them when the iron is fully cool, or with proper heat-proof tools. Work with ventilation, because heated flux produces fumes that irritate the eyes and lungs. Leaded solder is toxic, so wash your hands afterward.

If you are still deciding which iron to use these tips with, read our guide to choosing a soldering iron. With the right shape and a clean, well-tinned tip, soldering gets noticeably easier.