Notch coil: jagged wire explained as a vaporiser coil

The term ‘notch coil’ derives from the English word ‘notch’. Instead of a spirally wound wire, this design uses a thin-walled metal tube – usually made of stainless steel (SS316L) or Kanthal – into which precise slits are cut using a laser or a milling machine. These notches force the electric current to follow a zigzag path through the material. This creates the jagged wire that gives the coil its name, even though it is actually a single, structured tube.

Unlike a classic round coil or complex builds such as Clapton and Alien coils, the Notch Coil has no individual, overlapping windings. This makes it visually cleaner and mechanically more stable. The cotton is pulled directly through the tube, similar to other rebuildable atomiser setups. Legally, it is classified as a vaping accessory for adults aged 18 and over.

The Notch Coil design utilises a physical principle: by forcing the current to take a longer path along the notches, the tube behaves like a classic coil with many windings – only more compact in size. Depending on the design, the typical resistance lies between 0.2 and 0.5 ohms, clearly within the sub-ohm range.

Advantages in everyday vaping

• Even heat distribution: The entire inner surface heats up almost simultaneously; hotspots are rare.
• Fast response: Due to its low mass, the Notch Coil heats up quickly.
• Flavour neutrality: Well-burned-in Notch Coils impart little inherent flavour.

Typical applications

Notch coils are mostly used in RDAs (Rebuildable Dripping Atomisers), and occasionally in RTAs. They are suitable for aromatic short-fill e-liquids with a high VG content and are ideal for direct-to-lung vaping at 30 to 60 watts. They are less commonly used for MTL setups or classic pod systems.

The selection of pre-built Notch Coils is smaller than for classic coils, so it’s worth taking a close look at the specifications:

• Check the material: Stainless steel (SS316L) allows for temperature control, whilst Kanthal is only suitable for power mode. The material must be compatible with your mod.
• Note the inner diameter: 2.5 to 3.0 mm is standard. Thicker cotton requires a larger diameter, otherwise it will burn.
• Resistance value: Check the specified ohm value and ensure it matches your mod’s limits. Below 0.2 ohms, you should only use a tested, rebuildable-coil-protected device.
• Build quality: Clean, burr-free notches are essential. Irregular cuts lead to uneven heating and a burnt taste.
• Cotton choice: Long-fibre cotton without bleach works best. The cotton should fill the tube loosely but completely.

Common mistakes: Too much cotton blocks the draw and causes dry hits; too little cotton allows e-liquid to seep through and makes the atomiser leak. Also important: Before first use, briefly dry-fire Notch Coils until they glow evenly, and only then saturate them with e-liquid. If you haven’t practised building your own coils before, it’s better to start with a pre-made model before attempting to build your own.

Is a Notch Coil better than a Clapton Coil?

It’s impossible to say definitively whether one is better or worse. Notch coils score points for simplicity and a clean taste, whilst Clapton or Alien builds produce more vapour and more intense flavours. For beginners to DIY coil building, the Notch coil is often easier to handle.

Can I make a Notch Coil myself?

In practice, no. The precise notches require a laser or CNC milling machine. You can only buy Notch Coils ready-made; you cannot wind them at home like a round coil. However, you do insert them into the atomiser and pack the cotton yourself.

How long does a notch coil last?

With normal use and regular dry-burning, a Notch Coil lasts around two to four weeks. Sweet e-liquids with a high sugar content significantly shorten its lifespan, as residues build up in the notches.

Which atomisers is the Notch Coil suitable for?

Mainly for rebuildable atomisers (RDAs, occasionally RTAs) with two contact points and sufficient space. Notch Coils are not usually compatible with pre-built sub-ohm tanks or pod systems.

Notch Coils are an interesting alternative to classic coils: simple construction, clean appearance, balanced flavour. Used correctly, the notched wire delivers a consistent vaping experience without the hassle of winding. If you’re looking for a suitable replacement or want to compare different designs, you’ll find a range of coils and atomiser heads in various materials and resistance values. Always check compatibility with your atomiser before purchasing and, if in doubt, start with a slightly higher ohm rating.