What Is a 510 Cartridge?
A 510 cartridge is a small tank of cannabis oil with a heating element inside and a screw thread on the bottom. The "510" is the thread standard: 5mm long, 10 threads. Because nearly every battery and cart on the market uses the same thread, you can screw a cart from one brand onto a battery from another and it works. That interchangeability is why 510 carts became the default format for vaping oil in every licensed US market.
What the 510 number actually means
510 refers to the thread on the bottom of the cartridge: roughly 5mm of thread with 10 turns, the same M7x0.5 metric thread you'll find on the top of a 510 battery. It started as an e-cigarette standard around 2010, long before cannabis used it, and stuck because it was cheap to machine and already everywhere.
There are two things the number does not tell you. It says nothing about the cart's capacity, and nothing about what's inside. A 0.5ml glass cart and a 1ml plastic cart both have a 510 thread. The thread only guarantees the cart will fit the battery, not that it will work well on it.
The parts of a 510 cart
A cart has five parts, top to bottom:
1. Mouthpiece. Ceramic, metal or plastic. Screws or presses onto the top of the tank. Round or flat "duckbill" shapes.
2. Tank. Holds the oil. Glass on better carts, polycarbonate on cheaper ones. 0.5ml and 1ml are the standard sizes, with 2ml appearing in states that allow it.
3. Center post. The tube that runs down the middle carrying vapour from the coil to the mouthpiece.
4. Heating element. A ceramic core or a wick-and-coil at the bottom of the tank. The oil seeps into it through small intake holes and vaporises when the battery sends power.
5. 510 base. The threaded metal bottom. It carries the positive and negative contact to the battery.
The heating element matters more than any other part. Ceramic cores heat evenly and don't burn at normal voltages. Cotton wicks are cheaper and taste fine at first, but scorch if the battery runs hot or the oil runs low.
Cart sizes
- 0.3ml: trial or sample size. Rare in licensed markets.
- 0.5ml: the most common single. Roughly 150 puffs.
- 1ml: a full gram. Roughly 300 puffs and the best value per milligram.
- 2ml: allowed in some states. Longer, heavier, and needs a battery with the power to match.
Capacity is measured in millilitres, not grams, though the cannabis market says "half gram" and "full gram" because the oil is close to 1g per ml.
Glass, metal or ceramic: what the materials change
The tank and mouthpiece come in three materials and each changes how the cart feels and tastes.
- Glass tank, metal base. The standard. Clear so you can see the oil, doesn't absorb flavour, feels like a premium product. Most licensed brands use this.
- All-ceramic. Ceramic tank and mouthpiece. Opaque, cool to the touch, no metal in the airpath. Chosen for a cleaner taste and a heavier feel in the hand. Costs more.
- Metal tank. Stainless or brass. Nearly unbreakable, usually paired with a metal mouthpiece. Less common in cannabis because you can't see the fill level.
If you're buying carts for a brand rather than for yourself, the material decision is mostly about shelf perception and price per unit. We cover the trade-offs on the custom vape cartridges page.
Which batteries fit
Any 510 thread battery. The variables are voltage and airflow. Most carts with a ceramic core run best between 2.8V and 3.4V. Push a cotton-wick cart above 3.6V and you'll taste it burning. Variable-voltage pen batteries let you dial it in; a fixed-voltage battery is simpler but only works well with carts made for that voltage.
Some batteries have a preheat mode, which warms thick oil for a few seconds so the first draw isn't weak. Useful in cold weather or with high-viscosity distillate.
510 cart versus disposable vape
A disposable has the cart and battery built into one sealed unit. You throw the whole thing away when the oil is gone. A 510 cart is just the tank; the battery stays.
- Battery: separate and reusable on a cart; built in and thrown away on a disposable.
- Sizes: 0.5ml, 1ml and 2ml carts; 0.5ml to 3ml disposables.
- Price per unit: lower for carts, higher for disposables.
- Waste: a cart is just the tank; a disposable is the tank plus a battery and lithium cell.
- Fit: a cart works on any 510 battery; disposables aren't interchangeable.
Disposables have been gaining share because there's nothing to explain at the counter. Carts still win on price and waste, and on volume in mature markets.
What to check before you buy a cart
Three things, in order:
1. Lab results. Every licensed cart has a batch number and a certificate of analysis. Check that potency and contaminant results exist for that batch, not just for the brand.
2. The oil looks right. Distillate is clear amber. Live resin is darker and cloudier. Very dark, very thin oil is often a sign it's been cut or heat-damaged.
3. The cart isn't leaking. Oil above the intake holes is normal. Oil on the thread or in the base means the seal has failed.
If you're the one filling them
Brands buying 510 carts in bulk make a different set of decisions: material, core type, capacity, oil viscosity match, and whether to box each cart or sell in a blister. Minimums start at 5,000 and the cart, the packaging and the child-resistant closure should be specified together, because the box has to fit the cart and pass the same compliance check. That's what we do at First Run Supply. Send the oil spec and target price and we'll quote hardware and packaging as one line.
Quick answers
What does 510 mean on a vape cart? The thread standard on the base: 5mm of thread, 10 turns. It fits any 510 battery.
Are all 510 carts the same size? No. The thread is the same; the tank comes in 0.3ml, 0.5ml, 1ml and 2ml.
Do 510 carts fit every pen? Every 510 thread pen, yes. Pod systems and proprietary carts don't use the thread.
What voltage should I use for a 510 cart? 2.8V to 3.4V for ceramic-core carts. Lower for thin oil, higher for thick.
Is a 510 cart better than a disposable? Cheaper per unit and less waste. Disposables are simpler for the customer and come in bigger sizes.
