A neck finish like "24/410" is not a single measurement — it is a standard. The first number is the thread diameter in millimeters, the second is the turns-per-inch (TPI) / style code that defines the thread profile. A 24/410 pump will not seal on a 28/410 bottle even though both are common.
| Code | Neck OD (mm) | Common use |
|---|---|---|
| 20/410 | 20 | Travel sizes, mist sprayers |
| 24/410 | 24 | Shampoo / lotion, disc-top & pumps |
| 28/410 | 28 | Larger lotions, wide pumps |
| 32/415 | 32 | Trigger & wide-mouth jars |
It balances a secure seal with a comfortable dispensing orifice and fits the widest range of stock closures — pumps, disc-tops, flip caps and sprayers. Most of our 300–1000ml bottles use 24/410.
