Neck Finish 24/410 vs 28/410: Dimensions and Closure Compatibility

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.

The Two Numbers, Decoded

Why 24/410 Is the Shampoo Default

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.

Matching Closures Without Surprises

• Always spec closure and bottle neck together.
• Request a physical fit sample before full production.
• Confirm liner material (PE vs induction foil) for your formula.