Bottle Neck Finishes: 18/410, 20/410, 24/410 and 28/410 Explained
The neck finish decides which pump, cap or sprayer fits your bottle. It is also the number buyers most often leave out of a brief — and the reason a container of pumps arrives that nobody can use.
Every bottle we mould is defined by its neck before anything else. The neck is the only part of the container that has to interface with a component made somewhere else, to a tolerance measured in tenths of a millimetre.
Below is how the four finishes we hold in stock are used, and how to choose between them.
What the Two Numbers Mean
Take 24/410. The 24 is the nominal outside diameter of the neck in millimetres. The 410 is the thread standard: a single-start thread with a defined pitch and depth. Two bottles can both be “24 mm” and still take different closures if the thread differs — which is why the second number is the one to quote.
Why the Same Neck From Two Suppliers May Not Fit
Thread dimensions have a tolerance band, and moulds wear. A pump that clicks onto one 24/410 bottle may feel tight on another. This is normal and is why we test pumps on our own bottles rather than trusting the drawing alone.
If you are buying bottles and pumps from different suppliers, ask both for the neck drawing and compare the thread callout, not just the diameter.
Matching a Closure to a Product
Viscous products — lotions, creams, gels — need a pump with a dip tube that reaches the bottom corner. Thin products suit a disc-top or flip-top. Oils and serums usually take a dropper at 18/410. Mist sprayers at 20/410 and 24/410 are for fragrances and toners.
Questions We Get on This
Is 24/410 the same as 24/415?
No. Both are 24 mm necks, but the thread differs and closures are not interchangeable. Quote the full number, including the thread, on every purchase order.
Can you make a bottle with a neck you do not stock?
Yes, with a new neck insert. It is a modification to an existing mould rather than a new mould, typically USD 300–800 and 7–10 days.
How do I measure a neck without a drawing?
Measure the outside diameter across the threads with a caliper, then send a photo of the closure's thread. We identify the finish from those two.
Do you supply closures separately?
Yes — pumps, sprayers and caps at 1,000 pcs MOQ, whether or not you buy the bottle from us.
