Fine Mist Pump Sizes Explained: 18-410, 20-410 & 24-410 Neck Finishes
Short answer: a fine mist pump size is written as neck diameter + thread style — an 18-410 pump fits an 18 mm bottle opening with a 410 thread (1.5 turns). Match the pump neck finish to the bottle neck finish and they seal perfectly; anything else leaks or won’t screw on. Below is the full size chart OEM buyers use.
What the Numbers on a Spray Pump Mean
Every sprayer is stamped with a code like 18-410 or 20-410. The first number is the neck opening in millimeters. The second (400/410/415/425) is the thread style — how many turns the cap makes to close. Two pumps with the same first number but different second numbers are not interchangeable.
Fine Mist Pump Size Chart (Most Common Finishes)
| Neck Finish | Typical Bottle Volume | Common Applications |
|---|---|---|
| 18-410 | 5 ml – 50 ml | Perfume samplers, essential oils, eye-grade toners, travel mists |
| 20-410 | 30 ml – 100 ml | Facial mists, hair-care sprays, the most popular skincare size |
| 24-410 | 100 ml – 300 ml | Body mists, sunscreens, larger cosmetic sprays |
| 28-410 | 250 ml – 500 ml | Household cleaners, plant mists, industrial trigger-style refills |
How to Match a Pump to Your Bottle
- Same neck finish = guaranteed fit. Ask your bottle supplier for the bottle’s neck finish code before ordering pumps.
- Check dip-tube length. The tube must reach the bottle bottom minus 2–3 mm; too long kinks, too short sprays air.
- Match output to formula. Fine mist pumps deliver roughly 0.12–0.25 ml per stroke; thicker oils need a larger orifice or a treatment pump.
- Test with your real formula. Viscosity changes spray quality — always run a fill test before mass production.
OEM Notes for Wholesale Buyers
At our factory we mold bottles and pumps in-house, so the neck finish is guaranteed to match — no cross-supplier fitting problems. Custom pump colors, overcaps and printed logos are available from 3,000 pcs, and every batch is leak-tested before packing. We ship plastic spray bottles from 5 ml to 500 ml with 18-410, 20-410 and 24-410 pumps pre-assembled; see also our amber spray bottles for light-sensitive formulas. Request a quote on the contact page — samples ship in 7 days. For the sizes wholesale buyers order most, see the 60 ml and 100 ml custom sprayer pump bottle guide.
What does 18-410 mean on a spray pump?
18 is the neck opening diameter in millimeters and 410 is the thread style (about 1.5 turns to close). An 18-410 pump only fits bottles with an 18-410 neck finish.
Which pump size fits a 100 ml spray bottle?
Most 100 ml bottles use a 20-410 neck finish, which is the most popular size for facial mists and skincare sprays. Always confirm the bottle’s neck finish code with the supplier.
Are spray pumps interchangeable between bottles?
Only when the neck finish code matches exactly. Two pumps of the same diameter but different thread styles (for example 18-410 vs 18-415) will not seal properly.
Can I order custom pump colors for my brand?
Yes. As an OEM factory we can mold pump collars and overcaps in any Pantone color, and print or hot-stamp your logo on the bottle, from around 3,000 pcs per SKU.
Do you supply bottles with pumps already assembled?
Yes. Bottles and pumps are molded in the same factory, assembled on the line and leak-tested before export packing, so buyers receive ready-to-fill units.
What is the lead time for wholesale spray pumps and bottles?
Stock sizes ship in about 7 days for samples and 15-25 days for bulk orders depending on quantity. Custom colors and private-label printing add 5-7 days for tooling and approval samples.