Technical Reference
Spray Bottle Nozzle & Neck Finish Specifications
Complete size chart for spray bottle neck finishes, thread dimensions, nozzle types, and closure compatibility. A technical reference for buyers, product designers, and packaging engineers.
Neck Finish Size Chart — Diameter & Thread Specifications
The neck finish determines which caps, pumps, and sprayers fit your bottle. The naming convention uses two numbers: the diameter (mm) and the thread style (GPI/SPI standard).
| Neck Finish | Diameter (mm) | Thread Type | Typical Bottle Size | Common Use | Compatible Closures |
|---|---|---|---|---|---|
| 18/410 | 18mm | Continuous | 10-50ml | Essential oils, samples, travel | Dropper, fine mist spray, screw cap |
| 20/410 | 20mm | Continuous | 30-120ml | Cosmetic sprays, perfume, facial mist | Fine mist spray, crimp pump, flip-top |
| 24/410 | 24mm | Continuous | 100-500ml | Hair spray, body mist, continuous spray | Continuous spray, lotion pump, disc-top, spray pump |
| 24/415 | 24mm | Continuous (fine) | 100-300ml | Premium cosmetics | Airless pump, treatment pump |
| 28/400 | 28mm | Buttress | 250-1000ml | Cleaning products, industrial | Trigger sprayer, foam trigger, pour cap |
| 28/410 | 28mm | Continuous | 200-750ml | General purpose, kitchen, garden | Trigger sprayer, pump, disc-top, continuous spray |
| 33/400 | 33mm | Buttress | 500-2000ml | Large cleaning, janitorial | Heavy-duty trigger, pour spout |
| 38/400 | 38mm | Buttress | 500-4000ml | Industrial, agricultural | Pump dispenser, pour cap, child-resistant |
Important: 28/400 and 28/410 are not interchangeable despite having the same diameter. The 400-series buttress thread and 410-series continuous thread have different pitches. Using the wrong combination results in poor sealing and potential leaks.
Nozzle Types & Spray Output Specifications
The nozzle type determines the spray pattern, droplet size, and output rate. Matching nozzle to application is critical for product performance.
| Nozzle Type | Orifice Size | Droplet Size | Output / Stroke | Spray Pattern | Best Application |
|---|---|---|---|---|---|
| Continuous Mist | 0.3-0.5mm | 40-70 μm | 0.8-1.2 ml/sec | Wide cone, sustained | Hair styling, body mist, cooking oil |
| Fine Mist | 0.2-0.4mm | 40-80 μm | 0.10-0.15 ml | Narrow cone, single burst | Facial toner, perfume, cosmetics |
| Standard Trigger | 0.5-1.0mm | 100-200 μm | 0.7-1.6 ml | Adjustable (mist ↔ stream) | Cleaning, garden, industrial |
| Foam Trigger | Mesh screen | N/A (foam) | 0.5-1.0 ml | Foam cone | Glass cleaner, bathroom cleaner |
| Stream Nozzle | 1.0-2.0mm | 500+ μm | 2.0-4.0 ml | Direct stream | Spot cleaning, pest control |
| Adjustable Nozzle | 0.3-1.5mm | 50-300 μm | 0.5-2.0 ml | Rotary (mist → stream) | Multi-purpose, garden |
Closure Compatibility Matrix — What Fits What
This matrix shows which closure types are available for each neck finish size. Use this to plan product lines where you want one bottle body with multiple closure options.
| Closure Type | 18/410 | 20/410 | 24/410 | 28/400 | 28/410 | 33/400 |
|---|---|---|---|---|---|---|
| Continuous Spray Pump | — | — | ✓ | — | ✓ | — |
| Fine Mist Spray | ✓ | ✓ | ✓ | — | ✓ | — |
| Trigger Sprayer | — | — | — | ✓ | ✓ | ✓ |
| Foam Trigger | — | — | — | ✓ | ✓ | ✓ |
| Lotion Pump | — | ✓ | ✓ | — | ✓ | — |
| Disc-Top Cap | — | ✓ | ✓ | — | ✓ | — |
| Flip-Top Cap | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Screw Cap | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Dropper | ✓ | ✓ | — | — | — | — |
| Child-Resistant Cap | — | — | ✓ | ✓ | ✓ | ✓ |
Note: Compatibility is based on standard GPI/SPI specifications. Custom neck finishes may vary. Always confirm compatibility with your supplier using physical samples before production orders.
Frequently Asked Questions
What does 24/410 neck finish mean?
The first number (24) is the diameter in millimeters of the bottle opening. The second number (410) refers to the thread style — specifically the GPI/SPI thread finish standard. "410" means a continuous thread with a specific thread pitch. So a 24/410 neck finish has a 24mm diameter opening with a 410-style continuous thread. This is one of the most common sizes for cosmetic and personal care spray bottles.
What is the most common spray bottle neck finish?
The 28/410 is the most widely used neck finish for spray bottles globally. It fits most standard trigger sprayers and pump sprayers. For smaller cosmetic bottles (30-100ml), 20/410 and 24/410 are standard. For large industrial bottles (750ml-1L), 28/400 is common. About 80% of spray bottles on the market use one of these four sizes.
Can I put a trigger sprayer on a continuous spray bottle?
Only if they share the same neck finish. Most continuous spray bottles use 24/410 or 28/410 neck finishes — the same as many trigger sprayers. If the thread size matches, the closures are physically interchangeable. However, the bottle body shape may be optimized for one mechanism type, so the ergonomics may not be ideal.
What is the difference between 28/400 and 28/410?
Both have a 28mm diameter opening, but the thread pitch is slightly different. 28/400 has a buttress thread (wider, more aggressive pitch) designed for closures that need quick, secure attachment — common on industrial and cleaning bottles. 28/410 has a continuous fine thread, standard on personal care and cosmetic bottles. They are NOT interchangeable — a 28/400 cap will not seal properly on a 28/410 bottle.
How do I measure a bottle neck finish?
Measure two things: (1) the outer diameter of the thread in millimeters (use calipers for accuracy), and (2) count the number of thread turns from top to bottom. The diameter gives the first number (18, 20, 24, 28, etc.) and the thread style gives the second (400, 410, etc.). For most commercial purposes, measuring the diameter and checking the cap compatibility against GPI/SPI standards is sufficient.
What nozzle orifice size produces the finest mist?
Nozzle orifice sizes of 0.2-0.4mm produce the finest mist (40-80 micron droplets), used in cosmetic fine mist and continuous spray bottles. Standard trigger sprayers use 0.5-1.0mm orifices, producing larger 100-200+ micron droplets. Smaller orifices produce finer mist but require higher pump pressure and are more prone to clogging. The relationship is: smaller orifice → finer mist → higher pressure required → higher manufacturing cost.
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