What Does 18/415 Mean on a Perfume Pump? A Guide to Neck Size
If you are sourcing a screw perfume pump, you may have seen specifications such as 13/415, 15/410, or 18/415.
But what does 18/415 actually mean?
In simple terms, 18 refers to the nominal thread diameter, while 415 identifies the neck finish or thread style. Both specifications are important when matching a perfume pump with a bottle.
This guide explains what 18/415 means, how it differs from 18/410, and what buyers should check before ordering.
What Does 18/415 Mean?
The specification 18/415 consists of two parts:
- 18 – nominal thread diameter, approximately 18 mm
- 415 – neck finish or thread style
The “18” does not mean that the bottle opening is exactly 18 mm. It refers to the nominal diameter of the threaded neck.
The “415” is a finish designation that describes the thread configuration.
Therefore, an 18/415 perfume pump is designed for a compatible 18/415 bottle neck, rather than simply any bottle with an 18 mm diameter.
What Is a Bottle Neck Finish?
A bottle neck finish is the threaded section at the top of a bottle where a closure or pump is attached.
It determines how the pump:
- Engages with the bottle thread
- Sits on the bottle
- Seals the package
- Maintains a stable connection
For screw perfume pumps, the neck finish is especially important because the pump and bottle must work as one system.
The diameter alone is not enough to confirm compatibility.
What Does the “18” Mean?
The 18 represents the nominal diameter of the threaded bottle neck.
It is commonly associated with the outside diameter across the bottle threads.
However, it does not mean:
- The bottle opening is 18 mm
- The inside diameter is 18 mm
- Every 18 mm neck has the same thread
Other dimensions and the finish specification also affect compatibility.
For this reason, when contacting a supplier, it is better to specify 18/415 rather than simply asking for an “18 mm perfume pump.”
What Does the “415” Mean?
The 415 is the neck finish designation.
Different finish codes represent different thread configurations. Common examples include 400, 410, and 415.
Although these finishes may have the same nominal diameter, their thread geometry and finish dimensions can be different.
For packaging buyers, the key point is simple:
The first number identifies the nominal diameter; the second number identifies the finish.
Both need to match the bottle and pump specifications.
18/415 vs. 18/410: What's the Difference?
18/415 and 18/410 are not the same neck finish.
Both have an 18 mm nominal diameter, but the finish specification is different.
This means an 18/415 perfume pump should not be assumed to fit an 18/410 bottle simply because both start with “18.”
Always confirm the bottle's complete neck finish before ordering.
| Specification | 18/410 | 18/415 |
|---|---|---|
| Nominal diameter | 18 mm | 18 mm |
| Finish | 410 | 415 |
| Thread configuration | Different | Different |
| Interchangeable | Not automatically | Not automatically |
Why Is Neck Size Important for Perfume Pumps?
The neck finish directly affects the connection between the perfume bottle and pump.
A mismatch may cause:
- Poor thread engagement
- An unstable pump
- Incorrect seating
- Visible gaps
- Potential sealing problems
For fragrance packaging, buyers should therefore confirm the neck finish before finalizing the pump.
The bottle and pump should ideally be tested together before mass production.
How Can You Check Your Bottle Neck Size?
There are three practical ways to confirm the neck finish.
1. Check the bottle specification
Look for information such as:
Neck Finish: 18/415
This is the simplest method.
2. Check the technical drawing
A bottle drawing provides more detailed information about the neck dimensions and thread configuration.
For custom packaging projects, this is the preferred reference.
3. Send a bottle sample
If you are unsure about the specification, sending a physical bottle sample to the pump supplier can help confirm compatibility before bulk production.
Avoid choosing a pump based on visual appearance or approximate measurements.
What Other Perfume Pump Neck Sizes Are Available?
18/415 is one of several neck finishes used for perfume and cosmetic packaging.
Common specifications include:
- 13/415
- 15/410
- 18/410
- 18/415
The appropriate size depends on the bottle design and closure requirements.
For example, UnionSprayer offers screw perfume pump options in different neck sizes and configurations for fragrance packaging applications.
How Should You Specify an 18/415 Perfume Pump?
When requesting a quotation, avoid saying only:
“I need an 18 mm perfume pump.”
A more useful specification is:
Neck Finish: 18/415
Spray Output: 0.06 ml / 0.07 ml
Collar: Aluminum or plastic
Color: Standard or custom
If available, also provide the bottle drawing or sample.
This gives the supplier enough information to check compatibility and recommend the appropriate pump.
18/415 Perfume Pump from UnionSprayer
UnionSprayer supplies screw perfume pumps and fine mist sprayers for fragrance and cosmetic packaging.
Our 18/415 options are available in different finishes and configurations, with OEM customization available for color and packaging requirements.
For a new fragrance project, we recommend confirming the bottle neck finish first and testing the pump with the actual bottle before bulk production.
If you are unsure whether your bottle is compatible with an 18/415 perfume pump, send us the bottle specification, drawing, or sample details for evaluation.
FAQ
Is 18/415 the same as 18/410?
No. Both have an 18 mm nominal diameter, but 410 and 415 are different neck finishes.
Does 18/415 mean the bottle opening is 18 mm?
No. The 18 refers to the nominal diameter of the threaded neck, not the internal bottle opening.
Can an 18/415 pump fit any 18 mm bottle?
No. The finish must also be compatible. An 18 mm diameter alone is not sufficient.
What is the best way to confirm an 18/415 pump?
Check the bottle specification or technical drawing. For production orders, a physical compatibility test is recommended.
Is 18/415 suitable for perfume bottles?
Yes. 18/415 is used for screw-type dispensing components and perfume packaging, but compatibility should be confirmed with the specific bottle.
Conclusion
18/415 is more than just an 18 mm size.
The 18 indicates the nominal thread diameter, while 415 identifies the neck finish.
When sourcing a screw perfume pump, always confirm the complete neck finish, not just the diameter. For 18/415 perfume pumps, matching the pump with the correct bottle neck can help ensure proper assembly and reliable packaging performance.
Need an 18/415 perfume pump for your fragrance project? Contact UnionSprayer with your bottle specifications or sample requirements.