Views: 89 Author: BEYAQI Publish Time: 2026-11-07 Origin: Site
When sourcing cosmetic bottles, pumps, sprayers, or screw caps, you may come across codes such as 20/410, 24/410, and 24/415. These numbers are not batch codes or product model numbers. They identify the bottle's neck finish—the dimensions and thread configuration that determine how a bottle connects with its closure.
Choosing the wrong neck finish can lead to loose caps, cross-threading, poor sealing, and leakage during filling, storage, or transportation. For cosmetic brands and packaging buyers, understanding these specifications is an essential step in selecting compatible packaging components.
A neck finish refers to the geometry of the bottle opening where a cap, pump, sprayer, or dropper attaches. Common finish designations use two numbers separated by a slash or hyphen, such as 24/410 or 24-410.
These designations are commonly associated with GPI (Glass Packaging Institute) and SPI (Society of the Plastics Industry) neck-finish specifications. The first number indicates the nominal diameter across the bottle threads in millimeters, while the second identifies the thread and finish configuration.
Take 24/410 as an example:
24: The nominal thread diameter is 24 mm.
410: The thread series identifies a particular neck-finish geometry, including its thread configuration and finish height.
The second number is not a measurement in millimeters. It identifies a standardized finish series.
Two bottles may have the same nominal thread diameter but different finish configurations. That is why matching only the first number is not enough when ordering a pump or cap.
The 400, 410, and 415 series are common continuous-thread finishes, but their geometry differs.
Thread series | Typical thread turns | Key characteristic |
400 | About 1 turn | Shorter finish configuration |
410 | About 1.5 turns | Medium-height finish |
415 | About 2 turns | Taller finish configuration |
These turn counts are common industry descriptions, not a substitute for the relevant dimensional drawing. A 430 finish, by contrast, is associated with a buttress-style thread configuration and should not be confused with the 400 series.
The 400 series typically features one full thread turn and a relatively short finish. It is used in various packaging applications, depending on the container design and closure requirements.
When specifying a 400 finish, confirm that the closure is designed for the exact diameter and finish dimensions rather than assuming it will fit a similar-looking 410 bottle.
The 410 series typically features approximately one and a half thread turns. It is widely used in cosmetic and personal care packaging, including bottles fitted with lotion pumps, mist sprayers, and dispensing closures.
Common examples include toner bottles, body lotion bottles, facial mist bottles, and liquid soap containers. The actual application depends on the bottle size, closure design, and dispensing requirements.
The 415 series typically features approximately two thread turns and a taller neck-finish configuration than the corresponding 400 or 410 series.
It can be found on selected small bottles, dropper packaging, and other containers designed for compatible closures. Some child-resistant closures use specialized neck finishes, but 415 alone does not mean a closure is child-resistant. Child resistance depends on the complete closure design and applicable testing.
A bottle with a 24/410 neck and a bottle with a 24/415 neck may have the same nominal thread diameter, but their finish geometry differs.
Using a closure designed for the wrong finish may result in:
Poor thread engagement: The closure may not tighten correctly.
Uneven sealing: The sealing surface or liner may not engage as intended.
Cross-threading or closure tilt: The cap may not align properly during application.
Leakage risk: The assembled package may fail under storage or transport conditions.
For this reason, a 24/410 pump should not automatically be treated as compatible with a 24/415 bottle. Confirm compatibility using the specified drawings and physical samples before production.
The following table provides a practical starting point when sourcing packaging components. These are illustrative applications, not fixed capacity-to-neck-size rules.
Neck finish | Potential applications |
18/415 | Small dropper bottles, selected serum or essential oil packaging |
20/410 | Facial mists, toner bottles, selected serum and lotion bottles |
24/410 | Lotion bottles, hand-care packaging, selected body-care containers |
28/410 | Shampoo, body wash, lotion, and other personal care bottles |
33/410 | Selected larger containers and refill packaging, subject to closure availability |
The appropriate neck finish depends on the bottle's design, capacity, material, filling process, and required closure. For example, a 100 ml bottle may use different neck finishes depending on whether it is designed for a pump, spray, dropper, or screw cap.
Always confirm the exact finish with the packaging supplier instead of selecting a closure based on capacity alone.
A neck-finish code provides a useful starting point, but it does not communicate every dimensional detail. Technical drawings also define measurements that influence how the bottle and closure fit together.
<text weight="medium">Key neck-finish dimensions</text>
T dimension: The outside diameter across the bottle threads. Its tolerance is important for closure fit.
E dimension: The outside diameter measured across the neck at the thread roots.
I dimension: The inside diameter of the bottle opening, which can affect filling-tube clearance and the fit of certain plugs or dispensing components.
H dimension: The height of the neck finish.
S dimension: The distance from the top of the finish to the top edge of the first thread. It influences thread engagement and closure orientation.
These dimensions are defined in technical neck-finish specifications. Their tolerances help determine whether a closure can engage correctly and achieve the intended seal.
This also explains why two components labeled with the same nominal finish should still be checked for compatibility. Material, manufacturing tolerances, sealing design, and closure construction can all affect the final result.
Check both numbers on the bottle and the pump, sprayer, dropper, or cap. Do not select components based only on nominal diameter or appearance.
If the supplier uses a drawing or specification sheet, verify that the bottle and closure are designed to work together.
Sourcing the bottle and closure from one supplier can simplify compatibility control, but it does not eliminate the need for testing. When components come from different manufacturers, dimensional verification and sample testing become especially important.
Check thread engagement, closure alignment, sealing performance, and dispensing function. For liquid products, conduct appropriate leakage tests under conditions relevant to the intended application.
For production lines, closure application torque should be validated for the specific bottle and closure combination.
Insufficient torque may result in an inadequately secured closure or incomplete sealing.
Excessive torque may damage threads, deform components, affect liners, or make opening difficult.
There is no single torque value suitable for every cosmetic package. Establish the target range through component specifications and production trials, then monitor it during filling.
At BEYAQI, selecting a suitable bottle and closure involves checking more than the neck-finish code. The bottle design, pump or sprayer structure, sealing method, formula characteristics, and filling requirements all influence the final packaging solution.
For cosmetic brands, distributors, and contract manufacturers, confirming neck-finish compatibility early can help reduce assembly issues, leakage risks, and unnecessary changes during mass production.
When requesting a packaging quotation, provide the required neck finish, bottle capacity, formula type, closure style, and filling requirements. If you already have a preferred pump or cap, sharing a sample or technical drawing can help the supplier evaluate compatibility more accurately.
The number 24 indicates a nominal thread diameter of 24 mm. The 410 identifies the neck-finish series, which typically has approximately one and a half thread turns and a defined finish geometry.
Do not assume that these components are interchangeable. Although they share the same nominal diameter, their finish geometry differs. Confirm the match through supplier specifications, dimensional drawings, and sample testing.
Yes, these are commonly used continuous-thread finish series. However, their geometry differs. The 430 series, for example, is associated with a buttress-style finish rather than the standard 400 configuration.
No. A matching code is an important compatibility requirement, but leak performance also depends on tolerances, the sealing interface, liners or gaskets, closure design, application torque, formula compatibility, and test conditions.
Using one supplier can simplify coordination and reduce the risk of mismatched components. However, the most important step is to verify the actual bottle-and-closure combination through drawings, samples, and appropriate performance tests.
Understanding cosmetic bottle neck finishes helps packaging buyers make better sourcing decisions. By matching the complete specification and validating the assembled package, brands can improve closure compatibility, support reliable filling operations, and reduce avoidable packaging problems.
