Differentiate Between Thread 410 and Thread 400
Core Pain Point Scenarios
Clearly using 20-caliber bottles and pumps, but why can’t the bottles from Factory A fit tightly with the pumps from Factory B, resulting in leakage when inverted, and all the upfront costs go down the drain? Don’t just focus on the superficial number "20mm"! The real "devil in the details" that determines compatibility is the numerical code following it—it’s the pitfall-avoidance code in the packaging materials industry.
First, Understand the Core: How to Read a Model Like 20/400?
For example, "20/400" is read as "twenty dash four hundred". The numbers before and after represent different key parameters: one determines "whether it can be installed", and the other determines "whether it can be sealed tightly".
1. The First Number: Represents the Bottle Mouth Diameter, Determining "Whether It Can Be Installed"
Take the "20" in "20/400" as an example—it refers to the outer diameter of the bottle mouth thread, commonly known as the "T-value" in the industry, with the unit of millimeters (mm). This is the most basic prerequisite for compatibility—if this number doesn’t match, the cap can’t even be put on the bottle, let alone achieve sealing.This is related to the selection of lotion pump factory, plastic bottles supplies, wholesale empty plastic bottles and plastic empty bottles wholesale.
2. The Second Number: Represents the Thread Style, Determining "Whether It Can Be Sealed Tightly"
This is the "deadly trap" ignored by 99% of purchasers and newcomers! Numbers like "400" and "410" specify core parameters such as the number of thread turns and thread profile, directly determining the quality of the sealing effect. According to universal industry standards, common thread styles have the following differences:
400 Type: Standard thread with only 1 turn and a relatively simple structure. It is usually used for ordinary cream caps, basic screw caps and other scenarios with low sealing requirements.
410 Type: Thread with 1.5 turns, deeper threads and tighter engagement. It is a commonly used standard for packaging materials requiring frequent pressing and leak-proofing, such as spray pumps and lotion pump. If you are looking for a lotion pump supplier or lotion dispenser pump manufacturers, be sure to confirm this specification.
415 Type: Thread with 2 turns and extremely strong sealing performance. It is suitable for high-end serums, active ingredient skincare products and other products requiring strong freshness preservation.
⚠️ Key Takeaway: A cap with 410 thread (e.g., a pump head) cannot be screwed onto a bottle with 400 thread! The bottle only has 1 thread turn, so the cap cannot be screwed all the way down, the sealing ring cannot be compressed tightly, and leakage is inevitable (a gasket is required to adjust the sealing performance). Whether it is a lotion pump or cap from bottle cap wholesale supplies or bottle closures manufacturers, it must be matched correctly.
Pitfall-Avoidance SOP: 3 Steps to Eliminate Packaging Compatibility Issues
Mistakes in packaging compatibility often lead to batch losses. To avoid problems from the source, follow these steps:
Reject the "one-size-fits-all mindset" and confirm specifications before purchasing: Molds vary among different factories. Confirm in advance whether the product specifications of plastic lotion pump suppliers, bottle cap manufacturing companies or plastic caps and closures manufacturers match your bottles.
Mandate cross-testing and verify before signing contracts: When sourcing bottles and caps from two different factories (Factory A and Factory B), request samples from both parties. Conduct fit tests (check if it can be screwed smoothly to the bottom), inversion tests (observe for leakage after 24 hours of inversion) and vacuum tests (check for leakage under negative pressure for 5 minutes) by yourself. Only sign the contract after confirming compatibility. This also applies when cooperating with a lotion pump factory.
Clarify the sample-sealing standard and lock in tolerance limits: When confirming samples with the factory, seal the "final sample" as the standard for mass production quality control (QC), to prevent compatibility failure caused by excessive tolerances in the mass-produced goods delivered by the factory.
Remember: The core of packaging compatibility is not "matching diameter", but the dual matching of diameter + thread style. Next time you select packaging materials, check the complete model before placing an order—no more worrying about leakage pitfalls!
