{"id":17055,"date":"2026-08-14T17:36:18","date_gmt":"2026-08-14T17:36:18","guid":{"rendered":"https:\/\/bral-max.com.br\/?p=17055"},"modified":"2026-09-29T16:47:33","modified_gmt":"2026-09-29T19:47:33","slug":"roscas-18-410-vs-18-415-como-escolher","status":"publish","type":"post","link":"https:\/\/bral-max.com.br\/en\/roscas-18-410-vs-18-415-como-escolher\/","title":{"rendered":"How to Choose Between 18\/410 and 18\/415 Threads, and the Main Differences Between Them"},"content":{"rendered":"

Anyone who works with vials and caps knows how a small detail can make all the difference. Sometimes, the diameter seems right, and the sample fits visually, but the seal doesn\u2019t deliver the expected result. This has been the case in many projects we\u2019ve overseen over the years at Bral-Max. The reason almost always lies in an incomplete reading of the thread.<\/p>

A principal diferen\u00e7a entre 18\/410 e 18\/415<\/a> est\u00e1 no perfil da tampa: a 18\/410 \u00e9 mais baixa e a 18\/415 \u00e9 mais alta por dentro.<\/strong><\/p>

Isso parece simples. E \u00e9. Mas esse detalhe interfere no encaixe, na apar\u00eancia da embalagem e at\u00e9 na escolha do conjunto com v\u00e1lvulas, batoques<\/a> ou aplicadores. Quando entendemos essa diferen\u00e7a com clareza, a decis\u00e3o fica mais segura.<\/p>

\"How<\/p>

What do the thread numbers mean?<\/strong><\/h2>

Before comparing the two standards, it\u2019s worth clarifying the terminology. In the code 18\/410 or 18\/415, the number 18 indicates the internal diameter of the thread, in millimeters. In other words, we\u2019re talking about containers with an 18-mm opening.<\/p>

Numbers 410 and 415, on the other hand, refer to the thread finish and the cap profile. In practice, this is where the difference that causes the most confusion in the market lies.<\/p>

Same diameter. Different profiles.<\/blockquote>

In our day-to-day work, we see many people assume that the 18\/410 and 18\/415 differ only in their trade names. They do not. They have different internal heights, and this affects the compatibility of the closure.<\/p>


<\/p>

Practical difference between 18\/410 and 18\/415<\/strong><\/h2>

The easiest way to understand this is to imagine two lids with the same diameter but different internal heights.<\/p>

The 18\/410 thread has a lower profile, while the 18\/415 has a higher profile, with the thread positioned higher up on the inside of the cap.<\/strong><\/p>

This changes the shape of the bottle and the way it fits into the bottle neck. In general, the 18\/415 appears taller, while the 18\/410 tends to look more compact.<\/p>