Why There Are 21 Serrations on Every Beer Bottle Cap?

12 September, 2023

How do you usually remove the caps of beer bottles when you drink beer, use the bottle opener?pull it hard? or bite it down with your mouth? No matter how you open a beer bottle, it's not what we share today. I dont have an idea whether youve ever noticed the caps of beer bottles whose number of serrations always be 21,and whys that?

Well,in the early 20th century, there were many kinds of serrations on beer bottle caps, including 23,24 sawteeth,etc. But it was later found that the bottle cap with 24 serrations was difficult to open and could easily damage the bottle mouth.

In order to improve the sealing and ease of use of the bottle cap, the bottle caps with 21 serrations were finally determined to be the easiest and safest to open. The bottle caps with 21 serrations are better adapted to industrial production and provide proper sealing and ease of use. The design combines high occlusion with adequate safety. The 21 serrations can make the contact area of each fold on the cap as large as possible, increasing the friction between the cap and the cap to ensure firm.In addition, the 21 serrations on the caps are ergonomic and do not scratch the finger when open.

This design is gradually adopted by various beer manufacturers, and has become a common standard beer bottle cap on the market.Now wherever you are in any city of the world the beer bottle you see always have 21 serrations on its cap,and you can count the serrations of the cap carefully next time you drink beer to find the truth.

  But not every serrated cap of beer bottle is easy to be opened.It generally depends on the material used.As we mentioned before,the caps always be designed with 21 serrations for a secure grip.Beer bottles caps that made from high-quality materials can help withstand even the most demanding conditions.Thick metal are sturdy enough to keep the beer fresh and avoid any accidental impact that may pour the content out.


     The caps above from the company ideabottle, a leading enterprise specializing in the design, research and development, and manufacturing of glass bottles, glass jars, and metal caps, provides customers with one-stop solutions of excellent quality and reasonable prices. Ideabottle gives a wide range of choice in beer bottles and the beer bottle caps to meet your most needs.

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