What Are Diameter of A Beer Bottle Cap

When most people think of beer, the first thing that comes to mind is its refreshing taste and dense foam, but few pay attention to the tiny cap at the mouth of the bottle. The size of a beer bottle cap is far from insignificant—it not only affects the beer's seal and freshness, but also directly impacts the opening experience and drinking safety.

As a key component of beer packaging, the dimensional design of aluminum beer bottle caps adheres to strict industry regulations and company standards. Every parameter is repeatedly measured and verified in practice to ensure a perfect fit with the beer bottle. Currently, the main dimensions can be summarized into the following three core dimensions:

1. Diameter

The outer diameter (OD) of aluminum beer bottle caps (i.e., the outermost diameter of the cap) is typically around 32mm. This precisely matches the neck diameter of most standard domestic beer bottles (approximately 30mm). This ensures a secure fit while avoiding material waste due to oversize or a poor seal due to undersize.

The inner diameter (the diameter of the inner side of the cap that contacts the bottle neck) of the cap is controlled between 30.2-30.5mm, allowing a slight gap of 0.2-0.5mm. This allows for quick insertion of the cap onto the bottle neck on the production line and allows compression of the internal sealing gasket during the capping process, creating a "zero-gap" seal and preventing carbon dioxide leakage from the beer or air ingress.

2. Height

The overall height of the aluminum beer bottle cap (from the top to the bottom edge) is approximately 11-12mm. This height design reflects two considerations: first, it provides enough space for the internal sealing gasket (approximately 2-3mm thick), ensuring compression and enhancing sealing performance; second, the 11-12mm height is ergonomic, providing a comfortable feel when prying with a bottle opener or using a finger grip to assist in opening the bottle, and preventing slipping and scratching of fingers caused by the cap being too thin.

3. Thickness

The top of the bottle cap is approximately 0.3-0.4mm thick, while the rim is slightly thicker, at approximately 0.5-0.6mm. This "thin center, thick rim" design is not arbitrary: the thinner top reduces material usage, achieving lightweighting and lowering packaging costs; the thicker rim enhances the overall strength of the cap, preventing deformation during transportation and storage due to squeezing, which could compromise the seal. Furthermore, the rim thickness matches the capping machine's pressing parameters, ensuring a tight fit and a strong seal.

Types of aluminum beer bottle caps

In beer packaging, there are several types of aluminum beer bottle caps. The crown cap, a classic, has long dominated the market with an outer diameter of approximately 32mm and a height of 11-12mm to fit common bottle openings.

The open-top lid is compatible with cans, and its 5-8mm height allows for easy opening outdoors. The anti-theft lid, with its additional anti-theft structure, is primarily used for high-end beers. The screw top beer bottles has a wide range of applications and is already used on some products from brands like Blue Ribbon Beer and Liquan Beer (Yanjing). It fits common calibers like 28mm and 38mm, and its 15-18mm height allows for a high-quality seal that maintains a good seal even after high-temperature sterilization.

Consumers can easily unscrew and tighten without the help of tools. It is especially suitable for family gatherings, picnics, etc. where multiple openings and closings are required to preserve remaining beer, or scenarios where there are high requirements for the convenience of opening bottles. It greatly improves the convenience of drinking and the beer preservation effect.

As one of the big beer bottle cap manufacturers, Haomei Aluminum provides factory price for bulk orders. Welcome to tell us your requirements, we can arrange production according to your needs.

Original source: https://www.alubottlecaps.com/a/what-are-diameter-of-a-beer-bottle-cap.html

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