What is a bong cut and what is it good for?

What is a cut and what is it good for?

The bong joint is a crucial component of glass bongs – even if it appears small and inconspicuous. It connects various bong components, such as the bowl, chillum, and bong body, and ensures an airtight fit. Your bong will only function optimally if the joint is correctly applied and kept clean.

What is a cut?

A ground joint is a standardized, conical glass connection. In bongs, it's primarily used where two glass components need to be firmly but detachably connected—for example, the connection between the bong bowl and the bong opening.

It looks like a circular glass attachment, usually with a slight cone, into which the bowl (or chillum) fits precisely. Thanks to this system, the structure is stable, airtight, and easy to clean or replace.

Why is the cut so important?

• Tightness: Only with a well-made and clean cut will the airflow remain tight and even – this is crucial for a good smoke draft.
• Flexibility: Grindings allow you to easily replace or upgrade various parts such as heads, pre-coolers or ash catchers.
• Safety: A clean seat prevents components from slipping or tipping during lifting.

The most common cut sizes for bongs

There are three main sizes you should know:

• NS 14.5 (also “14mm cut”): Very popular, rather narrow, for smaller bowls or compact bongs.
• NS 18.8 (also “18mm cut”): The standard for larger bongs – more airflow, more volume.
• NS 29.2: Less common, for particularly large or specialized bongs.

Tip: The cut size must always match, otherwise the pieces will not fit together!

How do I recognize a good cut?

• Smooth and precise fit: No wobbling or play between the components.
• No visible gap: The transition between the bowl and the bong should be seamless.
• Easy to release, but stable: The head should not be stuck, but also not wobble.

The bong joint is the connecting link between your most important bong parts. When properly crafted and the correct sizes are used, it ensures tightness, stability, and flexibility while smoking. If you regularly use different bowls or pre-coolers, you should look for high-quality joints – for a reliable and enjoyable smoking experience.

Please also visit our separate page on the topic of cuts under “ Bong cut simply explained ”.