Joint Sizes Measuring Guide – Glass Bongs Australia

One of the most common difficulties people face when trying to purchase new spare parts is knowing the difference between joint sizes, how to measure them and their applications and compatibility. Here, we will detail common smoking accessories like stems, cone pieces and their compatibility.

Female vs. Male Glass Joints

Bongs, cone pieces, nails, ash catchers, adaptors, downstems and all other bong accessories have either a male or female joint. All you need to know, is that male pieces go into female joints and female pieces sit on top of male joints. For example, if your bong has a female joint, you will require a male jointed accessory and vice versa.


Female glass joints are the most common style of joint that you will see on the market. This is the joint that most bongs and downstems have. They are identified by their ability to allow a male glass joint to fit inside of it. As an example, a standard cone piece with a male joint will fit in to the female joint.


Although male glass joints are not as prevalent on the market as female joints, they are definitely growing in popularity. Male glass joints are those that you will usually see on oil and concentrate rigs, usually with an in-built stem. The male joint is however, the most common accessory joint, meaning that most cone pieces are a male joint that fit in to the female joint found on most glass bongs.

Male and Female Glass Cone Pieces

Glass Joint Sizes

Before you go ahead and buy a new cone piece, stem, dome and nail or percolator for your bong or dab rig, you will need to know its joint size. Bong joint sizes come in three different sizes: 10mm, 14mm or 18mm. The most common joint size is 14mm, you will rarely see 10mm joints and 18mm joints are usually only found on the biggest sized bongs or dab rigs.

Note: If you notice anywhere that lists 14.5mm or 18.8mm joints, don't get confused as these are the same as 14mm and 18mm joints.

10mm Joint

Often referred to as micro/nano joints, 10mm joints are those usually found on oil rigs or the smallest dab rigs designed for portability. A 10mm joint is easily identifiable due to its extremely small appearance.

14mm Joint

The most common of all joint sizes is 14mm. This is because almost all small to medium sized bongs and dab rigs have this joint size.

18mm Joint

18mm joint sizes are usually only found on the largest bongs or thick dab rigs. The purpose of this is to increase airflow as the piece is much larger.


How To Measure Glass Joints

Female Joints

For female joints, measure the inner diameter of the top of the female joint. There may be some slight variations between different joints, however the measurement closest to 10mm, 14mm or 18mm will be the correct size of the joint.

Male Joints

For male joints, measure the outer diameter of the widest part of the joint. Again, there may be some slight variations between different joints, however the measurement closest to 10mm, 14mm or 18mm will be the correct size of the joint.

Female and Male Joint

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