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What do the numbers in the joint sizes actually indicate?

April 26, 2017actually indicate Joint Numbers

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What do the numbers in the joint sizes actually indicate?

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The number format of glass joints are normally presented as follows: (e.g. 24/40). The first number represents the outer diameter (OD) in millimeters (mm) at the base (widest part) of the inner joint. The second number represents the ground glass length of the joint in millimeters. The most common joints are 14/20 and 24/40. There are also European ISO standard joints with common joint sizes of 10/19, 14/23, 19/26, 24/29 and 29/32. The US and ISO joints differ only in the length not in the slope, and can be used in combination with one another.