Ground joints are very common in laboratory glassware. Sometimes it’s not completely clear to users how to determine the size they need, so here’s some explanation for a ground joint NS29/32;
NS stands for “NormalSchliff”
29 says 29 is biggest diameter A
32 is length B of the grounded part. So in short it’s NS A/B.
It’s common to round the diameter in describing the ground joint. For instance; standard Diameters are 29.2mm, 18.8mm and 14.5mm. These will be referred to as NS29, NS19 and NS14.
Commonly used ground joints are;
But they are standard available from NS5/13 up to NS100/60.
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