- What do the different sizes of snaps mean ? It is industry standard to refer to snaps by “size,” according to their cap diameter. However, this “size” does not correspond to any actual measurements. For example, size 20 snaps have a cap diameter of 12.4mm. It is important never to confuse a snap’s “size” with their actual measurements.
Size | Cap Diameter | Prong Length |
14 | 9.74mm | 3mm |
16 | 10.7mm | 3mm |
20 | 12.4mm | 5mm |
24 | 15mm | 5mm |