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snap fasteners

In most of the world, snap fasteners are sized by their diameter in millimeters, in increments of whole millimeters. Fasteners from 6 mm to 19 mm are commonly available, and 30 mm are made.

In the United States, snap fasteners are sized in several ways. One is simply the diameter in fractions of an inch. Another is the same system used for buttons, that is, the diameter in lignes (40 lignes = 1 inch). A third system uses defined size numbers.

Snaps from different manufacturers are unlikely to work together, even though they are the same size.

Size in lignes	Diameter, inches	Diameter, millimeters
12	0.30	7.6
14	0.35	8.9
15	0.38	9.5
16	0.40	10.2
18	0.45	11.4
19	0.48	12.1
20	0.50	12.7
24	0.60	15.4

Size	Diameter, inches	Diameter, millimeters
0000 (4/0)	0.235	6.0
000 (3/0)	0.27	6.9
00 (2/0)	0.287	7.3
0	0.35	8.9
1	0.4	10.2
2	0.45	11.4
3	0.5	12.7
4	0.6	15.2

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