Watch Key Size Chart

  U.S. / English Euro
Key Number Metric (mm) Inches (.000) Metric (mm)
00 0.95 0.037 2
0 1 0.039 1.9
1 1.05 0.041 1.8
2 1.15 0.045 1.75
3 1.2 0.047 1.65
4 1.3 0.051 1.6
5 1.4 0.055 1.5
6 1.5 0.059 1.4
7 1.6 0.063 1.3
8 1.65 0.065 1.2
9 1.75 0.069 1.15
10 1.8 0.071 1.05
11 1.9 0.075 1
12 2 0.079 0.95