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Clock and Watch Key Conversion Chart

Large selection of Clock Keys and Watch Keys in stock!


 
CLOCKS
WATCHES
U.S. / English
Euro*
U.S. / English
Euro*
Key Number
Metric (mm)
Inches (.000)
Metric (mm)
Key Number
Metric (mm)
Inches (.000)
Metric (mm)
00
2.2
0.087
2
2
1.15
0.045
1.75
0
2.4
0.094
2.25
3
1.2
0.047
1.65
1
2.6
0.102
2.5
4
1.3
0.051
1.6
2
2.8
0.11
2.75
5
1.4
0.055
1.5
3
3
0.118
3
6
1.5
0.059
1.4
4
3.2
0.126
3.25
7
1.6
0.063
1.3
5
3.4
0.134
3.5
8
1.65
0.065
1.2
6
3.6
0.142
3.75
9
1.75
0.069
1.15
7
3.8
0.15
4
10
1.8
0.071
1.05
8
4
0.158
4.25
11
1.9
0.075
1
9
4.2
0.165
4.5
12
2
0.079
0.95
10
4.4
0.173
4.75
11
4.6
0.181
5
12
4.8
0.189
5.25
13
5
0.197
5.5
14
5.2
0.205
5.75
15
5.4
0.213
6
16
5.6
0.22
6.25
17
5.8
0.228
6.5
18
6
0.236
6.75
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