Does 12 mm equal half an inch?

12mm = almost 15/32 inch (= almost 1/2 inch) 13mm = just over 1/2 inch.

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Besides, what is 12mm in standard?

SAE to Metric Conversion Chart

SAE Metric Inch
12mm 0.472
1/2″ 0.5
13mm 0.512
17/32″ 0.531

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