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How many letters can I fit on a M22 standard legend plate insert, part# M22-XST-ETCH?

Using letter height of 3mm, you have a max of three lines that can have up to 12 characters per line.  For 5mm tall lettering, you have 2 lines, max of 8 characters per line.  Specify letter height and if application, designate LINE 1, LINE 2 on the order.   If it's only one line of text they will center it.