The inch is the commonly used unit for most metric engineering drawings.

More Questions from Dimensioning

• It is more difficult to manufacture a part designed using two decimal places than the same part using four decimal places.
• Longer dimension lines are nearest the object outline.
• Avoid dimensioning to hidden lines.
• Most mechanical drawings will include tolerance information in or near the drawing title block.
• Typically, all dimension values and notes are lettered horizontally and should read from the bottom of the sheet.
• A set of two mutually perpendicular datum planes is required for coordinate dimensioning.
• When a finished part is measured, it may vary slightly from the exact dimension specified.
• The American Society of Mechanical Engineers provides a set of common standards used by industry for placement of dimensions.
• Fillet radii can be given in a general note.
• It is permissible to letter a dimension value over any line on the drawing.

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