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We do the same thing if a drawing can define a part with different length options, or different hole locations or anything that changes but is based on the same drawing. So for us, a drawing number can define multiple part numbers. The part numbers are for a specific configuration of the drawing.

Relationship of part numbers to drawing numbers For example, drawing number 12345 may show an assembly, P/N 12345-1, which comprises detail parts -2 ("dash two"), -3, -4, -8, and -11.

The height of the letters and numerals for engineering drawing can be selected from 2.5, 3.5, 5, 7, 10, 14 and 20 mm ing to the size of the drawing. The ratio of height to width varies but in case of most of the letters it is .

The drawing number is used primarily for sheet to sheet linking, typically in, but not limited to, section details, section cuts, and detail callouts. Drawing Numbers are placed in CAD files, they consist of the discipline/sheet type designator followed by a hyphen and a number.

Lettering A CharacteristicParameterRatioLettering Height (Height of capitals)h(14/14)hHeight of lower case letters (without stem or tail)c(10/14)hSpacing between charactersa(2/14)hMinimum spacing of base charactersb(20/14)h2 more rows

General rules for Lettering in Engineering drawing Words should be placed one letter apart. The letters should be spaced in such a way that the area between letters is almost equal. Letters and numerals should not touch each other and should not touch the lines.

Drawing number is generally a unique filing identifier. It is the number assigned to the drawing generated for a particular component. It may be unique in relation to the part number. As a rule, each organization has its numbering framework for specialized drawings.