MIL-STD-1285-SUP-2 Marking of Electrical and Electronic PartsThis standard establishes requirements for the physical marking of electrical and electronic parts. This standard should be implemented by incorporating suitable requirements directly in acquisition documents.

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MIL-STD-1285D

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-  Manufacturer's CAGE code and manufacturer's identifying part number

-  Trademark

-  Date code and lot symbol

-  Characteristics and ratings

-  ESD symbol if required

FIGURE 6.  Method I marking example for vendor item control documents.

6.4.2  Guidance for acquisition document writers.  An acquisition document writer can determine how much of the method I marking can be specified as follows:

a.  Measure the diameter and the length of the part (using the minimum dimensions) and calculate the circumference to three decimal places (two decimal places if metric units are used) by using the formula:

Circumference = diameter (multiplied by) 3.14 (inches)        (inches)

or

Circumference = circumference (multiplied by)  25.4 (millimeters)           (inches)

b.  Select the size of type and the corresponding number of lines that can be marked within a given marking surface using table III.

c.  Find the number of characters for each line from table IV.  (NOTE:  A space is to be counted as a character.)

6.4.2.1  Procedures for using the tables for a cylindrical part with dimensions of 0.091 inch (2.31 millimeters)

diameter and 0.250 inch (6.35 millimeters) lengths. a.  Calculate the circumference as:

Circumference = 0.091 x 3.14 = 0.285 inch or

Circumference = 0.285 x 25.4 = 7.25 millimeters

b.  In table III, find the number equal to or slightly less than .284 (such as, .284 or .278).  Opposite this number at the top of the column is the type size (the type size is 4-point (mini) for .284 and 8-point for .278).  In the left-hand vertical column opposite this number, find the number of lines that can be marked on the part.

For the 4-point (mini) type, the number is 4; and for the 8-point type, the number is 2.

c.  In the 4-point (mini) type column of table IV, find the specified part length (.250).  If this exact number is not in the table IV, find the next lower number.  Opposite this number in the left-hand vertical column is the maximum number of characters that can be marked on each line.

6.4.2.2  Procedures for using the tables for a flat marking surface.  Where the marking surface is flat, use the procedures of 6.4.2.1b and 6.4.2.1c.

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