MIL-STD-1276H
1. SCOPE
1.1 Scope. This standard establishes the method of identifying, specifying, and limiting to a minimum the combinations of basic materials, the thickness and composition of the plating used therewith, and the sizes of wire and flat wire (ribbon) leads on electronic and electrical parts when they are to be soldered or welded during assembly in equipment.
1.2 Classification.
1.2.1 Type designation. The type designation will be in the following format:
L |
W |
(X.XX) |
D - 21 |
- A1 |
|
I |
I |
I |
I I |
I |
|
_ I |
I |
I |
_ |
I I |
I |
Lead |
Cross-section |
Nominal |
Composition Final |
Under- |
|
(see 1.2.1.1) |
size |
(see 1.2.1.3) finish |
plating |
||
(see 1.2.1 |
.2) |
(see 1.2.1.4) |
(see 1.2.1.5) |
1.2.1.1 Cross section. The lead cross section will be identified by a single letter symbol as follows:
R - Rectangular. S - Square.
W - Wire (round or circular). X - Other (as specified).
1.2.1.2 Nominal size. The lead size will be identified by the nominal diameter or nominal diagonal in millimeters
(within parentheses) or inches (without parentheses). See table I for a list of suggested nominal sizes.
1.2.1.3 Composition. The lead composition will be identified by a single letter symbol as specified in 5.1.
1.2.1.4 Final finish. The final finish for leads will be identified by a two-number code as specified in 5.2.
1.2.1.5 Underplating. The underplating type and thickness will be identified by a one or two digit alpha-numeric code as specified in 5.2.1.
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