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.

The type designation shall be in the following format:

The lead cross section shall be identified by a single letter symbol as follows:

R - Rectangular.

S - Square.

W - Wire (round or circular).

X - Other (as specified).

The lead size shall 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.

The lead composition shall be identified by a single letter symbol as specified in 5.1.

The final finish for leads shall be identified by a two-number code as specified in 5.2.

The underplating type and thickness shall be identified by a one or two digit alpha-numberic code as specified in 5.2.1. TABLE I. Nominal size (for information only).

Wire size Diameter in Diameter in AWG (B and S) inches millimeters -------------------------------------------- 1 0.289 7.34 2 0.257 6.53 3 0.229 5.82 4 0.204 5.18 5 0.181 4.60 6 0.162 4.11 7 0.144 3.65 8 0.128 3.25 9 0.114 2.90 10 0.101 2.57 11 0.090 2.29 12 0.080 2.03 13 0.072 1.83 14 0.064 1.63 15 0.057 1.45 16 0.050 1.27 17 0.045 1.14 18 0.040 1.02 19 0.035 0.89 20 0.032 0.81 21 0.028 0.71 22 0.025 0.64 23 0.022 0.56 24 0.020 0.51 25 0.017 0.43 26 0.015 0.38 27 0.014 0.36 28 0.012 0.30 29 0.011 0.28 30 0.010 0.25 31 0.008 0.20 32 0.008 0.20 33 0.007 0.18 34 0.006 0.15 35 0.005 0.13 36 0.005 0.13 37 0.004 0.10 38 0.004 0.10 39 0.003 0.08 40 0.003 0.08