MIL-DTL-39000C
3.2.1 Copper alloys.
3.2.1.1 Bar stock. When fabricated from bar stock, flanges shall be of leaded red brass, naval brass, or free-
cutting brass.
3.2.1.1.1 Leaded red brass. Composition of material for leaded red brass shall conform to the requirements for
alloy B, half-hard, of ASTM-B140/B140M.
3.2.1.1.2 Naval brass. Naval brass shall be of the composition for alloy A or C, half-hard, of ASTM-B21/B21M.
3.2.1.1.3 Free-cutting brass. Free-cutting brass shall conform to the chemical composition requirements of ASTM-
B16/B16M, half-hard.
3.2.1.2 Casting. When fabricated by casting, flanges shall be of tin bronze conforming to the composition for alloy
1A or 1B of ASTM-B143.
3.2.1.3 Forging. When fabricated by forging, flanges shall be of leaded brass conforming to composition for alloy 2
of ASTM-B124/B124M, or naval brass conforming to composition for alloy A, half-hard, of ASTM-B21/B21M, or free-
cutting brass conforming to composition of ASTM-B16/B16M, half-hard.
3.2.2 Aluminum alloys.
3.2.2.1 Bar stock and forging. When fabricated from bar stock or by forging, flanges shall be of an aluminum alloy
conforming to alloy 6061 of ASTM-B221. Bar stock shall be temper T6.
3.2.2.2 Sand casting. When fabricated by sand casting, flanges shall be of an aluminum alloy conforming to alloy
C4A, condition T4; alloy CS43A, condition F; alloy SG70A, condition T6; or alloy ZG6LA, condition T5, of ASTM-
3.2.2.3 Die casting. When fabricated by die casting, flanges shall be of an aluminum alloy conforming to the
composition for alloy G8A or SG100A of ASTM-B85/B85M.
3.2.2.4 Permanent mold casting. When fabricated by permanent mold casting, flanges shall be of an aluminum
alloy conforming to alloy ZC60A, condition T5; alloy SG70A, condition T6; or alloy SC51A, condition T6, of
Publication ASTM-B108/B108M.
3.2.3 Silicone rubber. When gaskets are required for use with individual types of flanges (see 3.1), the material
shall be silicone rubber conforming to A-A-59588, class 2b.
3.2.4 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin
content of flange components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum
of 3 percent lead, by mass (see 6.5).
3.3 Design and construction. Waveguide flanges shall be of the design, construction, and physical dimensions
specified (see 3.1). Dimensions and tolerances shall be interpreted in accordance with ASME-Y14.5.1M.
3.3.1 Condition. Flanges shall be annealed before finish machining, when specified (see 6.2).
3.3.2 Threaded parts. All threaded parts shall be in accordance with FED-STD-H28.
3.3.3 Cap screws. Cap screws shall be type II, style 10P, grade 8, alloy steel, cadmium plated, in accordance with
FF-S-85 or type VI, alloy steel, cadmium plated, in accordance with FF-S-86, whichever is applicable (see 3.1).
3.3.4 Hexagon nuts. Hexagon nuts shall be type II, style 4, carbon steel, cadmium plated in accordance
with FF-N-836.
3.3.5 Lock washers. Lock washers shall be class A, style 2, cadmium plated in accordance with FF-W-84.
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