MIL-DTL-24044 Flanges, Coaxial Line, Rigid, Air Dielectric, General Specification ForThis specification covers the general requirements for flanges that are used with 50 and 75 ohm, rigid, air dielectric, coaxial transmission lines and parts.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12

MIL-DTL-24044C

3.2.1.3 Forging. When fabricated by forging, flanges shall be made of leaded brass conforming to alloy 2 of

Publication ASTM-B124, or naval brass conforming to alloy A, half-hard, of ASTM-B21.

3.2.2 Aluminum-base alloys.

3.2.2.1 Bar stock and forging. When fabricated from bar stock or by forging, flanges shall be made of aluminum

alloy 6061, temper T6, in accordance with ASTM-B211.

3.2.2.2 Sand casting. When fabricated by sand casting, flanges shall be made of aluminum alloy C4A, condition

T4; alloy CS43A, condition F; alloy ZG61A, condition T5, or alloy ZG61B, condition T5 in accordance with ASTM-

3.2.2.3 Die casting. When fabricated by die casting, flanges shall be made of aluminum alloy G8A or alloy SG100A

in accordance with ASTM-B85/B85M.

3.2.2.4 Permanent mold casting. When fabricated by permanent mold casting, flanges shall be made of aluminum

alloy SG70A, condition T6, or alloy ZC60A, condition T5 in accordance with ASTM-B108/B108M.

3.2.2.5 Finish. When fabricated of aluminum alloy, flanges shall have the finish E-513 specified in MIL-DTL-

3.2.3 Gaskets. "O" ring gaskets supplied with flanges shall be made of silicone rubber conforming to class 2B,

grade 50, of Commercial Item Description A-A-59588 (see 3.1).

3.2.4 Inner connector. The inner connector used with the flanges shall be made of phosphor bronze or free-cutting

brass in accordance with ASTM Designation B-103 or B-16, as applicable, silver plated in accordance with ASTM-

B700. Contact surfaces shall have a 32-microinch finish, or better, before plating (see 3.1).

3.2.5 Insulator. The inner connector insulator shall be made of polytetrafluoroethylene conforming to ASTM-

3.2.6 Locating pin. The locating pin shall be made of corrosion-resisting (stainless) steel, type 303 of ASTM-A269

(see 3.1).

3.2.7 Bolts. The bolts, nuts, and lock washers supplied with flanges shall be made of corrosion-resisting

(stainless) steel, type 303 or 316 in accordance with ASTM-A269 (see 3.1).

3.2.8 Dissimilar metals. Unless suitability protected against the electrolytic corrosion, dissimilar metals shall not

be used in contact with each other (see 6.5.1).

3.2.9 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 6.7).

3.3 Interface and construction. Flanges shall be of the interface, construction and physical dimensions specified

(see 3.1).

3.3.1 Condition. When specified (see 6.2), flanges shall be annealed before finish machining.

3.3.2 Threaded parts. All threaded parts shall be in accordance with FED-STD-H28.

3.4 Surface roughness. When surface roughness is determined as specified in 4.6.4, all finished mating and inner

surfaces of the flanges shall be 63 root mean square microinches or better.

3.5 Voltage standing wave ratio (VSWR). When tested as specified in 4.6.2 or 4.6.2.1 the indicated VSWR of the

insulator bullet assembly and the flanges shall not exceed 1.03:1.