Downloaded from https://www.everyspec.com MIL-STD-1311D SECURENESS OF BASE, CAP, OR INSERT 1. Procedure. Unless otherwise specified on the TSS, the tubes shall be tested as indicated in table 1101-I. The immersion bath shall be clear water. After immersion (when required), the tubes shall be cooled at room temperature for at least 1 hour before torque or pull is applied. NOTE: This method is not intended for testing glass or ceramic-to-metal vacuum seals. Methods such as 1116, 1119, 1121, 1126, or 2126 as applicable, should be selected for testing such seals. 2. Measurements.
Upon completion of the required test(s), there shall be no loosening of cemented joints and not more than .031 inch movement of non-cemented mechanical joints. Caps on metal tubes shall rotate not more than 20 degrees. METHOD 1101B TABLE 1101-I. Torque, pull, and immersion requirements. 1/ Receiving tubes: 50 ° C minimum, for 42 hours or boil for 6 hours. Other than receiving tubes: 50 ° C for 18 hours. METHOD 1101B 1101-1 25 March 1970 Component sizes Torque or pull Component designs Torque or pull elements Immersion 1/ Bases Dia. less than 0.65 inch Dia. 0.65 inch to 1.5 inch Dia.
more than 1.5 inch Wafer Caps Caps with diameter of the electrical contact surface equal to .600 inch or less Caps with diameter of the electrical contact surface greater than .600 inch. Pounds-inch 12 20 40 60 (pound pull) 1.5 3 Bases Pin mounted and integral shell Wafer insert Phenolic or ceramic wafer insert on metal tubes Wafer base on metal envelope Caps Cemented Metal tubes Between envelope and: Base or pins (incl guide lug) Insert or pins (incl guide lug) Pins (incl guide lug) Axial pull; wafer or all pins simultaneously Cap Cap Required Required Not required Not required Required Not required