MIL-PRF-26626F
operational use or storage. The use of toxic chemicals, hazardous substances, or ozone depleting
chemicals shall be avoided, whenever feasible.
3.3.1 Safety specific materials. All materials used shall be capable of operating safely
in a pure oxygen environment without creating health or fire hazards (see 6.8).
3.3.2 Ozone resistance. Elastomers and inner lining materials shall be ozone resistant
(see 4.6.12).
3.3.3 Lubricants. Lubricants, if used, shall meet the requirements of MIL-PRF-27617.
These lubricants shall be used only on mating surfaces, such as the threads of the AN818
coupling nut (see 6.7).
3.4 Interface.
3.4.1 End fittings. Flared fitting inserts shall conform to SAE AS4395 and shall be
constructed of material conforming to Class 304 or Class 316 of SAE AMS-QQ-S-763 or
constructed from materials with equivalent properties and composition. Coupling nuts shall
conform to AN818 (see figure I). End fittings shall be permanently attached to the hose assembly
(see 6.5 and 6.8).
3.4.2 Insert retainer. The insert retainer, if used, shall conform to the tolerances on
figure I.
3.4.3 Threads. All threads shall conform to SAE AS8879, except the maximum pitch
diameter may be exceeded by 10 percent.
3.5 Performance.
3.5.1 Dimensions. The hose assembly shall conform to the dimensions shown in figure
I.
3.5.2 Inner liner. The hose liner, if used shall be seamless and smooth bored (see 6.4
and 6.6).
3.5.3 Proof pressure. The hose assembly shall withstand a proof pressure of 1,000 psig
(see 4.6.2). The leak rate shall be less than 2 cubic centimeters (cm3) per minute (see 6.8).
3.5.4 Burst pressure. The hose assembly shall withstand a hydrostatic pressure of 2,200
psig (see 4.6.3). The leak rate shall be less than 2 cm3 per minute (see 6.8).
3.5.5 Ultimate tensile strength. The hose assembly shall not break when subjected to a
tensile load of 300 pounds (see 4.6.4).
3.5.6 High temperature. The hose assembly shall withstand exposure to 260o + 5oF for
48 hours (see 4.6.5).
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