MIL-DTL-28693A
NOTES
1. Dimensions are in inches.
2. Metric equivalents are given for information only.
3. All diameters shall be concentric within .010 inch (0.25 mm) TIR.
4. Tolerances shall be ±.005 on decimals and ±1/64 on fractions.
5. All grove surfaces shall be .63 .
6. All dimensions shall be in accordance with MIL-C-24356, except J (5.60 min inch), L (1.72 inch),
and M (1.87 inch) dimensions shall be as specified herein to assure clearance for installation of
hose support ring.
7. Material composition for end coupling body and nipple shall be wrought aluminum alloy (6061-T6).
FIGURE 1. Couplings - Continued.
3.5.2 Split clamp and band assembly. One 6-inch split clamp and band assembly in accordance
with MIL-C-24356, consisting of an "O" ring, two split clamp halves, one band and all necessary screws
shall be provided with each length of hose.
3.6 Performance.
3.6.1 Visual examination. The hose assembly shall conform to the requirements of this specification
when visually examined as specified in 4.7.1.
3.6.2 Weight. The unit weight of the hose, without couplings, shall be not more than 4.0 pounds
(1.81 kg) per foot (30.5 cm) when measured in 4.7.2. The entire lot shall be rejected if any sample hose
fails to meet the requirement for unit weight.
3.6.3 Proof pressure. The hose shall withstand a proof pressure of 300 psig (21.09 kilogram per
3.6.4 Dimensional stability. When tested in 4.7.4, the hose shall not increase in length more than
15 percent nor increase in outside diameter more than 18 percent, nor shall the twist be more than 0.5°
per foot (30.5 cm) while under pressure. The hose shall not retain more than 5 percent change in length
or 3 percent change in OD after releasing the pressure. All calculations shall be based on the original
dimensions of the hose.
3.6.5 Air pressure. Hoses, inside and outside, shall be free of any blisters or other evidence of
disruption when tested in 4.7.5.
3.6.6 Burst pressure. A sample of the hose shall not burst at less than 600 psig (4.2 MPa) when
tested in 4.7.6.
3.6.7 Tensile pull. The hose shall be capable of withstanding a tensile pull of 12,000 lbs (5443 kg)
for 5 minutes, and shall have a breaking tensile of not less than 16,000 lbs (72.57.5 kg) when tested in
4.7.7. At the 12,000-lb (5443 kg) tensile pull there shall be no apparent damage to the hose or
weakening of the coupling grips.
3.6.7.1 Elongation. The hose shall have an elongation of not more than 10 percent when loaded to
6,000 lbs (2721.5 kg) in 4.7.7.
3.6.8 Flexibility. The hose shall have sufficient flexibility to collapse to 2.5 inches (63.50 mm) in
cross-sectional height, under an applied load of 100 lb (45.4 kg), when tested in 4.7.9. The specimen
may be tested in any convenient orientation that conforms to the requirements of 4.7.9.
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