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MIL-PRF-62410 Tube Assembly Metal: Swaged Hydraulic, \(M1, Tank\)This specification covers the performance, design, and test requirements for swaged hydraulic tube assemblies which provide hydraulic fluid, under pressure, to vehicle hydraulic system components. Tube assembly is swaged, separable, flareless type, and threaded one end to allow connection to standard fitting \(see 6.2\).

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MIL-PRF-62410B(AT)

TABLE II. Tube insertion length.

Tube insertion length

Tube size O.D.

Minimum

Maximum

(inch)

(cm)

(inch)

(cm)

(inch)

(cm)

1/4

(0.635)

0.615

(1.56)

0.915

(2.32)

3/8

(0.9525)

0.690

(1.75)

0.990

(2.51)

1/2

(1.27)

1.193

(3.03)

1.493

(3.79)

3/4

(1.905)

1.303

(3.31)

1.603

(4.07)

(2.54)

1.448

(3.68)

1.748

(4.44)

3.4 Performance.

3.4.1 Leakage.

3.4.1.1 Tube assembly. When mated with appropriately sized fittings

(see SAE AS33514), the threaded and swaged assembly shall show no evidence of leakage or

permanent deformation when subjected to hydrostatic pressures up to 1650 psig (11.37 MPa)

(see 4.7.10).

3.4.2 Proof pressure. The tube assembly, when mated with appropriately sized fittings

(see SAE AS33514) shall withstand a 3000 psig (20.7 MPa) minimum pressure for not less than

5 minutes. There shall be no evidence of external leakage or permanent deformation

(see 4.7.11).

3.4.3 Burst pressure. The tube assembly, when mated with appropriately sized fittings

(see SAE AS33514) shall withstand a minimum burst pressure of no less than 6000 psig

(41.37 MPa). There shall be no evidence of external leakage or rupture at any pressure below

the specified burst pressure. Assemblies used for verification of compliance to the burst pressure

and endurance requirements shall be indelibly marked to prevent their use in functional systems

(see 4.7.12).

3.4.4 Endurance. The tube assembly shall be capable of withstanding 200,000 impulse

cycles without leakage or failure. The impulse rate shall be 65�5 cycles per minute. Each cycle

shall consist of a rise from 0 pounds per square inch gage (psig) to surge pressure and back to

0 psig. The peak surge pressure shall be within a range from 2475 psig (17.06 MPa) to

2590 psig (17.85 MPa) (see 4.7.13).

3.4.5 Hydrostatic pressure resistance. Tubing shall be capable of withstanding an

internal hydrostatic pressure P, without bulging, leakage, or other defects, except that any

diametric permanent set shall be disregarded. Hydrostatic test pressure shall be calculated

according to the following formula (see 4.7.14):

D2 - d2

D2 + d2

P=S