MIL-DTL-52618F
3.3.2 Fabrication. The fittings shall be fabricated from aluminum-alloy castings in accordance with
ASTM B26/B26M or ASTM B108/B108M, alloy 356.0-T6, except that the fittings listed below shall be
aluminum fabricated from wrought products indicated herein:
a. All fittings, size 1/4 inch through 1 inch, shall be drawn aluminum tube in accordance with
ASTM B210 alloy 6061-T6.
b. All fittings, size 1-1/4 inch through 4 inches, shall be extruded aluminum tube in accordance
with ASTM B221 alloy 6061-T6.
c. All plugs, size 1/8 inch through 1/2 inch, shall be aluminum rod in accordance with ASTM B211
alloy 6061-T6.
3.4 Design and dimensions. Fittings shall be in accordance with the applicable specification sheets,
see supplement 1.
3.4.1 Design and tolerances. The design and tolerances of the fittings shall be in accordance as
specified herein and applicable specification sheets.
3.4.2 Threads. All threads shall be in accordance with American National Standard Taper Pipe
Thread (NPT) in accordance with ASME B1.20.1, except that couplings, wrought caps, and wrought
bushings in sizes 1/2 inch and under may be American National Standard Straight Pipe (NPSC) thread in
accordance with ASME B1.20.1. Thread length, depth, variation in alignment, countersinking, and
chamfering shall be as specified in ASME B16.3.
3.5 Proof pressure. The fittings shall withstand an internal air pressure of 90 pounds per square inch
gauge (psig) (0.62 MPa) and an internal hydrostatic pressure of 250 psig (1.72 MPa) without leaking or
sweating (see 4.5.3).
3.6 Finish. When specified (see 6.2), fittings shall be anodized in accordance with MIL-A-8625, type
II, class 1, thickness no less than 0.0004 inch (10µm) for castings and no less than 0.0007 inch (18µm)
for wrought products.
3.7 Identification marking. The pipe fittings shall be identified and marked in accordance with
MIL-STD-130.
3.8 Cleanliness. All fittings shall be free of oil, grease, dirt, moisture, cleaning solvents and foreign
materials both internally and externally.
3.9 Workmanship. The finish of cast and extruded fittings shall be workmanlike and free of burrs,
sharp edges, and corners. The fittings shall be free of sand and scale, inclusions, fins, gate protrusions,
cracks, shrinks, and other injurious defects. There shall be no cold shunts, blowholes, porosity, or any
other defects that may affect serviceability.
4. VERIFICATION
4.1 Classification of inspection. The inspection requirements specified herein are classified as
follows:
a. First article inspection (see 4.3)
b. Conformance inspection (see 4.4).
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