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MIL-S-64052
centered to the functional exterior surface of the fluid nozzle within plus/minus
0.001 inch.  The annular radial opening between the center hole of the air cap and
the functional external surface of the fluid nozzle, shall not deviate more than
0.0015 inch when measured around the annular radial opening (see Figure 4, 3.13.4
and 3.13.5).  The spray gun shall include a pop-off pressure safety relief valve
(see 3.13.2).
3.3 Interchangeability.  All parts of the spray gun shall be manufactured to
definite standards and tolerances.  All respective parts of the spray gun shall be
interchangeable without requiring modification of the part or its mating components.
All parts subject to possible future replacement shall be assigned a manufacturer's
part number and shall be identified in the repair parts manual. All replacement
parts shall provide the same or better form, fit, function, and performance as the
parts provided or initially installed in the end item.
3.4 Material.  All parts of the spray gun shall be fabricated from new materials.
In no event shall such processes as welding, peening, or filling with cold solders
or metallic pastes be used for reclaiming any parts of the spray gun.  All spray gun
parts, except the gun body, in contact with the sprayable materials (see 3.7.1)
shall be fabricated of bronze, brass, or stainless steel.
3.4.1  Dissimilar materials.  Contact between dissimilar metals shall be avoided
wherever possible on the spray gun and all accessory and ancillary equipment.  When
such contact cannot be avoided, suitable protection against corrosion shall be
applied in accordance with MIL-STD-899.
3.4.2  Threaded aluminum interfacing.  Threaded aluminum/aluminum alloy parts or
components of the spray gun shall not be screwed, fastened, or affixed to the
male/female threaded aluminum parts of components.  Oxidation and corrosion of
mating (male/female) threads and fasteners provides for physical bonding Of the
aluminum alloy materials, which interferes with and prevents, disassembly and
reassembly of the spray gun without damage and degradation.
3.5 Threads.  The design, manufacture and configuration of threads shall conform
to FED-STD-H28 and the applicable detailed standards referenced therein.
3.6 Gaskets, O-rings, bushings, seals. The spray gun shall include
gaskets/O-rings/bushings/or other seals herein referred to as "gaskets" to assure
that there are no internal or external air, paint, or mixture leakages. All
gaskets, O-rings, seals, and bushings contained in or provided with the spray gun
shall be composed of materials which will not undergo mechanical or chemical
degradation after repeated and prolonged exposure to coatings, enamels, lacquers,
paints, thinners, and solvents.  Non-mechanical seals, such as glues, epoxies and
anaerobic shall be prohibited for use as sealants in the spray gun.
3.7  Performance and product characteristics.  The spray gun shall be complete so
that the spray gun can be used for any operation specified herein.
3.7.1  Sprayable material.  The spray gun shall be capable of spraying liquid
materials such as enamels, lacquers, primers, shellacs, varnishes, polyurethanes,
stains, paints, and the two part aliphatic polyurethane coatings, conforming to
MIL-P-52192, MIL-P-23377, MIL-C-46168, and MIL-T-81772, which have been thinned to a
viscosity of 25 to 30 seconds using a Number 4 Ford cup at +77 degrees Fahrenheit
(F) plus/minus 5 degrees F.  The spray gun shall satisfactorily spray the materials
on metal surfaces, placed at any orientation to the operator, including overhead.

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