MIL-DTL-27272C
3.3 Materials. Fittings shall be fabricated from materials specified in MIL-DTL-25579 and on the
applicable specification sheets . Class 1 fittings shall be all CRES. Class 2 fittings shall be a combination
of aluminum and CRES (see 4.6.1.).
3.3.1 Toxic chemicals, hazardous substances, and ozone depleting chemicals (ODCs). The use of
toxic chemicals, hazardous substances, or ODCs shall be avoided, whenever feasible.
3.3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life-cycle cost.
3.4 Finish.
3.4.1 Corrosion-resistant steel fittings. Corrosion resistant parts shall be passivated in accordance with
SAE AMS-QQ-P-35 for the specific material (see 4.6.1).
3.4.2 Aluminum fittings. Aluminum fittings shall be finished in accordance with MIL-A-8625 as
specified on the applicable specification sheet (see 4.6.1).
3.4.3 Brazing. Fittings manufactured by torch brazing in accordance with AWS C3.4, or induction
brazing in accordance with AWS C3.5, or furnace brazing in accordance with AWS C3.6, or aluminum
brazing in accordance with AWS C3.7, or aluminum brazing in accordance with SAE AMS 2672, or fusion
welding for aerospace applications in accordance with SAE AMS-STD-2219 or dip brazing in accordance
with SAE AMS 2673 or mechanical operations in accordance with applicable MS, shall be proof tested in
accordance with 4.6.3. Radiographed parts in accordance with ASTM E1742.
3.5 Design and construction.
3.5.1 Fitting end mateability. Fittings shall mate with fitting ends conforming to MS33786, SAE
AS4395, SAE AS33514, as specified on the applicable specification sheets. Flared fittings shall mate
with SAE AS4395 and flareless fittings shall mate with SAE AS33514 (see MIL-DTL-25579/1 to apply
NAS 1760) and flange fittings shall mate with MS33786 per applicable MS (see 4.6.1).
3.5.2 Hose compatibility. Fittings shall be compatible with hose which conforms to MIL-DTL-27267;
when assembled, assemblies shall conform to MIL-DTL-25579 (see 4.5.1 and 4.6.1).
3.5.3 Threads. Threads shall be as specified on MIL-S-7742 and applicable specification sheet (see
4.6.1).
3.5.4 Lubricant. Class 1 nipple fitting threads shall be lubricated using dry film lubricant conforming to
SAE AS1701 or AS5272 or MIL-PRF-46010. The coating thickness shall be a minimum of .0002 inch and
no greater than .0030 inch, and shall not impede engagement of the applicable parts (see 4.6.1).
3.5.5 Surface roughness. Surface roughness shall be as specified in the applicable specification sheet
(see 4.6.1).
3.6 Performance.
3.6.1 Fitting assembly torque. Fittings shall not leak, fail, deform, gall, or bind when assembled and
torqued to the value specified in table I for class 1 fittings (see 4.6.2.).
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