MIL-DTL-13531J
3.5.3 Flanges. Flanges unless otherwise specified shall be constructed in accordance with
SAE-J518 and as specified herein.
3.5.4 Threaded parts. Screw threads of the form, number per inch and class 2 or as specified on the
applicable drawing or military standard shall be in accordance with ASME B1.1.
3.5.5 Wrench flats. The nominal distance across wrench flats (hexagon or other) shall be in
multiples of .0625 inch (1.588 mm). The tolerance shall not exceed the tolerance across flats for the
semi-finished hexagon nut, nearest the fitting wrench flat size, in accordance with in ASME B18.2.2.
3.5.6 Swivel fittings. Swivel fittings shall swivel freely with applied hand torque when not coupled to
an adapter.
3.5.7 Fitting material. Steel or Stainless steel.
3.5.7.1 Steel hose fittings finish.
3.5.7.1.1 Steel fitting finish (except corrosion resistant steel).
a. Cadmium plating. Cadmium plating shall be in accordance with SAE-AMS-QQ-P-416, type and
class optional. Fluid passages, other openings and internal threads shall not be subject to the
plating thickness requirement and may have bare areas provided they are protected with a light
film of oil.
b. Zinc platings.
(1) Zinc plating shall be in accordance with ASTM B633; type II or III, Fe/Zn 5, or ASTM
B695, type II, class 5. Both zinc platings specified in ASTM B633 type III and
ASTM B695 type II shall meet the same 96-hour salt spray test endurance as
ASTM B633 type II zinc plating.
(2) Zinc plating in shall be in accordance with ASTM B633, type VI, Fe/Zn 5 and shall be
hexavalent chromium free.
(3) Aluminum-nickel in accordance with ASTM F1136, grade 3, NC.
(4) Zinc phosphate. Zinc phosphate shall be in accordance with MIL-DTL-16232, type Z.
(5) Zinc nickel shall be in accordance with SAE-AMS2417, type 1.
c. Chemical film. NAVAIR TCP in accordance with
MIL-DTL-81706, type 2, class A, material form (1 through 6), application method A, B, or C.
Example of a PIN: M817062A3B.
3.5.7.1.2 Corrosion resistant steel. Corrosion resistant steel shall be passivated in accordance with
SAE-AMS2700, type 6 or 7.
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