MIL-DTL-13931J
b.
Black Oxide, Metallic Plated Surfaces (Chromium, Cadmium, Zinc) and Anodic Coatings
Dimensions and tolerances shall apply with coating.
3.3.1.3 Corners and edges. Corners and edges shall be beveled or rounded as indicated on the applicable
drawings. Where designated as "sharp", the edges shall be left as machined, with only deburring
required. When no requirement is specified on the drawing, external edges shall be broken 0.015 inch
maximum and internal edges shall have a 0.010 to a 0.020 inch radius that blends with the adjacent
surfaces without undercutting.
3.3.1.4 Screw threads. The dimensions of all screw threads shall conform to the limits specified in FED-
STD-H28. Terms and symbols shall be in accordance with ASME Y14.6 and Y14.6M. Threads shall be
chamfered or countersunk to eliminate any protrusion or any sharp edge formed by the incomplete thread.
The countersink shall not exceed the major diameter of an internal thread. The chamfer shall not exceed
the minor diameter of an external thread.
3.3.1.5 Blend. When specified on drawings (such as tube forging drawings), a blend shall be defined as
a smooth transition from one specified dimension to another such that the resulting configuration does not
violate any other drawing requirements and shall be within the tolerance zone defined by maximum and
minimum material limits.
3.3.2 Surface texture. The roughness, waviness and lay of surfaces shall comply with the drawings and
ASME B46.1.
3.3.2.1 Knurls. Knurling shall comply with the drawings and ASME B94.6.
3.3.3 Springs. Unless otherwise specified on the applicable drawing, helical compression and
extension springs shall conform to the agency purchase description content in SAE J1122. The springs
shall withstand the required loads, at the specified height or length, and still move freely in the envelope
specified on the drawing.
3.4
Construction.
3.4.1 Protection. All surfaces shall be protected against corrosion and physical injury during
manufacture, assembly and delivery.
3.4.2 Machining.
3.4.2.1 Cannon tubes. Cannon tubes shall be machined so as to minimize distortion caused by residual
stresses.
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