MIL-DTL-613D
3.5.1 Stainless steel finish. Stainless steel parts shall be passivated as specified in SAE-AMS2700,
type 6 or 7, or ASTM A967/A967M.
3.5.2 Zinc and galvanized coatings. Types I and II grapnels and all attachments shall be zinc coated
in accordance with ASTM A153/A153M except that for nonmagnetic grapnels in accordance with
MIL-C-24707/4 or ASTM A128/A128M grade A type A (rough ground or pickled), or type B (galvanized),
the grapnels shall be painted with asphalt varnish as follows:
3.5.3 Asphalt varnish.
3.5.3.1 Asphalt color. The color shall match color number 17038 of as specified in ASTM D1729.
3.5.3.2 Asphalt flexibility. The varnish shall bend over 1/8 inch mandrel without cracking or flaking.
3.5.3.3 Asphalt adhesion. When tape is pulled from the scored film, no more than 5 percent (rating
48) of the film shall be removed from the panel as specified in ASTM D3359, method B.
3.5.3.4 Asphalt water resistance. The varnish shall withstand immersion in distilled water for 18 hours
at 25o C without blistering, whitening or softening.
3.5.3.5 Asphalt varnish not recommended for sunlight use. The varnish is not recommended for use
in direct sunlight.
3.6 Type III grapnels and attachments. Type III grapnels and attachments, when specified to be
galvanized and type IV grapnels and attachments shall be zinc coated in accordance with ASTM B633,
type Vl, Fe/Zn 25.
3.7 Marking. Each grapnel shall be legibly and permanently marked with the letters "U.S." and either
the name, initials, or brand mark of the manufacturer in accordance with MIL-STD-130. If brand mark is
used, it shall be of such known character that the source of manufacture may be readily determined. In
addition, the actual weight of each type I grapnel shall be impress-stamped on the shank.
3.7.1 Special marking. Special marking shall be required by the contract or order. Type II, light
marine grapnels shall be marked TS120 to indicate minimum tensile strength is 120,000 psi and
YS140 when minimum yield strength is 140,000 psi, see 3.3.1.
3.7.2 Marking nonmagnetic grapnels. Nonmagnetic grapnels shall be permanently marked with the
letters "N-M".
3.7.3 Container marking. In addition to any special marking required by the contract or order,
containers shall be marked in accordance with MIL-STD-129. The item name is "Grapnels, Marine, Trip
Wire, and Crash Truck".
3.8 Workmanship. The workmanship shall be first class in every respect. The grapnels and all
attachments shall be properly shaped and shall be free from fins, cracks, flaws, or other imperfections
that may impair serviceability. Zinc coating shall be adherent and shall cover all surfaces.
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