MIL-DTL-18001L
3.4 Permissible variation in dimensions.
3.4.1 Length and width of types ZHC, ZHB, ZHS, ZTS, ZPN, ZSS, ZBS, and ZBP anodes. The width and
length of the zinc alloy on Types ZHC, ZHB, ZHS, ZTS, ZPN, ZSS, ZBS, and ZBP anodes shall not vary more than
±⅛ inch (3.75 millimeters), measured at the widest surface of the tapered (for mold release) anode.
3.4.2 Length of type ZRN anodes. A variation of ±0.25 inch (6.35 millimeters) will be permitted based on
nominal lengths of 3 and 6 feet (0.91 and 1.83 meters).
3.4.3 Diameter of types ZEP, ZDM, and ZRN anodes. The diameter or width, whichever is the larger, of Type
ZEP anode shall not vary from the specified dimension by more than ±⅛ inch (3.175 millimeters). The diameter of
the Type ZDM anode shall not vary more than +0.025 or -0.005 inch (+0.635 or -0.127 millimeter) from the
specified diameter. The diameter of the Type ZRN anode shall not vary more than ±1/32 inch (0.79 millimeter) from
the specified diameter.
3.4.4 Thickness. The thickness of Types ZHS, ZHB, ZHC, ZTS, ZPN, ZSS, ZBS, ZEP, and ZBP zinc anodes
shall not vary more than ±⅛ inch (3.175 millimeters). Except for Type ZEP anodes, thickness measurements shall
be taken at random 1 inch (25.4 millimeters) from any edge of the anode by means of a suitable caliper, avoiding
any surface irregularities which would interfere with a representative measurement. Type ZEP anode thickness
measurements shall be taken at random, a distance from the edge of approximately one-half the radius of the anode.
The thickness of Type ZDM anode shall not vary more than ±1/64 inch (0.397 millimeter).
3.4.5 Eccentricity of core in type ZDM anode. The cores of Type ZDM anode shall be positioned axially and
concentrically in the zinc disc. Eccentricity greater than 0.005 inch (0.127 millimeter) shall not be permitted.
3.4.6 Stud hole elongation for type ZSS and ZBS anodes. When specified (see 6.2), Type ZSS and ZBS straps
may be modified as shown on figure 6.
3.5 Marking of anodes.
3.5.1 Marking. The zinc anodes, Types ZHS, ZHB, ZHC, ZSS, ZBS, ZBP, ZMP, ZTS, ZEP, and ZPN shall
have the anode type and the words "DO NOT PAINT" die-stamped or cast on the exposed face of the anodes (see
figures 1 through 22 and 28 through 30). No marking shall be required for Types ZDM, and ZRN zinc anodes. For
Type ZMP, the nominal anode size shall be marked as specified on figure 28.
3.5.1.1 Type ZHB anode markings. One end of each cast-strap of each Type ZHB anode shall be painted red
so that the installing activity can distinguish it from Type ZHS anodes. One coat of red paint shall be applied
between the joggled bevel of the strap and zinc anode. The coating shall be approximately ½ inch (12.7 millimeters)
wide and shall extend across one side of each strap so as to be readily visible when the anode is installed. The foot
of the strap shall not be painted.
3.5.2 Heat identification. Each anode shall be cast or die-stamped with the following: manufacturer s symbol,
unique non-recurring heat number specific to production lot (see 4.2.1), and the capital letter corresponding to the
revision letter of the military specification to which the anode conforms. (For this specification issue, the letter "L"
should be used.)
3.6 Mechanical properties.
3.6.1 Fracture or cracking. When tested in accordance with 4.3.3.3, Type ZRN rods and Type ZPN plates shall
not fracture or show signs of cracking.
3.6.2 Torsional shear strength. When tested in accordance with 4.3.3.4, Type ZRN anodes shall have a
minimum torsional shear strength of 12,000 pounds per square inch (lb/in2) [8,437,000 kilograms per square meter
(kg/m2)].
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