MIL-DTL-18001L
3.2 Manufacture.
3.2.1 Type ZHS, ZHB, and ZHC, hull slab anodes (see figures 1, 2, and 7 through 10), types ZSS, submarine
slab anode, type ZBS, zinc bar steel strap anode, and ZTS, teardrop anodes (see figures 4 through 7 and figure 22).
Type ZHS, ZHB, ZHC, ZSS, ZBS, and ZTS anodes shall be manufactured by any casting process provided the
anodes meet the other requirements covered by this specification. Open or closed molds may be used. Cores and
straps shall be positioned so that they are embedded ¼ inch -1/16 inch or +⅛ inch (6.35 millimeters -1.58 millimeters
or +3.175 millimeters) as shown on figures 1 through 11 which may be measured from either surface of anode as
applicable, except figure 5, which shall be embedded 3/8 inch -1/16 inch or +⅛ inch (9.525 millimeters -1.58 millimeters
or +3.175 millimeters) and figure 22, which shall be embedded .86 inch ±⅛ inch (21.8 millimeters ±3.3
millimeters). A metallurgical bond shall be obtained between the zinc and the strap when tested as specified in
4.3.1.3 or 4.3.1.4. Type ZHC anodes, designated as shown on figures 9 and 11, are intended for use with rubber
washers for submarine application. Countersinks for rubber washers shall be cast or machined. Anode shall be
manufactured so that the countersink is centered on the core hole. Type ZSS anodes, designated as shown on figures
4 through 6, and type ZBS anode as shown on figure 22, may be mounted by welding or by fasteners. Those
intended to be attached by fasteners shall indicate the requirements for mounting holes in the strap. The mounting
hole shall be counterbored on the structure side of the strap.
3.2.2 Type ZEP, fairwater slab anode, and type ZMP, mooring chain anode (see figures 12 through 20 and
figure 28). The pipe core inserts shall conform to 3.1.2. A sound metallurgical bond shall be obtained between the
core and anode material for at least 30 percent of the total surface of the core in contact with the anode when tested
as specified in 4.3.1.3 or 4.3.1.4. The position of the pipe core insert shall not vary more than ±⅛ inch
3.2.3 Type ZBP, zinc bar anode (see figure 21) and type ZBS, zinc bar steel strap anode. The position of the
pipe core and steel strap insert specified in 3.1.2 shall not vary more than ±¼ inch (6.35 millimeters) from the center
as shown on figure 21 and figure 22. The metallurgical bonding requirements between anode and core specified in
4.3.1 shall apply.
3.2.4 Types ZPN and ZRN anodes (no core) (see figure 23). Type ZPN and ZRN anodes (no core) shall be
manufactured by any process provided the anodes pass the tests demonstrating mechanical properties (see 3.6) and
other requirements covered by this specification.
3.2.5 Type ZDM, zinc segmented disc, machine-formed interlocking core anode (see figures 24 through 27).
Metallic bonding or an interference fit of the core into the anode shall be required so that an axial force applied from
the stud end to remove the core insert is a minimum of 750 pounds (340 kilograms).
3.2.5.1 Core insert. The machine-formed core insert specified in 3.1.4 shall be manufactured in accordance
with details and tolerances shown in FED-STD-H28 and FED-STD-H28/7. This core insert has been designed for
mass production by modern machine methods. The insert consists of an integral piece having a threaded male stud
at one end and a tapped hole at the other end. Provision has been made to achieve self-locking characteristics to
interlocking threaded assemblies of multiple segmented anode discs by interference fit of bottom male threads into a
taper tapped hole. These anodes shall screw together very snugly by hand tightening or by using simple hand tools,
such as pliers or pipe wrenches.
3.3.1 Types ZHS, ZHB, ZHC, ZTS, ZSS, ZBS, ZEP, ZBP, ZDM, ZRN, and ZMP anodes. The specified
anodes shall conform to the dimensions shown on figures 1 to 28, inclusive. Dimensions are in inches unless
otherwise indicated on the figure.
3.3.2 Type ZPN anodes. Type ZPN anodes shall be 48 inches (1219.2 millimeters) in length by 24 inches
(609.6 millimeters) in width. Thickness of Type ZPN anode shall be either 0.5 or 1 inch (12.7 or 25.4 millimeters),
as specified (see 6.2).
3.3.3 Weight. Minimum weight requirements are specified on figures 1 through 30. The total weight of the
specified type of anode received divided by the total number of anodes of that type shall be equal to or greater than
the minimum weight of anode type specified (see 4.2.2).
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