MIL-DTL-18295F
3.3.5 Joining links. The design of all joining links shall be as shown on figures 2 and 3. All of the
constituent parts of each joining link shall have tolerances sufficiently small to eliminate slack or
internal displacement of the parts. No sharp corners shall be allowed.
3.3.6 Group I, type 1. Unless otherwise specified (see 6.2), type 1 fleet mooring chain
assemblies shall have chain studs modified as described in 3.3.6.1 and 3.3.6.2.
3.3.6.1 Anode mounting hole. A 0.375-inch (9.5 mm) 16 UNC-2B hole shall be tapped in the
chain stud as specified on figure 1b. Following heat treatment and satisfactory inspection of the
chain, the hole shall be filled with graphite grease conforming with VV-G-671, grade 2. The hole
shall be fitted with a screw as shown on figure 1c to prevent the hole from being filled with
coating material. The screw shall be CRS class 316 of ASTM A 240, 0.375-inch (9.5 mm)
16 UNC-2A thread by 0.50-inch (13 mm) long with a hexagon head. The manufacturer shall
ensure that the threads of the anode mounting hole are not damaged due to overtightening the
screw.
3.3.6.2 Alignment and orientation of anode mounting hole. The stud shall be placed in the link so
that the threaded hole is aligned as specified on figure 1b. The studs shall be oriented so that the
threaded holes face alternately, as shown in figure 1d.
3.3.7 Swivel shackle. The swivel shackle shall conform to the mechanical, physical, and chemical
requirements of tables I, II, III, and in general to the configuration of figures 5, 5a, and 5b. The
swivel shaft and body shall not separate by actions produced during any mooring situation for the
life of the mooring assembly. The swivel body shall rotate on the shaft while suspended while
holding a weight equivalent to one shot of its associated chain size (see 4.6.4). One method of
retaining the shaft into the body shall be by threaded shaft and nut with coarse, UNR, or ACME
threads and double phosphorous bronze washers with locking device. A second method shall be
with double phosphorous bronze washers and a button and peening the shaft. Unless specified in
the contract, the method of retaining the shaft in the body shall be the manufacturer's option of
one of the two methods specified herein. The retainer nut or button may be welded to the shaft
for locking unless otherwise specified (see 6.2).
3.3.7.1 Compatibility. The swivel shall be compatible with the intended component parts of the
mooring chain assembly. The component parts, when attached to the swivel shackle shall be free
to hinge 15 degrees from the long axis of the component parts and swivel shackle at every
90 degrees (0 degrees, 90 degrees, 180 degrees, and 270 degrees) on the circular plane
perpendicular to the long axis. For reference, 0 degrees on the circular plane is parallel to the
shackle main pins.
3.3.7.2 Shackle pins. Unless otherwise specified (see 6.2), the shackle pins shall have a locational
clearance fit as specified in ASME B4.1.
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