MIL-DTL-18295F
TABLE II. Physical properties of finished mooring chain assembly components 1/.
Minimum chain weight
Chain diameter
Proof load
Minimum breaking load
per shot
inch (millimetre (mm))
lbs (kilogram (kg))
lbs (kg)
lbs (kg)
1.75 (44)
247,000 (112 037)
352,000 (159 664)
2,590 (1 175)
2.00 (51)
318,000 (144 242)
454,000 (205 931)
3,360 (1 524)
2.25 (57)
396,000 (179 622)
570,000 (258 547)
4,250 (2 278)
2.50 (63)
484,000 (219 538)
692,000 (313 886)
5,270 (2 390)
2.75 (70)
578,000 (262 176)
826,000 (374 667)
6,410 (2 908)
3.00 (76)
679,000 (307 989)
970,000 (442 894)
7,650 (3 493)
3.50 (89)
900,000 (408 233)
1,285,000 (582 866)
10,500 (4 763)
4.00 (102)
1,143,000 (518 456)
1,632,000 (874 621)
13,700 (6 214)
1/
Except plate sinker shackles, split keys, tapered pins, and lead plugs.
3.3.1 Plate sinker shackles. The requirements specified in tables I and II do not apply to plate
sinker shackles and their bolts. Shackle material and fabrication shall be in accordance with figure
7. Surface inspection as required in 4.6.3 and proof and break loads required herein are the only
test requirements for the plate sinker shackle. The following proof and break loads shall apply:
Proof lbs (kg)
Break min. lbs (kg)
Nominal chain size inch (mm)
1.75 to 2 (44 to 51)
60,000 (27 216)
135,000 (61 235)
2.25 to 4 (57 to 102)
120,000 (54 431)
200,000 (90 718)
3.3.2 Weight of each shot. The weight of each shot shall be not less than that specified in
table II.
3.3.3 Lead plug. All chain and anchor joining links, swivel shackles, joining shackles, and anchor
shackle shall include a lead plug for each tapered retaining pin which will be hammered into the
dovetail chamber to securely hold the pin in place. The lead plug shall be sized for the specific
nominal size component. The least diameter of the plug shall be the same as the largest diameter
of the tapered pin. The plug shall mushroom out when hammered to completely fill the dovetail
chamber. The lead plug shall not be inserted by the manufacturer (see figure 5a). Lead plugs
shall be packed separately by size and clearly marked.
3.3.4 Tapered pins and split keys. All joining links, swivel shackles, joining shackles, and the
anchor joining shackle shall have tapered pins for securing the main pin in place. The chamber
which accepts the tapered pin shall be dovetailed at the larger end of the pin hole to retain the lead
plug specified in section 3.3.3. The tapered pin shall fit in the chamber flush with the bottom of
the dovetail section to allow room for the lead plug. Tapered pins and split keys are exempt from
the physical, mechanical, and metallurgical requirements of the link proper. Swivel shackles shall
have two tapered pins securing each main pin. The split keys and tapered pins shall be corrosion-
resistant steel (CRS) conforming to class 316 of ASTM A 240. The fit for tapered pins shall be
interference fit and for split keys shall be locational clearance fit as specified in ASME B4.1 (see
figures 2, 3, 5, 5a, 5b, 10, 11, and 12). Provide extra tapered pins, split keys, and lead plugs
when specified (see 6.2).
7
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