MIL-DTL-18295F
k. Anchor shackle (figure 11).
l. Buoy shackle (figure 12).
3.3 Material and mechanical properties. The material used in the manufacture of mooring chain
assemblies, except for the plate sinker shackle (see 3.3.1), shall meet the mechanical properties of
table I. The finished components shall meet the physical properties of table II. The physical and
mechanical properties of the steel and finished components shall be part of the Certificate of
Compliance (CoC) (see 6.6.1). Components of the same size but fitted to varying nominal size
components shall be tested to the highest nominal size criteria.
TABLE I. Mechanical properties.
Mooring 1/
chain assembly
Swivel shackle
components
pins only
Pear links
Property
Ultimate strength (tensile)
Minimum (pounds per square inch (psi))
93,000 psi
145,000 psi
150,000 psi
Minimum (kilopascal (kPa))
641 212 kPa
999 740 kPa
1 034 214 kPa
Maximum (psi)
115,000 psi
170,000 psi
Minimum (kPa)
792 897 kPa
1 172 109 kPa
Elongation minimum
17 percent
12 percent
9 percent
(gage length = 5 times specimen diameter)
Reduction in area minimum
40 percent
40 percent
22 percent
Brinell hardness
(standard ball: 10 mm and 3 000 kg load)
Chain
192 to 229
321 to 365
300 to 370
Accessories
192 to 235
Impact: average of 3 specimens at not less than
32 degrees foot pound (ft lb) (Newton metre
(N⋅m))
43 ft lb (58 N⋅m) 43 ft lb (58 N⋅m) 30 ft lb (41 N⋅m)
Bar stock
36 ft lb (49 N⋅m)
26 ft lb (35 N⋅m)
Across weld
43 ft lb (58 N⋅m)
15 ft lb (20 N⋅m)
Cast components
1/
Except pear links, plate sinker shackles, swivel shackle pins, split keys, tapered pins, and lead
plugs.
6
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