RR-C-271F
TABLE VIII. Mechanical properties.
Size (D) (nominal) (inches) |
Working load limit (pounds) |
Proof load (min) (pounds) |
Breaking load (min) (pounds) |
|||
Grade A |
Grade B |
Grade A |
Grade B |
Grade A |
Grade B |
|
3/16 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 2 2-1/4 2-1/2 2-3/4 3 3-1/2 4 |
650 1,000 1,500 2,000 3,000 4,000 6,500 9,500 13,000 17,000 19,000 24,000 27,000 34,000 40,000 50,000 70,000 80,000 110,000 120,000 170,000 240,000 300,000 |
1,000 1,500 2,500 4,000 5,200 6,600 10,000 14,000 19,000 25,000 30,000 36,000 42,000 60,000 70,000 80,000 100,000 120,000 160,000 180,000 220,000 280,000 350,000 |
1,430 2,200 3,300 4,400 6,600 8,800 14,300 20,900 28,600 37,400 41,800 52,800 59,400 74,800 88,000 110,000 154,000 176,000 242,000 264,000 374,000 528,000 660,000 |
2,200 3,300 5,500 8,800 11,440 14,520 22,000 30,800 41,800 55,000 66,000 79,200 92,400 132,000 154,000 176,000 220,000 264,000 352,000 396,000 484,000 616,000 770,000 |
3,250 5,000 7,500 10,000 15,000 20,000 32,500 47,500 65,000 85,000 95,000 120,000 135,000 170,000 200,000 250,000 350,000 400,000 550,000 600,000 850,000 1,200,000 1,500,000 |
5,000 7,500 12,500 20,000 26,000 33,000 50,000 70,000 95,000 125,000 150,000 180,000 210,000 300,000 350,000 400,000 500,000 600,000 800,000 900,000 1,100,000 1,400,000 1,750,000 |
3.4.3.1.3 Breaking loads. Shackles shall meet the breaking load requirements shown in table VIII (see 4.4.2.2.2).
3.4.3.1.4 Working load limit. The working load limits (WLL) of shackles covered by this specification are shown in table VIII.
3.4.3.1.5 Ductility. Shackles shall be sufficiently ductile so that, when fractured, the fractured member shall show a permanent distortion before breaking. If the pin fractures, it shall show a permanent bend of not less than 20 degrees. If the body fractures, it shall show a permanent mid-shackle set of not less than 15 percent of the original spread between bows.
3.4.3.1.6 Marking. Each shackle body shall be permanently and legibly marked in raised or stamped letters on the side of the shackle bow with the identifying manufacturer's name or trademark, shackle size, and the WLL. As a minimum, all shackle pins and bolts shall be marked with the manufacturer's mark or symbol; in addition, all grade B shackle pins and bolts shall be marked with the raised or stamped letters "HS" on the head. Shackle markings shall be raised or stamped letters or figures of the maximum practical height permitted by the size of the
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