RR-C-271 Chains And Attachments, Carbon And Alloy SteelThis specification covers carbon and alloy steel chain of commercial quality together with the attachments most commonly used with this chain.

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RR-C-271F

TABLE XVII. Type V, class 3, eye hoist or eye sling hooks.

Size of chain (nominal) (inch)

Weight each (approx) (pounds)

Working load limit (pounds)

Proof load (min) (pounds)

Breaking load

(min) (pounds)

1/4

3/8

1/2

5/8

3/4

7/8

1-1/4

0.7

1.5

3.0

5.1

8.0

11.0

18.0

33.0

3,600

6,400

11,400

17,800

25,650

34,900

45,600

71,250

7,200

12,800

22,800

35,600

51,300

69,800

91,200

142,500

14,400

25,600

45,600

71,200

102,600

139,600

182,400

285,000

3.4.4.5 Class 6, eye barrel hooks. The eye barrel hooks shall be similar to figure 22, and shall be made with a nominal overall length of 5 inches. The hooks shall be tested to a proof load of

5,500 pounds (see 4.4.2.3.1).

FIGURE 22. Type V, class 6, eye barrel hook.

3.4.5 Type VI, rings. The rings shall be forged or welded from low alloy steel and shall be in accordance with the chemical requirements as shown in table I. The rings shall be heat treated, be similar to figure 23, and shall be accordance with the sizes and weights as shown in

table XVIII.