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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

3.4.6.1.3 Breaking load. The swivels shall withstand, without breaking, breaking loads shown in the respective class tables (see 4.4.2.5.1).

3.4.6.2 Type VII, class 1, chain swivels. The chain swivels shall be similar to figure 24 and shall be in accordance with the dimensions and physical requirements as shown in table XIX.

FIGURE 24. Type VII, class 1, chain swivel. TABLE XIX. Type VII, class 1, chain swivels.

Trade size (nom) (inch)

Length (L) (min) (inch)

Width (W) (nom) (inches)

Eye dia. (D) (min)

Weight per 100 (approx) (pounds)

Working load limit (pounds)

Proof load (min) (pounds)

Breaking load (min) (pounds)

1/4

5/16

3/8

1/2

5/8

3/4

2.25

2.719

3.438

4.25

5.125

5.781

0.75

1.25

1.5

1.75

0.438

0.5

0.75

0.875

1.062

1.25

100

175

287

800

1,200

2,200

3,500

5,200

7,100

1,600

2,400

4,400

7,000

10,400

14,200

4,000

6,000

11,000

17,500

26,000

35,500

3.4.6.3 Class 2, eye and eye swivels. The eye and eye swivels shall be similar to figure 25, and shall be in accordance with the dimensions and physical requirements as shown in table XX.

FIGURE 25. Type VII, class 2, eye and eye swivel.