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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Trade size (nom) (inches)

Dimension (D) (min) (inch)

Diameter bolt (P) (min) (inches)

Diameter inside eye (E) (ref) (inches)

Width between eyes (W) ± nom tolerance (inches)

Length inside (L) ± nom tolerance (inches)

Width bow (B) (min) (inches)

Diameter outside eye (R) (max) (inches)

Weight per

100 shackles (approx) (pounds)

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

3

3-1/2

4

0.18

0.24

0.30

0.36

0.42

0.48

0.59

0.71

0.83

0.95

1.07

1.19

1.31

1.42

1.54

1.66

1.90

2.14

2.38

2.85

3.32

3.8

0.24

0.30

0.36

0.43

0.49

0.61

0.73

0.85

0.98

1.10

1.22

1.34

1.46

1.58

1.71

1.95

2.19

2.44

2.68

3.17

3.66

4.14

0.297

0.406

0.469

0.531

0.594

0.719

0.844

0.969

1.094

1.219

1.344

1.469

1.625

1.75

1.875

2.156

2.406

2.656

2.906

3.406

3.906

4.406

0.375 ±0.125

0.469 ±0.125

0.531 ±0.125

0.656 ±0.125

0.750 ±0.125

0.812 ±0.125

1.062 ±0.125

1.250 ±0.125

1.438 ±0.125

1.688 ±0.125

1.812 ±0.125

2.031 ±0.125

2.250 ±0.188

2.375 ±0.188

2.625 ±0.188

2.875 ±0.188

3.250 ±0.188

3.875 ±0.188

4.125 ±0.250

5.00 ±0.25

5.50 ±0.25

6.50 ±0.25

0.875 ±0.062

1.125 ±0.062

1.250 ±0.062

1.438 ±0.125

1.688 ±0.125

1.875 ±0.125

2.375 ±0.125

2.812 ±0.250

3.312 ±0.250

3.75 ±0.25

4.25 ±0.25

4.688 ±0.250

5.25 ±0.25

5.75 ±0.25

6.25 ±0.25

7.00 ±0.25

7.75 ±0.50

9.25 ±0.50

10.50 ±0.5

13.00 ±0.75

15.00 ±0.75

17.00 ±0.75

0.562

0.75

0.812

0.938

1.062

1.188

1.5

1.75

2

2.312

2.625

2.875

3.25

3.375

4

4.5

5.25

5.5

6.75

7.375

9

10.5

0.625

0.875

1

1.125

1.25

1.375

1.875

2.125

2.375

2.625

2.875

3.25

3.5

3.75

4.125

4.5

5.25

5.75

6.25

6.75

8.5

9.5

5

12

18

30

49

82

158

280

395

560

785

1,120

1,520

1,950

2,410

3,130

4,630

5,650

9,400

14,500

26,500

35,800