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) (inches)

Diameter pin (P) (min) (inches)

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

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

Length inside (L)

± nominal 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

0.240

0.300

0.365

0.430

0.490

0.610

0.730

0.850

0.980

1.100

1.220

1.340

1.460

1.580

1.710

1.950

2.190

2.440

2.680

3.170

3.660

4.140

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

5.25 ±0.25

5.50 ±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 ±0.25

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 ±0.50

13.00 ±0.75

15.00 ±0.75

14.50 ±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

74

144

216

337

530

700

960

1,260

1,730

2,200

2,780

4,110

5,600

8,350

11,900

21,200

30,500