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) (inches)

Length inside (L) (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

2-1/2

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

2.38

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

2.68

3.17

3.66

4.14

0.312

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

2.906

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

4.125 ±0.250

5.00 ±0.25

5.25 ±0.25

5.50 ±0.25

0.750 ±0.062

0.875 ±0.062

1.031 ±0.062

1.250 ±0.125

1.438 ±0.125

1.625 ±0.125

2.000 ±0.125

2.375 ±0.250

2.812 ±0.250

3.188 ±0.250

3.562 ±0.250

3.938 ±0.250

4.438 ±0.250

4.875 ±0.250

5.25 ±0.25

5.75 ±0.25

6.75 ±0.50

8.0 ±0.5

9.00 ±0.75

10.5 ±0.75

12.00 ±0.75

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

6.25

6.75

8.5

9.5

5

11

17

28

42

76

156

262

365

535

727

1,020

1,335

1,850

2,310

2,850

4,110

8,450

12,300

21,800

31,000