Nominal Chain Size

Material Diameter

Working Load Limit(Max.)

Proof Test (Min.)

Min. Breaking Force

Inside Length (Max.)

Inside Width (Min.)

in

mm

in

mm

lbs

kg

lbs

kN

lbs

kN

in

mm

in

mm

1/8

4.0

0.156

4.0

400

180

800

3.6

1,600

7.2

0.94

23.9

0.25

6.4

3/16

5.5

0.217

5.5

800

365

1,600

7.2

3,200

14.4

0.98

24.8

0.30

7.7

1/4

7.0

0.276

7.0

1,300

580

2,600

11.6

5,200

23.2

1.24

31.5

0.38

9.8

5/16

8.0

0.331

8.4

1,900

860

3,800

16.9

7,600

33.8

1.29

32.8

0.44

11.2

3/8

10.0

0.394

10.0

2,650

1,200

5,300

23.6

10,600

47.2

1.38

35.0

0.55

14.0

7/16

11.9

0.488

11.9

3,700

1,680

7,400

32.9

14,800

65.8

1.64

41.6

0.65

16.6

1/2

13.0

0.512

13.0

4,500

2,030

9,000

40.0

18,000

80.0

1.79

45.5

0.72

18.2

5/8

16.0

0.63

16.0

6,900

3,130

13,800

61.3

27,600

122.6

2.20

56.0

0.79

20.0

3/4

20.0

0.787

20.0

10,600

4,800

21,200

94.3

42,400

188.6

2.76

70.0

0.98

25.0

7/8

22.0

0.866

22.0

12,800

5,810

25,600

114.1

51,200

228.2

3.03

77.0

1.08

27.5

1

26.0

1.02

26.0

17,900

8,140

35,800

159.1

71,600

318.2

3.58

90.9

1.25

31.7