Nominal Chain Size

Working Load Limit (Max)

Proof Test (Min)

Minimum Breaking Force

in

mm

lbs

kg

lbs

kN

lbs

kN

1/4

7.0

3,150

1,430

6,300

28.0

12,600

56.0

5/16

8.0

4,700

2,130

9,400

41.8

18,800

83.6

3/8

10.0

6,600

2,990

13,200

58.7

26,400

117.4

7/16

11.9

8,750

3,970

17,500

77.8

35,000

155.4

1/2

13.0

11,300

5,130

22,600

100.4

45,200

200.8

5/8

16.0

15,800

7,170

31,600

140.4

63,200

280.8

3/4

20.0

24,700

11,200

49,400

219.6

98,800

493.2