CHAIN SIZE
INCH

CHAIN SIZE
MM

WORKING
LOAD LIMIT
(LBS)

WEIGHT
PER FOOT
(LBS)

MATERIAL DIAMETER
INCH

INSIDE LENGTH
INCH

INSIDE
WIDTH
INCH

1/8"

3.17mm

400

0.21

0.16"

0.90"

0.27"

3/16"

5.5mm

800

0.37

0.210"

0.95"

0.39"

1/4"

7mm

1,300

0.59

0.257"

1.02"

0.50"

5/16"

8mm

1,900

1.00

0.330"

1.15"

0.49"

3/8"

10mm

2,650

1.45

0.397"

1.30"

0.60"

1/2"

13mm

4,500

2.64

0.520"

1.56"

0.81"

5/8"

16mm

6,900

3.93

0.630"

1.87"

1.00"

3/4"

20mm

10,600

5.43

0.781"

2.61"

1.02"

7/8"

22mm

12,800

7.64

0.904"

2.57"

1.26"

1"

26mm

17,900

10.10

1.032"

2.90"

1.435"

GRADE 30 WLL CHART

GRADE 30 PROOF COIL SELF COLOR CHAIN (NASM)

National Association of Chain Manufacturers
Welded Steel Chain Specifiations
TABLE I

NOT TO BE USED IN OVERHEAD LIFTING APPLICATIONS

Nominal
Chain Size

Material
Diameter

Working Load Limit
(Max.)

Proof Test**
(Min.)

Minimum
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

3,100

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

13.5

4,500

2,030

9,000

40.0

18,000

80.0

1.79

45.5

0.72

18.2

5/8

16.0

0.630

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

1.020

26.0

17,900

8,140

35,800

159.1

71,600

318.2

3.58

90.9

1.25

31.7

 

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