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"

 

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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