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Calibration Weight Tolerances Explained

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What is Weight Tolerance

By raw definition, weight tolerance is the difference between the maximum and minimum values of a given nominal value. For applications in metrology, weight tolerance tells you how much deviation is allowed in the mass of your weight, while still being considered an accurate representation of that mass.

How to Determine Weight Tolerance

Weight tolerance is determined by the governing bodies that oversee national and international weighing standards. The three primary organizations are: ASTM International (Formerly the American Society for Testing and Materials), OIML (International Organization of Legal Metrology), and NIST (National Institute of Standards and Technology).

Each of these organizations have defined Calibration Weight Classes, which group weights based on how accurate they truly are to their nominal value.

High precision classes like ASTM Class 1 and OIML Class E1 will have very low tolerances, meaning the weight is as close to its true value as possible. Low precision classes like ASTM Class 6, OIML Class M2, or NIST Class F, will have a higher tolerance, meaning your weight is close to its reported mass, but may deviate a little more than a high precision class.

For example, let’s look at a 1 gram weight.

Class

Weight Tolerance

“In-Tolerance” Range

ASTM Class 1 (1 g weight)

0.034 mg

0.999966 g – 1.000034 g

ASTM Class 6 (1 g weight)

2.0 mg

0.998 g – 1.002 g

 

As we can see, the ASTM Class 1 weight tolerance is much more precise compared the Class 6. The tolerance range is much more narrow, indicating that the true mass of the Class 1 weight is much closer to a true gram than a Class 6.

The type of calibration weight class you should be using is determined by the class of your scale. For a full breakdown of scale classes, please refer to NIST Handbook 44 (Section 2) or OIML Handbook R76-1, (Section 3.2). You can also read our guide, What are Calibration Weight Classes, to learn more about scale/balance classes and calibration weight classes.

Scale Class vs. Calibration Weight Class Comparison Reference

Knowing your weight tolerance is an essential part of any weight calibration process. If your weight is not in tolerance, you run the risk of affecting your businesses’ processes, and worse, running afoul of federal compliance regulations which may govern your industry. That’s why it’s essential to keep your calibration weights in tolerance.

Weight Tolerance Chart Quick Reference

Weight Tolerance Chart

ASTM E617

Nominal Value

000

00

0

1

2

3

4

5

6

7

2000 kg

 

 

 

 

10 g

20 g

40 g

100 g

200 g

300 g

1000 kg

 

 

 

 

5

10

20

50

100

150

500 kg

 

 

 

 

2.5

5

10

25

50

75

300 kg

 

 

 

 

1.5

3

6

15

30

45

200 kg

 

 

 

 

1

2

4

10

20

30

100 kg

 

 

 

 

500 mg

1

2

5

10

15

50 kg

13 mg

25 mg

63 mg

125 mg

250

500 mg

1

2.5

5

7.5

30 kg

7.5

15

38

75

150

300

600 mg

1.5

3

4.5

25 kg

6.25

12.5

31

62

125

250

500

1.2

2.5

4.5

20 kg

5

10

25

50

100

200

400

1

2

3.8

10 kg

2.5

5

13

25

50

100

200

500 mg

1

2.2

5 kg

1.3

2.5

6

12

25

50

100

250

500 mg

1.4

3 kg

0.75

1.5

3.8

7.5

15

30

60

150

300

1

2 kg

0.5

1

2.5

5

10

20

40

100

200

750 mg

1 kg

0.25

0.5

1.3

2.5

5

10

20

50

100

550

500 g

0.13

0.25

0.6

1.2

2.5

5

10

30

50

300

300 g

0.075

0.15

0.38

0.75

1.5

3

6

20

30

210

200 g

0.05

0.1

0.25

0.5

1

2

4

15

20

160

100 g

0.025

0.05

.13

0.25

0.5

1

2

9

10

100

50 g

0.015

0.03

0.06

0.12

0.25

0.6

1.2

5.6

7

62

30 g

0.014

0.026

0.037

0.074

0.15

0.45

0.9

4

5

44

20 g

0.013

0.025

0.037

0.074

0.1

0.36

0.7

3

3

33

10 g

0.01

0.02

0.025

0.050

0.074

0.25

0.5

2

2

21

5 g

0.005

0.01

0.017

0.034

0.054

0.18

0.36

1.3

2

13

3 g

0.005

0.01

0.017

0.034

0.054

0.15

0.3

0.95

2

9.4

2 g

0.005

0.01

0.017

0.034

0.054

0.13

0.26

0.75

2

7

1 g

0.005

0.01

0.017

0.034

0.054

0.1

0.2

0.5

2

4.5

500 mg

0.002

0.003

0.005

0.01

0.025

0.08

0.16

0.38

1

3

300 mg

0.002

0.003

0.005

0.01

0.025

0.07

0.14

0.3

1

2.2

200 mg

0.002

0.003

0.005

0.01

0.025

0.06

0.12

0.26

1

1.8

100 mg

0.002

0.003

0.005

0.01

0.025

0.05

0.1

0.2

1

1.2

50 mg

0.002

0.003

0.005

0.01

0.014

0.042

0.085

0.16

0.5

0.88

30 mg

0.002

0.003

0.005

0.01

0.014

0.038

0.075

0.15

0.5

0.68

20 mg

0.002

0.003

0.005

0.01

0.014

0.035

0.07

0.12

0.5

0.56

10 mg

0.002

0.003

0.005

0.01

0.014

0.03

0.06

0.1

0.5

0.4

5 mg

0.002

0.003

0.005

0.01

0.014

0.028

0.055

0.08

0.2

 

3 mg

0.002

0.003

0.005

0.01

0.014

0.026

0.052

0.07

0.2

 

2 mg

0.002

0.003

0.005

0.01

0.014

0.025

0.05

0.06

0.2

 

1 mg

0.002

0.003

0.005

0.01

0.014

0.025

0.05

0.05

0.1

 

0.5 mg

0.002

0.003

0.005

0.01

0.014

 

 

 

 

 

0.2 mg

0.002

0.003

0.005

0.01

0.014

 

 

 

 

 

0.1 mg

0.002

0.003

0.005

0.01

 

 

 

 

 

 

0.05 mg

0.002

0.003

0.005

0.01

 

 

 

 

 

 

 

Weight Tolerance Chart

NIST Handbooks**

Nominal Value

105-1 F

44 Accept

44 Maint

2000 kg

200 g

 

 

1000 kg

100

 

 

500 kg

50

 

 

300 kg

30

 

 

200 kg

20

 

 

100 kg

10

 

 

50 kg

5

 

 

30 kg

3

 

 

25 kg

2.5

 

 

20 kg

2

750 mg

1500 mg

10 kg

1

500

1000

5 kg

0.5

400

800

3 kg

0.3

250

500

2 kg

0.2

200

400

1 kg

0.1

120

250

500 g

70 mg

88

175

300 g

60

75

150

200 g

40

50

100

100 g

20

35

70

50 g

10

20

40

30 g

6

15

30

20 g

4

10

20

10 g

2

8

12

5 g

1.5

5

10

3 g

1.3

4

8

2 g

1.1

3

6

1 g

0.9

2

4

500 mg

0.72

1.5

3

300 mg

0.61

1

2

200 mg

0.54

0.8

1.5

100 mg

0.43

0.5

1

50 mg

0.35

0.4

0.8

30 mg

0.3

0.3

0.6

20 mg

0.26

0.2

0.4

10 mg

0.21

0.15

0.3

5 mg

0.17

0.05

0.1

3 mg

0.14

.05

0.1

2 mg

0.12

0.05

0.1

1 mg

0.1

0.05

0.1

*NIST 105-1 Class F tolerances are rounded to two significant figures

 

Weight Tolerance Chart

OIML R-111

Nominal Value

Class

E0*

E1

E2

F1

F2

M1

M2

M3

2000 kg

 

 

 

10 g

30 g

100 g

300 g

1000 g

1000 kg

 

 

1.6 g

5

16

50

160

500

500 kg

 

 

0.8

2.5

8

25

80

250

300 kg

 

 

 

 

 

 

 

 

200 kg

 

 

0.3

1

3

10

30

100

100 kg

 

 

160 mg

0.5

1.6

5

16

50

50 kg

12.5 mg

25 mg

80

250 mg

800 mg

2.5

8

25

30 kg

 

 

 

 

 

 

 

 

25 kg

 

 

 

 

 

 

 

 

20 kg

5

10

30

100

300

1

3

10

10 kg

2.5

5

16

50

160

500 mg

1.6

5

5 kg

1.3

2.5

8

25

80

250

800 mg

2.5

3 kg

 

 

 

 

 

 

 

 

2 kg

0.5

1

3.0

10

30

100

300

1

1 kg

0.25

0.5

1.6

5.0

16

50

160

500 mg

500 g

0.13

0.25

0.8

2.5

8

25

80

250

300 g

 

 

 

 

 

 

 

 

200 g

0.05

0.1

0.3

1

3

10

30

100

100 g

0.025

0.05

0.16

0.5

1.6

5

16

50

50 g

0.015

0.03

0.1

0.3

1

3

10

30

30 g

 

 

 

 

 

 

 

 

20 g

0.013

0.025

0.06

0.2

0.6

2

6

20

10 g

0.01

0.02

0.06

0.2

0.6

2

6

20

5 g

0.008

0.016

0.05

0.16

0.5

1.6

5

16

3 g

 

 

 

 

 

 

 

 

2 g

0.006

0.012

0.04

0.12

0.4

1.2

4

12

1 g

0.005

0.010

0.03

0.1

0.3

1

3

10

500 mg

0.004

0.008

0.025

0.08

0.25

0.8

2.5

 

300 mg

 

 

 

 

 

 

 

 

200 mg

0.003

0.006

0.02

0.06

0.2

0.6

2

 

100 mg

0.003

0.005

0.016

0.05

0.16

0.5

1.6

 

50 mg

0.002

0.004

0.012

0.04

0.12

0.4

 

 

30 mg

 

 

 

 

 

 

 

 

20 mg

0.002

0.003

0.01

0.03

0.1

0.3

 

 

10 mg

0.002

0.003

0.008

0.025

0.08

0.25

 

 

5 mg

0.002

0.003

0.006

0.02

0.06

0.2

 

 

3 mg

 

 

 

 

 

 

 

 

2 mg

0.002

0.003

0.006

0.02

0.06

0.2

 

 

1 mg

0.002

0.003

0.006

 

 

 

 

 

0.5 mg

 

 

 

 

 

 

 

 

* E0 is a theoretical tolerance that is 50% of OIML R 111 Class E1

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