Applying Metrics for Welding

Correct & Incorrect Metric Expressions

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When a millimeter is less than one, a “0” is shown preceding the decimal point.

Correct 0.08 mm

Incorrect .08 mm

Copyright © Texas Education Agency, 2012. All rights reserved.

A decimal point and a zero are not shown when the millimeter dimension is a whole number.

Correct 8 mm

Incorrect 8.0 mm

Copyright © Texas Education Agency, 2012. All rights reserved.

A millimeter dimension with a whole number and a decimal is not shown with a zero following the decimal fraction.

Correct 2.2 mm

Incorrect 2.20 mm

Copyright © Texas Education Agency, 2012. All rights reserved.

A metric dimension is given as a decimal fraction rather than a common fraction.

Correct .25 mm

Incorrect ¼ mm

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Symbols for metric units are shown in lower-case letters in most cases.

Correct 6 mm

Incorrect 6 MM

Incorrect 6 Mm

Incorrect 6 mM

Copyright © Texas Education Agency, 2012. All rights reserved.

Drawings using millimeters will not show the digits separated into groups by commas or spaces.

Correct 1547

Incorrect 1 547

Correct 10289

Incorrect 10,289

Copyright © Texas Education Agency, 2012. All rights reserved.

When listing multiple measurements, a semicolon is used to separate dimensions in a list.

Correct 28 mm; 16 mm; 5.2 mm

Incorrect 28 mm, 16 mm, 5.2 mm

Copyright © Texas Education Agency, 2012. All rights reserved.Copyright © Texas Education Agency, 2012. All rights reserved.

Copyright © Texas Education Agency, 2012. All rights reserved.