Hummer H2. Manual — part 137

GENERAL INFORMATION

English-Metric Conversion Chart

METRIC CONVERSIONS

Metric conversions are making life more difficult for the mechanic. In addition to increasing the number of
tools required, metric-dimensioned nuts and bolts are used alongside English components in many new
vehicles. The mechanic has to decide which tool to use, slowing down the job. The tool problem can be solved
by trial and error, but some metric conversions aren't so simple.

Converting temperature, lengths or volumes requires a calculator and conversion charts, or else a very nimble
mind. Conversion charts are only part of the answer though, because they don't help you "think" metric, or
"visualize" what you are converting. The following examples are intended to help you "see" metric sizes:

LENGTH

Meters are the standard unit of length in the metric system. The smaller units are 10ths (decimeter), 100ths
(centimeter), and 1000ths (millimeter) of a meter. These common examples might help you to visualize the
metric units:

z

A meter is slightly longer than a yard (about 40 inches).

z

An aspirin tablet is about one centimeter across (.4 inches).

z

A millimeter is about the thickness of a dime.

VOLUME

The metric weight system is based on the gram, with the most common unit being the kilogram (1000 grams).
Our comparable units are ounces and pounds:

z

A kilogram is about 2.2 pounds.

z

A kilogram is about 2.2 pounds.

TORQUE

Torque is somewhat complicated. The term describes the amount of effort exerted to turn something. A chosen
unit of weight or force is applied to a lever of standard length. The resulting leverage is called torque. In our
standard system, we use the weight of one pound applied to a lever a foot long, resulting in the unit called a
foot-pound. A smaller unit is the inch-pound (the lever is one inch long). Metric units include the meter
kilogram (lever one meter long with a kilogram of weight applied) and the Newton-meter (lever one meter long
with force of one Newton applied). Some conversions are:

z

A meter kilogram is about 7.2 foot pounds.

z

A foot pound is about 1.4 Newton-meters.

z

A centimeter kilogram (cmkg) is equal to .9 inch pounds.

1998 Chevrolet Pickup C1500

GENERAL INFORMATION English-Metric Conversion Chart

1998 Chevrolet Pickup C1500

GENERAL INFORMATION English-Metric Conversion Chart

PRESSURE

Pressure is another complicated measurement. Pressure is described as a force or weight applied to a given area.
Our common unit is pounds per square inch. Metric units can be expressed in several ways. One is the kilogram
per square centimeter (kg/cm

2

). Another unit of pressure is the Pascal (force of one Newton on an area of one

square meter), which equals about 4 ounces on a square yard. Since this is a very small amount of pressure, we
usually see the kiloPascal, or kPa (1000 Pascals). Another common automotive term for pressure is the bar
(used by German manufacturers), which equals 10 Pascals. Thoroughly confused? Try the examples below:

z

Atmospheric pressure at sea level is about 14.7 psi.

z

Atmospheric pressure at sea level is about 1 bar.

z

Atmospheric pressure at sea level is about 1 kg/cm

2

.

z

One pound per square inch is about 7 kPa.

CONVERSION FACTORS

CONVERSION FORMULA

To Convert

To

Multiply By

LENGTH

Millimeters (mm)

Inches

.03937

Inches

Millimeters

25.4

Meters (M)

Feet

3.28084

Feet

Meters

.3048

Kilometers (Km)

Miles

.62137

AREA

Square Centimeters (cm

2

)

Square Inches

.155

Square Inches

Square Centimeters

6.45159

VOLUME

Cubic Centimeters

Cubic Inches

.06103

Cubic Inches

Cubic Centimeters

16.38703

Liters

Cubic Inches

61.025

Cubic Inches

Liters

.01639

Liters

Quarts

1.05672

Quarts

Liters

.94633

Liters

Pints

2.11344

Pints

Liters

.47317

Liters

Ounces

33.81497

Ounces

Liters

.02957

WEIGHT

Grams

Ounces

.03527

1998 Chevrolet Pickup C1500

GENERAL INFORMATION English-Metric Conversion Chart

EQUIVALENCIES

Ounces

Grams

28.34953

Kilograms

Pounds

2.20462

Pounds

Kilograms

.45359

WORK

Centimeter Kilograms

Inch Pounds

.8676

Pounds/Sq. Inch

Kilograms/Sq. Centimeter

.07031

Bar

Pounds/Sq. Inch

14.504

Pounds/Sq. Inch

Bar

.06895

Atmosphere

Pounds/Sq. Inch

14.696

Pounds/Sq. Inch

Atmosphere

.06805

TEMPERATURE

Centigrade Degrees

Fahrenheit Degrees

(C°x

9

/

5

)+32

Fahrenheit Degrees

Centigrade Degrees

(F°-32)x

5

/

9

Inches

Decimals

mm

1/64

.016

.397

1/32

.031

.794

3/64

.047

1.191

1/16

.063

1.588

5/64

.078

1.984

3/32

.094

2.381

7/64

.109

2.778

1/8

.125

3.175

9/64

.141

3.572

5/32

.156

3.969

11/64

.172

4.366

3/16

.188

4.763

13/64

.203

5.159

7/32

.219

5.556

15/64

.234

5.953

1/4

.250

6.350

17/64

.266

6.747

9/32

.281

7.144

19/64

.297

7.541

5/16

.313

7.938

21/64

.328

8.334

11/32

.344

8.731

1998 Chevrolet Pickup C1500

GENERAL INFORMATION English-Metric Conversion Chart

23/64

.359

9.128

3/8

.375

9.525

25/64

.391

9.992

13/32

.406

10.319

27/64

.422

10.716

7/16

.438

11.113

29/64

.453

11.509

15/32

.469

11.906

31/64

.484

12.303

1/2

.500

12.700

33/64

.516

13.097

17/32

.531

13.494

35/64

.547

13.891

9/16

.563

14.288

37/64

.578

14.684

19/32

.594

15.081

39/64

.609

15.478

5/8

.625

15.875

41/64

.641

16.272

21/32

.656

16.669

43/64

.672

17.066

11/16

.687

17.463

45/64

.703

17.859

23/32

.719

18.256

47/64

.734

18.653

3/4

.750

19.050

49/64

.766

19.447

25/32

.781

19.844

51/64

.797

20.241

13/16

.813

20.638

53/64

.828

21.034

27/32

.844

21.431

55/64

.859

21.828

7/8

.875

22.225

57/64

.891

22.622

29/32

.906

23.019

59/64

.922

23.416

15/16

.938

23.813

61/64

.953

24.209

1998 Chevrolet Pickup C1500

GENERAL INFORMATION English-Metric Conversion Chart