Inch

Metric

1"

2"

3"

4"

5"

6"

8"

9"

10"

12"

Brass

Oilboard

Plastic

Vellum

Blank

Letter

Letter and Number

Number

Punctuation

Character

Message

Symbol

Technical

EAR99

Compliant

Not Compliant

Exempt

Compliant

Not Compliant

2"

2 1/4"

3"

3 1/8"

4"

4 1/8"

5"

5 1/4"

6"

7"

7 1/4"

8"

9"

10"

10 7/8"

12"

14"

18"

1 1/4"

1 1/2"

2"

2 1/4"

2 3/4"

3"

3 1/4"

3 3/8"

3 3/4"

4"

4 3/8"

4 1/2"

4 5/8"

4 3/4"

5"

5 1/16"

5 1/4"

5 1/2"

5 7/8"

7"

7 5/8"

8"

8 3/4"

8 13/16"

9"

10"

20"

36"

70"

75"

1"

2"

2 1/2"

3"

4"

6"

12"

Electrical/Electronic

Flow

Flowchart

Heating and Air Conditioning

House and Plumbing

Pipe Fittings

Sheet Metal Conduit

1 to 5

6 to 10

11 to 15

16 to 20

21 to 25

Caution

Fire Lane

Keep Aisle Clear

No Parking

No Smoking

Reserved

Visitors

Arrow

Circle

Diamond

Ellipse (20°, 30°, 40°, and 50° Projections)

Hexagon

Isometric Ellipse (25°, 35°, 45°, and 60° Projections)

Square

Triangle

11"

17"

24"

36"

100

100-N/7

200

3000

3000-1/24

4000

4000-2/30

4300

8220

8220-1/28

8240

8250

8260

5"

7"

7 1/4"

8"

9"

9 3/8"

9 3/4"

9 7/8"

10"

10 1/8"

10 1/2"

11"

11 1/2"

12"

8 1/2"

11"

18"

24"

13

33

39

41

42

44

46

56

60

61

81

3/4" to 12"

1 1/2" to 12"

10" to 52"

Blank

Grid

Plastic

Steel