Inch

Metric

1"

2"

3"

4"

5"

6"

8"

9"

10"

12"

Brass

Oilboard

Plastic

Blank

Letter

Letter and Number

Number

Punctuation

Character

Message

Symbol

Technical

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"

19 1/2"

39"

46"

51"

EAR99

Compliant

Not Compliant

Exempt

Compliant

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"

19 1/2"

20"

36"

45 1/2"

46"

70"

75"

1"

2"

2 1/2"

3"

4"

6"

12"

Caution

Fire Lane

Keep Aisle Clear

No Parking

No Smoking

Reserved

Visitors

Accessible

Arrow

Circle

Diamond

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

Hexagon

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

No Parking

No Smoking

Square

Triangle

Curved

Straight

1 to 5

6 to 10

11 to 15

16 to 20

21 to 25

Electrical/Electronic

Flow

Flowchart

Heating and Air Conditioning

House and Plumbing

Pipe Fittings

Sheet Metal Conduit

5"

6"

6 1/2"

7"

11"

24"

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"

20"

24"

36"

0.008"

0.015"

15 1/2"

37"

43"

13

33

39

41

42

44

46

56

60

61

81