Electrical/Electronic

Flow

Flowchart

Heating and Air Conditioning

House and Plumbing

Pipe Fittings

Sheet Metal Conduit

Inch

Metric

Aluminum

Plastic

Stainless Steel

Wood

Arrow

Circle

Diamond

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

Hexagon

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

Square

Triangle

Character

Symbol

Technical

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"

30"

Flat

Triangle

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"

2 3/4"

3 1/4"

3 3/4"

4"

4 3/8"

4 5/8"

5"

5 1/16"

5 1/4"

5 7/8"

7"

7 5/8"

8 3/4"

8 13/16"

Exempt

EAR99

13

33

39

41

42

44

46

56

60

61

81

Compliant

Not Compliant

Computer flow symbols conform to ANSI X3.5 and ISO 1028

Cross sections for heating and air conditioning

For pipe and plumbing layout: gas, oil, water, and chemical

House plan and plumbing fixtures

Symbols conform to ASA Z32.2.3 and 32.2.4

Symbols for pipe OD, end bell, flange, and fittings

Symbols, contacts, switches, terminals, etc. Conform to ANSI Y32.2 (Set of 3)

Compliant

Not Compliant

1"

2 3/4"

3 1/4"

3 3/4"

4"

4 3/8"

4 5/8"

5"

5 1/16"

5 1/4"

5 7/8"

7"

7 5/8"

8 3/4"

8 13/16"

1 mm

1 mm

6"

10"

12"

30 cm

1/16" to 1 3/8"

1/16" to 1 1/2"

1/16" to 3"

3/32" to 1"

1/4" to 1 1/2"

1 1/4" to 3 1/2"

2 mm to 30 mm

2 mm to 34 mm

2 mm to 48 mm

25 mm to 85 mm

4"

10"

12 cm

25 cm

1"

1 cm

1

1 1/2

3

16

1:500

1:400

1:300

1:250

1:200

1:125

1:100

1:75

1:50

1:25

1:20

10ths

20ths

30ths

40ths

50ths

60ths

Bevel

Square