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ANSI Flange Dimensions
(150# & 300#)

150 lb. STANDARD

Nominal

Pipe Size

Outside

Drill Template

Diameter

Flange

Flange

Thickness

No.

Holes

Diam.

Bolts

Bolt

Circle

1/2

3-1/2

7/16

4

1/2

2-3/8

3/4

3-7/8

1/2

4

1/2

2-3/4

1

4-1/4

9/16

4

1/2

3-1/8

1-1/4

4-5/8

5/8

4

1/2

3-1/2

1-1/2

5

11/16

4

1/2

3-7/8

2

6

3/4

4

5/8

4-3/4

2-1/2

7

7/8

4

5/8

5-1/2

3

7-1/2

15/16

4

5/8

6

3-1/2

8-1/2

15/16

8

5/8

7

4

9

15/16

8

5/8

7-1/2

5

10

15/16

8

3/4

8-1/2

6

11

1

8

3/4

9-1/2

8

13-1/2

1-1/8

8

3/4

11-3/4

10

16

1-3/16

12

7/8

14-1/4

12

19

1-1/4

12

7/8

17

 

300 lb. STANDARD

Nominal

Pipe Size

Outside

Drill Template

Diameter

Flange

Flange

Thickness

No.

Holes

Diam.

Bolts

Bolt

Circle

 1/2

3-3/4

9/16

4

1/2

2-5/8

3/4

4-5/8

5/8

4

5/8

3-1/4

1

4-7/8

11/16

4

5/8

3-1/2

1-1/4

5-1/4

3/4

4

5/8

3-7/8

1-1/2

6-1/8

13/16

4

3/4

4-1/2

2

6-1/2

7/8

8

5/8

5

2-1/2

7-1/2

1

8

3/4

5-7/8

3

8-1/4

1-1/8

8

3/4

6-5/8

3-1/2

9

1-3/16

8

3/4

7-1/4

4

10

1-1/4

8

3/4

7-7/8

5

11

1-3/8

8

3/4

9-1/4

6

12-1/2

1-7/16

12

3/4

10-5/8

8

15

1-5/8

12

7/8

13

10

17-1/2

1-7/8

16

1

15-1/4

12

20-1/2

2

16

1-1/8

17-3/4

 

Just because the flange is a "150 lb" flange, that doesn't mean that it's only rated to 150 psi.  The pressure rating of flanges is dependent on temperature.  See the chart below for the pressure ratings at different temperatures.

Maximum Allowable non-shock Pressure (psig)

Temperature
(oF)

Pressure Class (lb)

150

300

400

600

900

1500

2500

Hydrostatic Test Pressure (psig)

450

1125

1500

2225

3350

5575

9275

-20 to 100

285

740

990

1480

2220

3705

6170

200

260

675

900

1350

2025

3375

5625

300

230

655

875

1315

1970

3280

5470

400

200

635

845

1270

1900

3170

5280

500

170

600

800

1200

1795

2995

4990

600

140

550

730

1095

1640

2735

4560

650

125

535

715

1075

1610

2685

4475

700

110

535

710

1065

1600

2665

4440

750

95

505

670

1010

1510

2520

4200

800

80

410

550

825

1235

2060

3430

850

65

270

355

535

805

1340

2230

900

50

170

230

345

515

860

1430

950

35

105

140

205

310

515

860

1000

20

50

70

105

155

260

430

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Air Compressor Works Inc.