Torque Values for 3-Flow, Inc.
Sealing Gasket/Flange Isolation Kits

The following torque values apply to COREGUARD, POINTGUARD AND FLATMATE gaskets only. DO NOT use these values for DEFENDER FS gaskets. There is a separate torque value table for DEFENDER FS gaskets.

3-Flow, Inc. does not take responsibility for any of these torque values. They're theoretical values. These bolt torque values are intended for use as guidelines only and are based on ideal conditions, perfect flanges, flange alignment and new well lubricated bolts/nuts according to the National Boiler Code, installed in accordance with the proper tools and installation guide. Torque values are based on using weld-neck flanges and lubricated stud bolts with a 0.20 friction factor.

ANSI 150# Flanges

Size
(Inches)

Qty. Bolts

Bolt Diameter

Suggested Torque
(Ft. Lbs.)

1

4

0.5

40

1-1/4

4

0.5

40

1-1/2

4

0.5

50

2

4

0.625

80

2-1/2

4

0.625

90

3

4

0.625

110

3-1/2

8

0.625

90

4

8

0.625

100

5

8

0.75

120

6

8

0.75

130

8

8

0.75

130

10

12

0.875

225

12

12

0.875

225

14

12

1.0

320

16

16

1.0

320

18

16

1.125

450

20

20

1.125

450

22

20

1.125

460

24

20

1.25

650

26

24

1.25

650

28

28

1.25

650

30

28

1.25

650

32

28

1.50

1000

34

32

1.50

1000

36

32

1.50

1100

38

32

1.50

1100

40

36

1.50

1100

42

36

1.50

1150

Working Pressure = 285psi
Hydro Test Pressure = 455psi



ANSI 300# Flanges

Size
(Inches)

Qty. Bolts

Bolt Diameter

Suggested Torque
(Ft. Lbs.)

1

4

0.625

80

1-1/4

4

0.625

80

1-1/2

4

0.75

110

2

8

0.625

110

2-1/2

8

0.75

150

3

8

0.75

150

3-1/2

8

0.75

160

4

8

0.75

180

5

8

0.75

190

6

12

0.75

170

8

12

0.875

265

10

16

1.00

320

12

16

1.125

450

14

20

1.125

475

16

20

1.250

650

18

24

1.250

650

20

24

1.250

675

22

24

1.50

1125

24

24

1.50

1200

26

28

1.625

1400

28

28

1.625

1500

30

28

1.750

1700

32

28

1.875

2000

34

28

1.875

2250

36

32

2.00

2300

38

32

2.00

2300

40

32

2.00

2400

42

32

2.00

2400

Working Pressure = 740psi
Hydro Test Pressure = 1135psi



ANSI 400# Flanges

Size
(Inches)

Qty. Bolts

Bolt Diameter

Suggested Torque
(Ft. Lbs.)

1

4

0.625

80

1-1/4

4

0.625

110

1-1/2

4

0.75

110

2

8

0.625

110

2-1/2

8

0.75

150

3

8

0.75

150

3-1/2

8

0.875

180

4

8

0.875

180

5

8

0.875

220

6

12

0.875

220

8

12

1.00

320

10

16

1.125

450

12

16

1.125

650

14

20

1.250

650

16

20

1.375

820

18

24

1.375

820

20

24

1.500

1100

22

24

1.625

1425

24

24

1.750

1775

26

28

1.750

1750

28

28

1.875

2200

30

28

2.00

2300

32

28

2.00

2300

34

28

2.00

2350

36

32

2.00

2350

38

32

2.50

4800

40

32

2.50

5200

42

32

2.50

5500

Working Pressure = 990psi
Hydro Test Pressure = 1510psi



ANSI 600# Flanges

Size
(Inches)

Qty. Bolts

Bolt Diameter

Suggested Torque
(Ft. Lbs.)

1

4

0.625

80

1-1/4

4

0.625

110

1-1/2

4

0.75

110

2

8

0.625

120

2-1/2

8

0.75

150

3

8

0.75

175

3-1/2

8

0.875

200

4

8

0.875

225

5

8

0.875

350

6

12

1.00

325

8

12

1.125

450

10

16

1.250

650

12

20

1.250

675

14

20

1.375

820

16

20

1.500

1125

18

20

1.625

1430

20

24

1.625

1400

22

24

1.750

1775

24

24

1.875

2230

26

28

1.875

2200

28

28

2.00

2300

30

28

2.00

2360

32

28

2.25

3900

34

28

2.25

3950

36

28

2.50

5500

38

28

2.75

7000

40

28

2.75

7200

42

28

2.75

7400

Working Pressure = 1480psi
Hydro Test Pressure = 2245psi



ANSI 900# Flanges

Size
(Inches)

Qty. Bolts

Bolt Diameter

Suggested Torque
(Ft. Lbs.)

1

4

0.625

80

1-1/4

4

0.625

110

1-1/2

4

0.75

110

2

8

0.625

120

2-1/2

8

0.75

150

3

8

0.75

175

3-1/2

8

0.875

200

4

8

0.875

225

5

8

0.875

350

6

12

1.00

325

8

12

1.125

450

10

16

1.250

650

12

20

1.250

675

14

20

1.375

820

16

20

1.500

1125

18

20

1.625

1430

20

24

1.625

1400

22

24

1.750

1775

24

24

1.875

2230

26

28

1.875

2200

28

28

2.00

2300

30

28

2.00

2360

32

28

2.25

3900

34

28

2.25

3950

36

28

2.50

5500

38

28

2.75

7000

40

28

2.75

7200

42

28

2.75

7400

Working Pressure = 2220psi
Hydro Test Pressure = 3355psi



ANSI 1500# Flanges

Size
(Inches)

Qty. Bolts

Bolt Diameter

Suggested Torque
(Ft. Lbs.)

1

4

0.875

110

1-1/4

4

0.875

170

1-1/2

4

1.00

250

2

8

0.875

170

2-1/2

8

1.00

250

3

8

1.125

375

4

8

1.25

650

5

8

1.50

1000

6

12

1.375

825

8

12

1.625

1400

10

12

1.875

2100

12

16

2.00

2300

14

16

2.25

3400

16

16

2.50

4300

18

16

2.75

6200

20

16

3.00

7800

24

16

3.50

13000

Working Pressure = 3705psi
Hydro Test Pressure = 5585psi



ANSI 2500# Flanges

Size
(Inches)

Qty. Bolts

Bolt Diameter

Suggested Torque
(Ft. Lbs.)

1

4

0.875

175

1-1/4

4

1.00

300

1-1/2

4

1.125

400

2

8

1.00

300

2-1/2

8

1.125

400

3

8

1.25

600

4

8

1.50

650

5

8

1.75

1500

6

8

2.00

2300

8

12

2.00

2400

10

12

2.50

4900

12

12

2.75

7900

Working Pressure = 6170psi
Hydro Test Pressure = 9280psi

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3-Flow, Inc.
14998 West 6th Avenue, Suite 600
Golden, CO 80401 U.S.A.
Tel: 720-479-8448
Toll Free: 877-848-3435
Fax: 720-328-8121