Service Recommendations For Flare-Type Tube Fittings

  1. Check flare and flare seat for defects that might cause leakage.

  2. Align tube with fitting before tightening.

  3. Lubricate connection and hand tighten swivel nut until snug.

  4. To prevent twisting the tube(s), use two wrenches. Place one wrench on the connector body and with the second, tighten the swivel nut to the torque shown in this chart.

Tube Size OD

Nut Size Across Flats

Torque Value 1

Recommended Turns To Tighten (After Finger Tightening)

(in.)

(in.)

N˙m (lb-ft)

(Flats)

(Turns)

3/16

7/16

8 (6)

1

1/6

1/4

9/16

12 (9)

1

1/6

5/16

5/8

16 (12)

1

1/6

3/8

11/16

24 (18)

1

1/6

1/2

7/8

46 (34)

1

1/6

5/8

1

62 (46)

1

1/6

3/4

1-1/4

102 (75)

3/4

1/8

7/8

1-3/8

122 (90)

3/4

1/8

1 The torque values shown are based on lubricated fittings.

AG,OUOMX005,246-19-19981002