Service Recommendations For Flare-Type Tube Fittings
Check flare and flare seat for defects that cause leakage.
Align tube with fitting before tightening.
Lubricate connection and hand tighten swivel nut until snug.
To prevent twisting the tubes, 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
1The torque
values shown are based on lubricated fittings.