Service Recommendations For Flared Connections-Straight or Tapered Threads

1. Inspect flare and flare seat. They must be free of dirt or obvious defects.

2. Defects in the tube flare cannot be repaired. Overtightening a defective flared fitting will not stop leaks.

3. Align the tube with the fitting before attempting to start the nut.

4. Lubricate the male threads with hydraulic fluid or petroleum jelly.

5. Index angle fittings and tighten by hand.

6. Tighten fitting or nut to torque value shown on the chart. Do not allow hoses to twist when tightening fittings.

TORQUE CHART a
  Straight Thread b Tapered Thread
Thread Size Nm lb-ft Nm lb-ft
1/8 15 11    
1/4 20 15 45 33
3/8 29 21 69 51
1/2 49 36 93 69
3/4 69 51 176 130
1 157 116 343 253
1-1/2 196 145 539 398
2 255 188 588 434
aTorque tolerance is ±10%.
bWith seat face.

 

NOTE: If female thread is cast iron (control valves, brake valves motors, etc.), torque must be reduced approximately 10%.

T6873AE

Straight Thread

T6873AD

Tapered Thread

04T,90,M171 -19-28JAN92-1/1