GENERAL TORQUE VALUES - Continued
Outside Diameter and Inside Diameter Measurement for Fittings - Continued
Figure 12 shows how to find the sealing surface angle. Use a protractor and measure the sealing surface
parallel to the centerline of the fitting.
Sealing Surface Angle Measurement.
37 Degree Flare and 30 Degree Cone Seat Connectors Service Recommendations
Inspect flare and flare seat. They must be free of dirt or obvious defects.
Defects in tube flare cannot be repaired. Overtightening a defective flared fitting will not stop leaks.
Align tube with fitting before attempting to start nut.
Lubricate male threads with clean oil. Refer to LO 5-3805-294-13
Index angle fittings and tighten by hand.
Tighten fitting or nut to torque value shown on torque table. Do not allow hoses to twist when tightening fittings.
Figure 13. 37 Degree Flare and 30 Degree Cone Seat Connectors.
Straight Fitting or Special Nut Torque Values.
3/8 - 24 UNF
7/16 - 20 UNF
1/2 - 20 UNF
9/16 - 18 UNF