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Steel 37° JIC

Conformance

  • SAE J514
  • MS51500 MS51534

Materials

  • Steel - Carbon steel zinc plated with yellow Dichromate per ASTM B633-98 (Type II SC-2)
  • Stainless - Type 316
  • Brass

Ordering

When ordering, include the appropriate prefix to part number if material or style required is other than steel barstock.

Material/Style Prefix

  • Forged FG
  • Brass BR
  • Stainless SS

Working Pressures

The following table lists the recommended working pressures for steel 37-deg flare hydraulic tube fittings made in accordance with SAE standard J514. Many factors such as impulsing, vibration, mechanical shock and overtightening may affect the integrity of fitting connections. Tompkins and SAE recommend sufficient testing be conducted to assure that performance levels will be safe and satisfactory, especially if installed in systems operating at elevated pressures or in severe conditions. When using fittings with different size or type thread, use the lower pressure pressure rating of the two threads.

CAUTION: 37-deg flared fittings are not designed to provide structural support for other components.

SAE J514 37-Deg Flared Fittings Pressure Ratings

Dash Size Flared Thread Size(Inches) 4 To 1 Minimum Burst PSI
-2 5/16-24 5000
-3 3/8-24 5000
-4 7/16-20 5000
-5 1/2-20 5000
-6 9/16-18 5000
-8 3/4-16 4500
-10 7/8-14 3500
-12 1 1/16-12 3500
-14 1 3/16-12 3000
-16 1 5/16-12 3000
-20 1 5/8-12 2500
-24 1 7/8-12 2000
-32 2 1/2-12 1500

See SAE Straight Thread O-Ring Section for assembly instructions and torque values for installation of 37° Flared Fittings with O-ring straight threads. See NPTF Pipe Section for assembly instructions and proper thread engagement for 37° Flared Fittings with pipe threads.

Recommended 37° Flared Fitting Assembly Instructions:

  • Step 1. Inspect for possible contamination or damage from shipping or handling. Sealing surface should be smooth. Annular tool marks of (100uin) concentric with thread permissible.
  • Step 2. Lubricate the threads and the entire surface of the cone with hydraulic fluid or a light lubricant.
  • Step 3. Align mating components for hand connection and turn flare nut until sealing surfaces make full contact.
  • Step 4. Torque nut to the values shown on the table below. If a wrench pad is provided next to nut, place a second wrench on pad to prevent flare from rotating while being torqued.
  • Step 5. When torquing nut onto a straight flared fitting, it may be necessary to also place a wrench on the flared fitting wrench pad to prevent it from turning during assembly.

Why Wet Torque?

Due to differences in plating types and thicknesses, materials and thread quality of components, the coefficient of friction can vary widely on any given assembly. Lubrication not only produces a more consistent coefficient of friction, it increases clamping force on sealing area with less torque on the threads.

Over-tightening causes threads to yield, deform and therefore lose the ability to maintain an adequate load or clamping force on the seating area. Extended operation and severe conditions cause further yielding which promotes possibility of leaks. Improper installation is the primary cause of leaks in hydraulic connections.

Tompkins firmly recommends the application of the wet-torque method during installation. When you choose not to wet-torque, consistency and quality are compromised for the sake of convenience.

Torque Values

The minimum torque values provided by Tompkins Industries are to provide a benchmark that we believe give optimum results for leak-free connections. Actual torque values should be based on individual application.

Dash Size Flared Thread Size(Inches) Torque Foot/Lbs
-2 5/16-24 6-7
-3 3/8-24 6-9
-4 7/16-20 9-12
-5 1/2-20 14-15
-6 9/16-18 18-20
-8 3/4-16 27-39
-10 7/8-14 36-63
-12 1 1/16-12 65-88
-14 1 3/16-12 75-103
-16 1 5/16-12 85-113
-20 1 5/8-12 115-133
-24 1 7/8-12 125-167
-32 2 1/2-12 190-258

Alternate Assembly Method:

  • Step 1. If torque method not possible, follow steps 1-3 above, then proceed to the steps below.
  • Step 2. Lightly wrench tighten the nut until there is firm resistance.
  • Step 3. Place a wrench on wrench pad next to nut as near the 6 o'clock position as possible.
  • Step 4. Place second wrench on nut as near the 3 o'clock position as possible.
  • Step 5. Turn nut clockwise to no less than the 4 o'clock position and no more than the 6 o'clock position. Required rotation generally decreases as size increases.