Steel O-Ring Face Seal Adapters
Conformance
Materials
- Steel - Carbon steel zinc plated with yellow Dichromate per ASTM B6533-98 (Type II SC-2)
- Stainless - Type 316
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 |
Stainless SS |
Working Pressures
The following table lists the recommended working pressures for steel O-ring Face Seal tube fittings
made in accordance with SAE standard J1943. 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
thread type, use the lower pressure rating of the two threads. CAUTION: O-ring Face Seal fittings are not
designed to provide structural support for other components.
SAE J1453 O-Ring Face Seal Fittings Pressure Ratings
| Dash Size |
Flared Thread(Inches) |
4 To 1 Minimum Burst PSI |
| -4 |
9/16-18 |
6000 |
| -6 |
11/16-16 |
6000 |
| -8 |
13/16-16 |
6000 |
| -10 |
1-14 |
6000 |
| -12 |
1 3/16-12 |
6000 |
| -16 |
1 7/16-12 |
6000 |
| -20 |
1 11/16-12 |
4000 |
| -24 |
2-12 |
4000 |
SAE J1453 O-Ring Face Seal Pressure Ratings For Straight Thread Port Studs
| Dash Size |
Flared Thread(Inches) |
4 To 1 Minimum Burst PSI Straight |
4 To 1 Minimum Burst PSI Adjustable |
| -4 |
9/16-18 |
6000 |
6000 |
| -6 |
11/16-16 |
6000 |
6000 |
| -8 |
13/16-16 |
6000 |
6000 |
| -10 |
1-14 |
6000 |
6000 |
| -12 |
1 3/16-12 |
6000 |
6000 |
| -16 |
1 7/16-12 |
6000 |
5000 |
| -20 |
1 11/16-12 |
4000 |
4000 |
Recommended O-Ring Face Seal Assembly Instructions
- Step 1. Inspect for contamination or damage. Confirm face seal o-ring is properly installed.
- Step 2. Lubricate the threads and the O-ring.
- Step 3. Align mating face seal flange against O-ring and finger tighten face seal flange nut.
- Step 4. Torque flange nut to the value in the following table.
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 torque values provided by Tompkins Industries are to provide benchmarks that we
believe give optimum results for leak free connections. Actual torque values should be based on individual
applications.
| Dash Size |
Face Seal Thread(Inches) |
Torque Foot/Lbs |
| -4 |
9/16-20 |
10-12 |
| -6 |
11/16-16 |
18-20 |
| -8 |
13/16-16 |
32-35 |
| -10 |
1-14 |
45-50 |
| -12 |
1 3/16-12 |
65-70 |
| -16 |
1 7/16-12 |
92-100 |
| -20 |
1 7/8-12 |
125-140 |
| -24 |
2-12 |
150-165 |
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 half way to the 4 o'clock position, but no more than
the 4 o'clock position.
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