Page 347 - MidlandMetalsCatalog2010baNN

346
O-Ring face seal adapter
Caution: O-ring Face Seal fittings are not de-
signed to provide structural support for other
components.
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 shockandovertighten-
ing may affect the integrity of fitting connections. SAE
recommends sufficient testing be conducted to assure that
performance levelswill 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 lower pressure rating of the two
threads.
Materials
• Steel- SAE 12L14 carbon steel trivalent chrome plated or
clear silver finish.
Conformance
• SAE J1453
O-ring face seal
Assembly Instructions
Alternate Assembly Method
Step1. 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 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 and no more than the 6 o’clock position.
Recommended
Step 1.Lubricate the threads and the entire surface of the face
seal o-ring
Step2. Install o-ring into face seal groove.
Step 3. Place matting 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.
Dash Flared Thread Torque
Size Size Foot/Lbs.
-4 9/16-20 10
-6 11/16-16 20
-8 13/16-16 32
-10 1-14 46
-12 1-3/16-12 65
-16 1-7/16-12 92
-20 1-7/8-12 125
-24 2-12 150
Why wet Torque?
Due to the difference in plating types and thickness,
materials, and thread quality of different components,
the coefficient of friction varies greatly on any given
assembly. Lubrication not only produces a more con-
sistent coefficient of friction, it increases clamping
force on sealing area with less torque on the threads.
Overtightening causes threads toyield, deformand lose
their ability to maintain an adequate load or clamping
forceon the seatingarea. Extendedoperationand severe
conditions cause further yieldingwhich results in leaks.
Overtightening is the single greatest cause for leaks
in metal to metal seat hydraulic connections. It is our
firm position, that to not wet torque, is to compromise
consistency and quality for convenience.
Dash Flared 4 TO 1 Minimum
Size Thread Size 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 fittings pressure rat-
ings
Dash Flared 4 TO 1 Minimum Burst
Size Thread Size Straight Adjustble
-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
-24 2-12 4000 3000
SAE J1453 O-ring face seal pressure ratings for
Straight Thread Port
Torque Values: The torque values provided are to
provide benchmarks that we believe give optimum
results for leak free connections. Actual torque val-
H
YDRAULIC
O-RING FACE SEAL ADAPTERS HYDRAULIC ADAPTERS