Page 304 - MidlandMetalsCatalog2010baNN

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Dash NPSM 4 TO 1 Minimum
Size Thread Size Burst PSI
-2 1/8-27 5000
-4 1/4-18 5000
-6 3/8-18 4000
-8 1/2-14 3500
-12 3/4-14 2250
-16 1-11 1/2 2000
-20 1 1/4-11 1/2 1625
-24 1 1/2-11 1/2 1250
-32 2-11 1/2 1125
SAE J514 NPSM Pressure Ratings
Caution: NPSM pipe swivel unions are not
designed to provide structural support for
other components
Working Pressures
The following table lists the recommended working
pressures for steel NPSM pipe swivel union hydraulic
fittings made in accordance with SAE standard J514.
Many factors such as impulsing, vibration, mechanical
shock and overtightening may affect the integrity of the
fitting and swivel union connection. For these reasons, the
recommended working pressures are actually lower than
the capacity of the fittings. SAE recommends sufficient
testing tobeconducted toassure 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
the lower pressure rating of the two threads.
Torque Values: The torque values provide benchmarks
that we believe give optimum results for leak free connec-
tions. Actual torque values should be based on individual
applications.
Materials
• .Steel - Carbon steel trivalent chrome plating per ASTM
B633-98 (Type II SC-2).
Conformance
• SAE J514
•.30-Degree Chamfers - Most NPSM pipe swivel union
fittings have 30-degree chamfers on NPTF male end of
fittings. This chamfer is optional per SAE J514. If chamfer
ismandatory, consultwithour customer servicedepartment
to verify chamfer exists on items you are requesting.
• Temperature Range: -650F to +4000F
STEEL P IPE SWIVELS NPSM HYDRAULIC ADAPTERS
H
YDRAULIC
Dash NPSM Torque
Size Thread Size Foot/LBS
-2 1/8-27 13
-4 1/4-18 20
-6 3/8-18 25
-8 1/2-14 47
-12 3/4-14 84
-16 1-11 1/2 129
-20 1 1/4-11 1/2 152
-24 1 1/2-11 1/2 152
-32 2-11 1/2 300
Steel pipe swivel
Assembly Instructions
Recommended
Step 1. Inspect male pipe fitting connecting to swivel and con-
firm that it has an internal 30-degree chamfer. Do not install
into union if chamfer is missing.
Step2. Lubricate the threads and the entire chamfered area
of male fitting with hydraulic fluid or other light weight
lubricant.
Step 3. Install lubricated pipe fitting into swivel nut and turn
nut until finger tight.
Step 4. Place wrench on hex of male fitting to prevent male fit-
ting from turning, and torque swivel nut to the values in the
following table.
Caution: When torquing swivel nut on straight swivel
union fittings, it may be necessary to also place a wrench
on the fitting wrench pad to prevent the fitting from back-
ing out of its port while torquing the swivel nut.
Alternate Assembly Method
Step1. If torque method not possible, follow steps 1-3 above, then
proceed to the steps below.
Step 2. Place wrench on hex of male pipe fitting and consider this
wrench in the 12 o’clock position.
Step 3. Lightly wrench tighten the swivel union nut so that the
wrench is as near the 3 o’clock position as possible.
Step 5. Rotate wrench in 3 o ’clock position counterclockwise to
no less than the 1 o’clock position, but no more than the 12
o’clock position.
Why wet Torque?
Due to the difference inplating types and thickness,materials,
and thread quality of different components, the coefficient
of friction varies greatly on any given assembly. Lubrica-
tion not only produces a more consistent coefficient
of friction, it increases clamping force on sealing area
with less torque on the threads. Overtightening causes
threads to yield, deform and lose their ability to main-
tain an adequate load or clamping force on the seating
area. Extended operation and severe conditions cause
further yielding which 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.