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Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
Triple-Lok
®
37° Flare Tube Fittings
4300 Catalog
Materials and Manufacture
Triple-Lok fitting components are manufactured using state-of-
the-art equipment andmanufacturing technologies toassurecon-
struction integrity, optimum strength and toughness, long service
life and the highest quality. At the heart of the Triple-Lok product
line are the finest raw materials and manufacturing technologies
as outlined in
and discussed below.
The Triple-Lok Body:
Triple-Lok fittings are manufactured in
over 65 configurations. Straight bodies are either cold formed or
machined from cold drawn bar stock. The cold forming process
ensuresconsistent dimensional tolerances, improvedmechanical
properties and better surface finishes.ShapedTriple-Lok fittings
are manufactured from a one-piece forged construction. This
forged constructioneliminates thepotential leak pathassociated
with multi-component brazed fittings. Triple-Lok steel forged
shapes also feature an optimum combination of hardness and
toughness for high-pressure capability, minimal nose collapse
(typical of sizes -10 and under) during repeated assembly and
long service life, even under severe operating conditions.
The Triple-Lok Sleeves:
Most steel Triple-Lok flare support
sleeves are cold formed and heat treated for an optimum combi-
nation of strength and ductility.The largest size sleeves, -20, -24,
and -32, are machined from high strength steel. Stainless steel
and brass sleeves are machined from cold drawn barstock.
The Triple-Lok Tube Nuts:
Triple-Lok steel tube nuts are cold
formed, except in sizes –20, -24, and -32, which are machined
from cold drawn barstock. Cold forming increases the material
strength and its fatigue properties, imparting high strength and
longer service life to the nuts. Smaller stainless steel nuts are
also cold formed while all brass tube nuts are manufactured
from cold drawn brass barstock. Most crimp swivel nuts are
also cold formed.
Robust Port Stud:
The adjustable port stud is manufactured
with a longer locknut designed to cover the uppermost threads
completely. Since the backup washer is never exposed to the
upper threads, it cannot be damaged during assembly. Dur-
ing assembly, exposed upper threads, as common with fittings
from other fitting manufacturers, can lead to a deformed backup
washer that can pinch the o-ring and create an o-ring extrusion
gap that has the potential to leak. The longer locknut also pro-
vides a greater grip area for the wrench.
Dual Angle Female Seat:
The seat of the female swivel is
manufactured with a dual angle that accepts both the 37° flare
and 45° flare fitting (only sizes 4, 5, 8 and 10 45° flare fittings).
The dual angle seat also repositions the seal location away
from the tip of the male flare nose, preventing the nose from
biting into the seat and making it more tolerant to minor nose
tip damage.
Table C1 – Standard Material Specifications for
Triple-Lok Fittings
Note:
On request, Triple-Lok fittings can be furnished in materials
other than those shown above.
Finish:
Zinc with yellow chromate (being changed to zinc chromium
6 free) is used on all standard steel products.
How Triple-Lok Fittings Work
Tightening of the nut clamps the tube flare between the body nose
(seat) producing a leak tight connection. This clamping on the
37° taper provides a measure of elasticity to the joint helping it to
resist loosening under vibration. The clamping force results in a
small radial load that tends to deform the fitting nose radially. The
resistance of the nose to elastic deformation provides a constant
preload (similar to a lockwasher) keeping it tight.
The clamping force provided by the nut resists the opposing force
of the fluid under pressure. The joint remains leak tight as long
as the clamping force is higher than the opposing pressure load.
Properly assembled Triple-Lok fittings with appropriate tube will
seal consistently under pressure until tube bursts.
Sealing in Triple-Lok fittings takes place between two smooth
metal surfaces, the fitting nose and inside of the tube flare.
Therefore, the sealing surfaces have to be smooth, free of any
nicks, scratches, spiral toolmarks, splitsorweldbeads.Seamless
or welded and drawn fully annealed tube is recommended for
Triple-Lok fittings for ease in flaring and bending. Certain types
of harder tubes that are not fully annealed may not be suitable
for flaring due to the potential for immediate or long-term crack-
ing of the tube flare. For specific tube type and wall thickness
recommendations, please se
Triple-Lok
Fittings
Steel
Stainless Steel
Brass
ASTM Type ASTM Type ASTM Type
Cold Formed
Bodies
A576
C1010/
C1008
— — — —
Forged Bodies A576
1214/
1215
A182 316 B124 CA377
Bar Stock
Bodies
A108 12L14 A479 316
B16
B453
CA360
CA345
Cold Formed
Nuts
A576
C1010/
C1008
A276 316 B121 CA335
Bar Stock Tube
Nuts
A108 12L14 A479 316
B16
B453
CA360
CA345
Cold Formed
Sleeves
SAE
1020
SAE
1020
— — B111
CA443
CA444
Bar Stock
Sleeves
A108 C1137 A479 316 B371 CA694
Dimensions and pressures for reference only, subject to change.
Assembly and Installation
Please refer t
for the assembly and installation
instructions for Triple-Lok fittings.
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