4300
Catalog
Assembly / Installation
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
S20
Triple-Lok/Triple-Lok 2
Assembly
For leak-free performance, the Triple-Lok fitting requires the
following steps:
1.
Cutting, deburring and cleaning of the tube
2.
Flaring
3.
Flare inspection
4.
Installation
Caution:
Use only seamless or welded and drawn tube
that is fully annealed for flaring and bending. (See page
T14
for tube/fitting material compatibility information.)
Step 1 has been covered in a previous sectio
n (see page S12)
.
For the recommended minimum and maximum tube wall thick-
ness for Triple-Lok fittings, please refer t
o Table U3 o
n page U3.
Flaring
Several flaring methods, ranging from simple hand flaring to
hydraulic/electric power flaring, are available. Various tools for
flaring are shown on
pages R25
through
R31.
Power flaring
is quicker and produces more accurate and consistent flares
compared to hand flaring. Therefore, it is a preferred method of
flaring. Hand flaring should be limited to places where power
flaring tools are not readily available. The Parflange machines
shown on pag
eR23
also flare tubewith an orbital flaring process
and provide the best flare for stainless steel tube.
Prior to flaring, determine the tube length allowance usingTable
S16.This tube length allowance should be added to the cut tube
length to allow for the “loss” of tube caused by flaring.
Fig. S28 – Nuts and sleeves
assembled before flaring
Fig. S27 – Flaring with Hydra-
Tool
Flare tube end using one of the flaring tools and following its
operating instructions. Fig. S26 shows flaring with Hydra-Tool.
Note:
Be sure to insert a nut and a sleeve in proper se-
quence and orientation before flaring either end of a bent
tube, or second end of a straight tube (see Fig. S27).
Flare Inspection
Inspect flare for dimensions and surface quality. Table S17
shows the proper flare dimensions. The sleeve can also be used
for a quick check of the flare dimensions as shown in Fig. S29.
Stainless seel lubricant is not necessary for assembly unless
parts are washed or heated above 150°. The light wax coating
will evaporate at that point.
Fig. S29 – Comparing flare O.D. with sleeve seat and O.D.
Underflaring
(
see Fig. S30)
reduces contact area causing ex-
cessive nose collapse and leakage; or, in extreme cases, tube
pull out under pressure.
Overflaring
(
see Fig. S30)
causes tube nut thread interference,
either preventing assembly altogether, or giving a false sense
of joint tightness resulting in leakage.
Table S16 —Tube
length allowance
Fig. S26 —Tube length allow-
ance
Triple-Lok Assembly
Nominal Tube
O.D.
A
Inch Metric
1/8
—
0.07
3/16
—
0.08
1/4
6
0.09
5/16
8
0.08
3/8
10
0.08
1/2
12
0.12
5/8 14, 15, 16
0.13
3/4 18, 20
0.15
7/8
22
0.15
1
25
0.15
1 1/4 30, 32
0.20
1 1/2 38
0.18
2
42
0.28
Table S17 — 37° Flare Dimensions
Inch
Tube O.D.
(
in.)
Metric
Tube O.D.
(
mm)
37
° Flare
Diameter ØA
(
in.)
1/4
6
.340/.360
5/16
8
.400/.430
3/8
10
.460/.490
1/2
12
.630/.660
5/8 15 & 16 .760/.790
3/4 18 & 20 .920/.950
1
25 1.170/1.200
1 1/4 30 & 32 1.480/1.510
1 1/2
38 1.700/1.730