Page 117 - 4300 Catalog Cover.pdf

E3 Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
4300 Catalog Intru-Lok® Flareless Bite Type Fittings
Dimensions and pressures for reference only, subject to change.
Introduction
The Intru-Lok bite type fitting was developed by Parker Hannifin
and introduced to the U.S. market in the late 1950’s. This fitting
addresses those applications that require a bite by the ferrule
in brass, copper, aluminum and plastic tubing systems. The
Intru-Lok fitting is a flareless fitting that consists of a body, a
one-piece precision-machined ferrule, and a nut. On assembly,
the ferrule “bites” into the outer surface of the tube with sufficient
strength to hold the tube against pressure.The ferrule also forms
a pressure seal against the fitting body.
Intru-Lok fittings allow the fitting assembler to visually inspect
the bite quality, thus significantly minimizing the risk of improper
assembly and related service problems.
Intru-Lok fittings are routinely used in markets, such as:
Machine tools, chemical, oil refineries, paper making, thermo-
plastics processing, air and lube lines, pilot lines, panel boards,
etc.
Design and Construction
The three components of Intru-Lok fittings are designed and
manufactured to produce a reliable, leak free joint upon as-
sembly.
The Intru-Lok Body – Intru-Lok fittings’ bodies are available in
over fifteen configurations. The shaped products (i.e., elbows,
tees, and crosses) are hot forged, then machined to the strin-
gent Intru-Lok fitting specifications. Straight products are made
from cold drawn bar stock. The cold drawing operation ensures
consistently tight dimensional tolerances, aswell as significantly
improved strength.
The Intru-Lok Ferrule – Intru-Lok fitting ferrules are precision
machined with all dimensions and surfaces, particularly the
critical bite edge, monitored on an ongoing basis.
The Intru-Lok Nuts – Intru-Lok fitting nuts are machined from
cold drawn bar stock. The cold drawing operation provides a
more tightly packedgrain structure, thus improving thematerial’s
strength. In addition, cold forming significantly improves the
fatigue properties or endurance limits of the nuts.
How Intru-Lok Fittings Work
In assembly, the ferrule is driven forward on the tube by the
nut during pre-set. As the ferrule moves forward it contacts the
tapered seat area of the body, which causes the ferrule to cam
inward into the tube.The leading edge of the ferrule is thus able
to make a clean 360 degree cut into the outside diameter of the
tubing. This cut in the tubing is often referred to as a “Bite”; thus
the term: BiteType Fitting. As the ferrule makes its bite, a small
ridge of tube material is raised up in front of the ferrule.
Assembly and Installation
Please refer to Section T for the assembly and installation in-
structions for Intru-Lok fittings.
Fig. E1 – Intru-Lok Components: Body, Ferrule and Nut
Table E1 – Standard Material Specifications for
Intru-Lok Fittings
Fig. E2 – Assembled Intru-Lok Fitting
Intru-Lok Fittings
Brass
ASTM Type
Forged Bodies B124 CA377
Bar Stock Bodies
B16 CA360
B453 CA345
Bar Stock Tube Nuts B16 CA360
Tube Ferrules B16 CA360
Pressure Rating
The contact of the tube ridge with the ferrule’s front face and bite
edge gives the fitting its ability to retain pressure without leaking
or blowing off. When properly assembled to the recommended
tubing, Intru-Lok fittings will consistently seal up to 1500 psi
working pressure in all sizes.