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Intru-Lok® Flareless
Bite Type Fittings
The Fitting Authority
Intru-Lok® Flareless Bite Type Fittings
4300 Catalog
BIP
BI2
BTI2
TI2
TIP
Knurled Nut
Nut
Nut and Ferrule
Ferrule
Expander / Insert
Nuts,
Ferrules,
Inserts
E5
E5
E5
E5
E5
T23UI
HBI2
WBI2
TRBI2
FBI2
Insert
Union
Bulkhead Union
Tube End Reducer
NPTF / Intru-Lok
Straights
E5
E6
E6
E6
E6
GBI2
VBI2
EBI2
CBI2
NPTF / Intru-Lok
NPTF / Intru-Lok
Union Elbow
NPTF / Intru-Lok
45° Elbow
90° Elbows
E6
E6
E7
E7
DBI2
JBI2
SBI2
RBI2
OBI2
NPTF / Intru-Lok
Union Tee
NPTF Branch Tee
NPTF Run Tee
NPTF Branch Tee
Tees
E7
E7
E7
E7
E8
MBI2
KBI2
PNI
FNI
NPTF Run Tee
Union Cross
Plug
Cap
Plugs and
Caps
Cross
E8
E8
E8
T22I
Mountie
E8
E2
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
www.parker.com/tfd
E8
Intru-Lok® Flareless Bite Type Fittings
4300 Catalog
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.
Fig. E1 – Intru-Lok Components: Body, Ferrule and Nut
Intru-Lok fittings are routinely used in markets, such as:
Machine tools, chemical, oil refineries, paper making, thermoplastics 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 assembly.
Intru-Lok
Fittings
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 stringent Intru-Lok fitting specifications. Straight products are made
from cold drawn bar stock. The cold drawing operation ensures
consistently tight dimensional tolerances, as well 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.
Brass
ASTM
Type
Forged Bodies
B124
CA377
Bar Stock Bodies
B16
CA360
B453
CA345
Bar Stock Tube Nuts
B16
CA360
Tube Ferrules
B16
CA360
Table E1 – Standard Material Specifications for
Intru-Lok Fittings
The Intru-Lok Nuts – Intru-Lok fitting nuts are machined from
cold drawn bar stock. The cold drawing operation provides a
more tightly packed grain structure, thus improving the material’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° cut into the outside diameter of the tubing.
This cut in the tubing is often referred to as a “Bite”; thus the
term: Bite Type Fitting. As the ferrule makes its bite, a small
ridge of tube material is raised up in front of the ferrule.
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.
Fig. E2 – Assembled Intru-Lok Fitting
E3
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
www.parker.com/tfd
Intru-Lok® Flareless Bite Type Fittings
4300 Catalog
Intru-Lok Features
Feature
Advantage
Benefit
1500 PSI pressure rating
Relatively high pressure rating
Versatility and reliability
Brass construction
Media compatability
Easily used for instrumentation, pilot,
pneumatic, water, and lube lines
Tube Material compatability
For use with copper, aluminum, and
many thermoplastic tube materials
Versatility, especially with instrumentation
applications
Bite type design
Reliability and greater holding power
Bite-type design assures safe leakfree, and vibration resistant connection
compared to compression fittings
Visible bite shows proper
assembly
Risk associated with tube blowout is
virtually eliminated
Reliability
Forged bodies
High impact strength and fatigue
resistance
Long service life
Ferrule and nut do not have to
be removed for assembly
Easy make up procedure
Quick and repeatable installation
procedures
Low assembly torque
Easy installation
Quick installation
Captive Ferrules
Cannot reverse ferrule orientation
Error proof assembly
Additional clearance on
backhole of tube nuts
Allows for tube nut to slide around
bent tube
Tighter and neater tube bends and
installation
Temperature Rating
-65°F to + 400°F temperature rating
Versatility
Knurled nut
Quick installation in areas where
wrench clearances are not available
(tighten by hand)
Tighter and neater tube bends and
installation
No tools required
Table E2 — Features, Advantages and Benefits of Using Intru-Lok Fittings
E4
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
www.parker.com/tfd
Intru-Lok® Flareless Bite Type Fittings
4300 Catalog
BIP*
BI2
L
C
Dia.
Knurled Nut
Intru-Lok
D
L
Nut
Intru-Lok
T6
C
T6
TUBE TUBE
T6
FITTING O.D. TUBE END
PART # (in.) UN/UNF-2B
1/4
7/16-20
4 BIP
3/8
9/16-18
6 BIP
C
DIA. D
L
(in.) (in.) (in.)
0.50 0.26 0.39
0.63 0.38 0.42
STANDARD
FROM
STOCK
-B
•
•
TUBE TUBE
T6
FITTING O.D. TUBE END
PART # (in.) UN/UNF-2B
1/8
5/16-24
2 BI2
3/16
3/8-24
3 BI2
1/4
7/16-20
4 BI2
5/16
1/2-20
5 BI2
3/8
9/16-18
6 BI2
1/2
3/4-16
8 BI2
* For use with thermoplastic tube and TIP expander / insert.
BTI2
L
Nut and Ferrule
Intru-Lok
C
TUBE TUBE C
FITTING O.D. HEX L
PART # (in.) (in.) (in.)
1/8
3/8 0.36
2 BTI2
3/16 7/16 0.34
3 BTI2
1/4
1/2 0.44
4 BTI2
5/16 9/16 0.45
5 BTI2
3/8
5/8 0.45
6 BTI2
1/2
7/8 0.58
8 BTI2
1/16
(Approx.)
TI2
TI2
Captive
Ferrule
Ferrule
Intru-Lok
TUBE TUBE
FITTING O.D. D3
L
PART # (in.) (in.) (in.)
1/8 0.13 0.35
2 TI2
3/16 0.19 0.39
3 TI2
1/4 0.26 0.40
4 TI2
5/16 0.32 0.42
5 TI2
3/8 0.38 0.41
6 TI2
1/2 0.51 0.52
8 TI2
T23UI
L
Expander / Insert
C
HEX
(in.)
3/8
7/16
1/2
9/16
5/8
7/8
D
(in.)
0.17
0.23
0.30
0.36
0.42
0.56
L
(in.)
0.36
0.34
0.44
0.45
0.45
0.58
Specs
STANDARD
FROM
STOCK
-B
•
•
•
•
•
•
Assembly /
Installation
Reference
L
D3
BI2 Nut
STANDARD
FROM
STOCK
-B
•
•
•
•
•
•
TIP*
How to
Order
D
D3
X
STANDARD
FROM
STOCK
-B
•
•
•
•
•
•
L
Insert
X
40° (Typ.)
TUBE TUBE
X
FITTING O.D. D3
L DIA.
PART # (in.) (in.) (in.) (in.)
1/4 0.14 0.45 0.22
4 TIP
3/8 0.22 0.45 0.30
6 TIP
STANDARD
FROM
STOCK
-B
•
•
STANDARD
TUBE
FROM
WALL
TUBE TUBE
X
STOCK
FITTING O.D. THICKNESS L DIA.
(in.)
(in.) (in.)
PART # (in.)
-B
1/4
0.040
0.53 0.23
•
4 T23UI
0.062
0.56 0.29
•
5 T23UI 5/16
3/8
0.062
0.56 0.35
•
6 T23UI
1/2
0.062
0.64 0.47
•
8 T23UI
* For use with thermoplastic tube and BIP nut.
E5
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
www.parker.com/tfd
Intru-Lok® Flareless Bite Type Fittings
4300 Catalog
HBI2
WBI2
L1
Full Dimensions
2
Union
Intru-Lok / Intru-Lok
1
L4
Full Dimensions
I1
.03
Bulkhead Union
Intru-Lok / Intru-Lok
C
How to
Order
W*
1
2
C2
Specs
* W – Pilot drill diameter
TUBE
FITTING
PART #
2 HBI2
3 HBI2
4 HBI2
5 HBI2
6 HBI2
8 HBI2
C
HEX
(in.)
3/8
3/8
7/16
1/2
9/16
3/4
END SIZE
1
2
(in.)
(in.)
1/8
1/8
3/16
3/16
1/4
1/4
5/16
5/16
3/8
3/8
1/2
1/2
TRBI2
L1
(in.)
0.81
0.75
0.84
0.91
1.03
1.19
END
TUBE
SIZE
FITTING
1
2
PART # (in.) (in.)
4-3 TRBI2 3/16 1/4
6-4 TRBI2 1/4 3/8
8-4 TRBI2 1/4 1/2
C
HEX
(in.)
7/16
7/16
9/16
L
C
Q
(in.)
0.56
0.59
0.75
STANDARD
Dynamic
Pressure
(x 1,000 PSI)
-B
1.5
1.5
1.5
2
C1
HEX
(in.)
9/16
9/16
9/16
3/4
3/4
9/16
7/8
1 1/8
7/8
13/16
1 1/8
C1
END SIZE
1
2
(in.) NPTF
1/8 1/8-27
3/16 1/8-27
1/4 1/8-27
1/4 1/4-18
1/4 1/2-14
5/16 1/8-27
5/16 1/4-18
3/8 1/4-18
3/8 1/8-27
3/8 3/8-18
3/8 1/2-14
1/2 3/8-18
1/2 1/4-18
1/2 1/2-14
VBI2
L2
Full Dimensions
END SIZE
1
2
(in.) NPTF
1/8 1/8-27
3/16 1/8-27
1/4 1/8-27
1/4 1/4-18
3/8 1/4-18
3/8 1/8-27
3/8 3/8-18
3/8 1/2-14
1/2 3/8-18
1/2 1/4-18
1/2 1/2-14
TUBE
FITTING
PART #
2 FBI2
3 FBI2
4 FBI2
4-4 FBI2
4-8 FBI2
5 FBI2
5-4 FBI2
6 FBI2
6-2 FBI2
6-6 FBI2
6-8 FBI2
8 FBI2
8-4 FBI2
8-8 FBI2
1
Assembly /
Installation
Reference
L
Full Dimensions
1
2
Male Connector
Intru-Lok / NPTF
1
2
L
(in.)
1.00
1.06
1.30
STANDARD
Dynamic
END
Pressure
SIZE
C2
W
L4 DIA. (x 1,000 PSI)
1
2 HEX I1
(in.) (in.) (in.) (in.) (in.) (in.)
-B
1/4 1/4 9/16 0.88 1.34 0.44
1.5
3/8 3/8 11/16 0.94 1.56 0.56
1.5
1/2 1/2 7/8 1.06 1.75 0.75
1.5
FBI2
Q
Female Connector
Intru-Lok / NPTF
TUBE
FITTING
PART #
2 GBI2
3 GBI2
4 GBI2
4-4 GBI2
6 GBI2
6-2 GBI2
6-6 GBI2
6-8 GBI2
8 GBI2
8-4 GBI2
8-8 GBI2
TUBE
FITTING
PART #
4 WBI2
6 WBI2
8 WBI2
-B
1.5
1.5
1.5
1.5
1.5
1.5
Full Dimensions
Tube End Reducer
Intru-Lok
GBI2
STANDARD
Dynamic
Pressure
(x 1,000 PSI)
C
C
HEX
(in.)
7/16
7/16
7/16
9/16
7/8
1/2
9/16
9/16
9/16
11/16
7/8
3/4
3/4
7/8
L
(in.)
0.86
0.81
0.88
1.08
1.31
0.94
1.14
1.17
0.97
1.19
1.42
1.28
1.27
1.50
STANDARD
Dynamic
Pressure
(x 1,000 PSI)
-B
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
M2
Full Dimensions
1
Y*
45° Male Elbow
Intru-Lok / NPTF
N2
2
*Y – Across
Wrench Flats
STANDARD
Dynamic
Pressure
L2 (x 1,000 PSI)
(in.)
-B
0.78
1.5
0.75
1.5
0.80
1.5
0.97
1.5
0.98
1.5
0.86
1.5
1.08
1.5
1.23
1.5
1.16
1.5
1.16
1.5
1.31
1.5
TUBE
FITTING
PART #
4 VBI2
5 VBI2
6 VBI2
E6
END SIZE
1
2
(in.) NPTF
1/4 1/8-27
5/16 1/8-27
3/8 1/4-18
M2
(in.)
0.50
0.59
0.69
N2
(in.)
0.63
0.63
0.84
Y
(in.)
7/16
9/16
9/16
STANDARD
Dynamic
Pressure
(x 1,000 PSI)
-B
1.5
1.5
1.5
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
www.parker.com/tfd
Intru-Lok® Flareless Bite Type Fittings
4300 Catalog
EBI2
CBI2
M
Typ.
Full Dimensions
Y*
Union Elbow
Intru-Lok / Intru-Lok
M
Full Dimensions
Y*
Male Elbow
Intru-Lok / NPTF
1
N
2
* Y – Across
Wrench Flats
2
* Y – Across
Wrench Flats
END
SIZE
TUBE
FITTING 1
2
PART # (in.) (in.)
4 EBI2 1/4 1/4
6 EBI2 3/8 3/8
8 EBI2 1/2 1/2
DBI2
M
(in.)
0.67
0.72
0.89
Y
(in.)
7/16
9/16
3/4
STANDARD
Dynamic
Pressure
(x 1,000 PSI)
TUBE
FITTING
PART #
2 CBI2
3 CBI2
4 CBI2
4-4 CBI2
5 CBI2
5-4 CBI2
6 CBI2
6-2 CBI2
6-6 CBI2
6-8 CBI2
8 CBI2
8-4 CBI2
8-8 CBI2
-B
1.5
1.5
1.5
Full Dimensions
1
Female Elbow
Intru-Lok / NPTF
END SIZE
1
2
(in.) NPTF
1/8 1/8-27
3/16 1/8-27
1/4 1/8-27
1/4 1/4-18
5/16 1/8-27
5/16 1/4-18
3/8 1/4-18
3/8 1/8-27
3/8 3/8-18
3/8 1/2-14
1/2 3/8-18
1/2 1/4-18
1/2 1/2-14
JBI2
M1
Y1*
M
(in.)
0.66
0.56
0.59
0.72
0.8
0.78
0.72
0.72
0.86
1.00
0.88
0.88
1.09
N
(in.)
0.69
0.67
0.69
0.91
0.74
0.91
0.91
0.81
1.00
1.27
1.00
1.06
1.38
Y
(in.)
5/16
3/8
3/8
9/16
9/16
9/16
9/16
9/16
3/4
5/8
3/4
3/4
7/8
Full Dimensions
END SIZE
1
2
(in.) NPTF
1/8 1/8-27
3/16 1/8-27
1/4 1/8-27
1/4 1/4-18
3/8 1/4-18
3/8 3/8-18
1/2 1/2-14
SBI2
M1
(in.)
0.69
0.66
0.72
0.84
0.92
1.00
1.13
N1
(in.)
0.53
0.53
0.55
0.69
0.69
0.81
0.94
TUBE
FITTING
PART #
2 JBI2
3 JBI2
4 JBI2
5 JBI2
6 JBI2
8 JBI2
Y*
Male Branch Tee
Intru-Lok / Intru-Lok / NPTF
1
M
Typ.
1
2
END SIZE
1
2
3
(in.) (in.) (in.)
1/8 1/8 1/8
3/16 3/16 3/16
1/4 1/4 1/4
5/16 5/16 5/16
3/8 3/8 3/8
1/2 1/2 1/2
RBI2
M
Typ.
2
N
M
(in.)
0.63
0.59
0.59
0.66
0.72
0.88
Y
(in.)
5/16
3/8
3/8
9/16
9/16
3/4
STANDARD
Dynamic
Pressure
(x 1,000 PSI)
END SIZE
1
2
3
(in.) (in.) NPTF
1/8 1/8 1/8-27
1/4 1/4 1/8-27
1/4 1/4 1/4-18
3/8 3/8 1/4-18
M
(in.)
0.63
0.61
0.75
0.72
N
Y
(in.) (in.)
0.69 11/32
0.78 3/8
0.98 3/8
0.91 9/16
-B
1.5
1.5
1.5
1.5
1.5
1.5
Y*
Full Dimensions
Male Run Tee
Intru-Lok / NPTF / Intru-Lok
N
1
2
M Typ.
3
Y* – Across Wrench Flats
3
* Y – Across Wrench Flats
TUBE
FITTING
PART #
2 SBI2
4 SBI2
4-4-4 SBI2
6 SBI2
Reference
3
* Y – Across
Wrench Flats
STANDARD
Dynamic
Pressure
Y1 (x 1,000 PSI)
(in.)
-B
9/16
1.5
9/16
1.5
9/16
1.5
3/4
1.5
3/4
1.5
7/8
1.5
1
1.5
Full Dimensions
Assembly /
Installation
-B
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Y*
Union Tee
Intru-Lok (all three ends)
N1
Specs
STANDARD
Dynamic
Pressure
(x 1,000 PSI)
2
* Y1 – Across
Wrench Flats
TUBE
FITTING
PART #
2 DBI2
3 DBI2
4 DBI2
4-4 DBI2
6 DBI2
6-6 DBI2
8-8 DBI2
How to
Order
1
STANDARD
Dynamic
Pressure
(x 1,000 PSI)
TUBE
FITTING
PART #
2 RBI2
3 RBI2
4 RBI2
4-4-4 RBI2
6 RBI2
-B
1.5
1.5
1.5
1.5
E7
END SIZE
1
2
3
(in.) NPTF (in.)
1/8 1/8-27 1/8
3/16 1/8-27 3/16
1/4 1/8-27 1/4
1/4 1/4-18 1/4
3/8 1/4-18 3/8
M
(in.)
0.63
0.59
0.59
0.75
1.05
N
(in.)
0.69
0.69
0.69
0.98
1.07
Y
(in.)
5/16
3/8
9/16
9/16
9/16
STANDARD
Dynamic
Pressure
(x 1,000 PSI)
-B
1.5
1.5
1.5
1.5
1.5
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
www.parker.com/tfd
Intru-Lok® Flareless Bite Type Fittings
4300 Catalog
OBI2
Full Dimensions
Female Branch Tee
Intru-Lok / NPTF
MBI2
M1
Typ.
Y1*
1
2
N1
Y1*
Full Dimensions
1
Female Run Tee
Intru-Lok / NPTF / Intru-Lok
KBI2
END SIZE
1
2
3
(in.) (in.) NPTF
1/4 1/4 1/8-27
1/4 1/4 1/4-18
3/8 3/8 1/4-18
1/2 1/2 3/8-18
M1
(in.)
0.72
0.86
0.92
1.09
N1
(in.)
0.53
0.69
0.69
0.81
3
* Y1 – Across Wrench Flats
STANDARD
Dynamic
Pressure
Y1 (x 1,000 PSI)
(in.)
-B
9/16
1.5
3/4
1.5
3/4
1.5
7/8
1.5
TUBE
END SIZE
FITTING 1
2
3
PART # (in.) NPTF (in.)
4 MBI2 1/4 1/8-27 1/4
6 MBI2 3/8 1/4-18 3/8
Union Cross
Intru-Lok (all four ends)
M1
(in.)
0.72
0.92
N1
(in.)
0.53
0.69
L
Mountie
T
.25
2
4
* Y – Across
Wrench Flats
TUBE
END SIZE
FITTING 1
M
Y
2
3
4
PART # (in.) (in.) (in.) (in.) (in.) (in.)
4 KBI2 1/4 1/4 1/4 1/4 0.66 7/16
6 KBI2 3/8 3/8 3/8 3/8 0.78 1/2
PNI
Typical application
STANDARD
Dynamic
Pressure
TUBE TUBE
T
FITTING O.D. TUBE END L (x 1,000 PSI)
PART # (in.) UN/UNF-2A (in.)
-B
1/4
1/4-20
0.81
1.5
4 T22I
3/8
1/4-20
0.81
1.5
6 T22I
-B
1.5
1.5
L3
Plug
Intru-Lok
.19
STANDARD
Dynamic
Pressure
(x 1,000 PSI)
Full Dimensions
STANDARD
Dynamic
Pressure
Y1 (x 1,000 PSI)
(in.)
-B
9/16
1.5
3/4
1.5
T22I
Y*
1
C
T
FNI
L5
Cap
Intru-Lok
T6
C
TUBE TUBE
T
FITTING O.D. TUBE END
PART # (in.) UN/UNF-2A
1/4
7/16-20
4 PNI
5/16
1/2-20
5 PNI
3/8
9/16-18
6 PNI
1/2
3/4-16
8 PNI
C
HEX
(in.)
7/16
1/2
9/16
3/4
L3
(in.)
0.50
0.52
0.59
0.67
How to
Order
Specs
Assembly /
Installation
Reference
M
3 Typ.
Full Dimensions
2
M1 Typ.
3
* Y1 – Across Wrench Flats
TUBE
FITTING
PART #
4 OBI2
4-4-4 OBI2
6 OBI2
8 OBI2
N1
STANDARD
Dynamic
Pressure
(x 1,000 PSI)
-B
1.5
1.5
1.5
1.5
TUBE TUBE
T6
FITTING O.D. TUBE END
PART # (in.) UN/UNF-2A
1/8
5/16-24
2 FNI
3/16
3/8-24
3 FNI
1/4
7/16-20
4 FNI
5/16
1/2-20
5 FNI
3/8
9/16-18
6 FNI
1/2
3/4-16
8 FNI
E8
C
HEX
(in.)
3/8
7/16
1/2
9/16
5/8
7/8
L5
(in.)
0.36
0.34
0.44
0.45
0.45
0.58
BI2
Nut
STANDARD
Dynamic
Pressure
(x 1,000 PSI)
-B
1.5
1.5
1.5
1.5
1.5
1.5
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
www.parker.com/tfd
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