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A5 Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
4300 Catalog Seal-Lok™ O-Ring Face Seal Tube Fittings
Dimensions and pressures for reference only, subject to change.
Fig. A2 — Captive O-ring Groove (CORG) Cutaway
Seal-Lok Introduction
The Seal-Lok fitting was developed by theTube Fittings Division
in the early 1980s. This product has proven to be very effective
in eliminating leakage at the higher pressures found in today’s
hydraulic systems. It meets or exceeds the strict requirements
of SAE J1453 and ISO 8434-3.The Seal-Lok fitting is an O-ring
face seal type fitting that consists of a nut, a body, an O-ring and
a sleeve (Fig. A1). As shown in Fig. A3 ,the tube is flanged to
90° (or the tube may be brazed instead to a braze-type sleeve).
When the fitting is assembled, it compresses an O-ring in the
precision machined groove of the fitting body to form a leak
tight seal.
Seal-Lok fittings are suitable for a wide range of tube wall thick-
nesses and are readily adaptable to pipe, inch or metric tubing
and hose. (Please refer to Tables A2 and A3 for min./max. tube
wall thickness for inch and metric tubing, respectively). Seal-
Lok’s leak-free design and rugged construction make it suitable
for a wide range of applications where higher pressures, vibra-
tion and impulse are prevalent. It is popular in markets such as
construction, agriculture, machine tool, utility, paper making,
automotive, etc.
Design and Construction
The Seal-Lok fitting consists of four main components: a body,
a sleeve, an O-ring and a nut. The more popular materials from
which Seal-Lok is manufactured are shown in Table A1.
The Seal-Lok Fitting Body. There are over 60 different body
configurations to choose from for specific applications.The body
face ismanufacturedwithParker’sCORG(captiveO-ringgroove),
which keeps the high durometer O-ring captive during installa-
tion (see Fig. A2). In addition, the Seal-Lok fitting body shapes
are forged for added strength and longer service life, eliminating
thepotential leak paths associatedwithmulti-component brazed
fittings. Straight products are made from cold drawn barstock.
The cold drawing process ensures consistent dimensional toler-
ances, improved strength and better surface finish.
The Seal-Lok Fitting Nut. Seal-Lok tube nuts are either cold
formed or machined from cold drawn bar stock, depending
on the size. The cold forming process increases the material
strength and its fatigue properties, imparting high strength and
longer service life to the nuts.
The Seal-Lok Flange Sleeve. The preferred method of making
a Seal-Lok connection is by using the Parker Parflangemachine
(see section S) to create the 90° flange on the tube end.A flange
sleeve is used to support the flange and the tube. It also provides
the contact shoulder for the nut, a back-up for the 90° tube flange
and support at the tube O.D (see Fig. A3).The
Parflange process provides the following advantages:
• Several times faster than brazing.
• Does not require any special pre- or post-flange cleaning.
• Cleaner and safer than brazing.
• Accommodates the use of plated or unplated sleeve and
tube.
• Eliminates a potential leak path associated with braze
joints.
Fig. A1 — Seal-Lok Fitting Body, O-ring, Sleeve and Nut
Table A1 — Standard Material Specifications for Seal-Lok
Fittings*All stainless steel nuts are coated to prevent galling at as-
sembly.
Note: Other materials can be produced upon request.
Finish: Zinc with yellow chromate (being changed to zinc chromium
6 free) is used on all standard steel products. Stainless steel fittings
are passivated.
Seal-Lok
Fittings
Steel Stainless Steel
ASTM Type ASTM Type
Forged Bodies A576 1214/1215 A182 316
Bar Stock Bodies A108 12L14 A479 316
Cold Formed Nuts A576 C1010 -- --
Machined Nuts* A108 12L14
11L37 A479 316
Braze Sleeves &
Braze Connectors A108 12L14 A276 316L
Flange Sleeves A108 12L14 A479 316