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C10 Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
Triple-Lok® 2 37° Flare Tube Fittings
4300 Catalog
Triple-Lok 2 Introduction
Parker’s Triple-Lok 2 combines the versatility of stainless steel
Triple-Lok with the added advantage of an elastomeric seal.
Triple-Lok 2 incorporates a replaceable seal in the nose of
the flare, which is positioned so that leak-free connections are
made without compromising the strength of the fitting. Triple-
Lok 2 shape fittings with SAE straight thread adjustable studs
also feature Parker’s new patent-pending design, providing
easier assembly and improved reliability. Triple-Lok 2 can be
used in any industrial application where corrosion resistance
and leak-free connections are essential. Triple-Lok 2 is a direct
interchange for any industrial 37° flare fitting, allowing current
37° flare fitting users to take advantage of Triple-Lok 2 without
changing hoses or tubes.
Design and Construction
The Triple-Lok 2 design incorporates an elastomeric seal in the
nose of the 37° flare.TheO-ring is positioned so that elastomeric
sealing occurs with themating tube regardless of tubewall thick-
ness. It uses an easily produced flare at the tube end to seal
and hold fluid under high pressure. The fitting consists of three
pieces: the body (with O-ring), sleeve and nut (Fig. C4). The
tube end is flared at a 37° angle (74° included angle) and held
between the fitting nose (seat) and the sleeve (support) with the
nut as shown in Fig. C5, providing a very effective elastomeric
seal between the fitting nose and the tube flare.
Materials and Manufacture
Triple-Lok 2 fitting components are manufactured using state-
of-the-art equipment and manufacturing technologies to assure
construction integrity, optimum strength and toughness, long
service life and the highest quality. At the heart of the Triple-Lok
2 product line are the finest raw materials and manufacturing
technologies as outlined in Table C5 and discussed below.
The Triple-Lok 2 Body: Triple-Lok 2 fittings are manufactured
in the most popular stainless steel sizes and configurations.
Straight bodies aremachined fromcolddrawnbar stock.Shaped
Triple-Lok 2 fittings are manufactured from a one-piece forged
construction. This forged construction eliminates the potential
leak path associated with multi-component brazed fittings.
TheTriple-Lok Sleeves: Stainless steel sleeves are machined
from cold drawn barstock.
TheTriple-LokTube Nuts: The tube nuts are either cold formed
ormachined fromcold drawn barstock.The cold forming process
increases thematerial strengthand its fatigueproperties, impart-
ing high strength and longer service life to the nuts.
How Triple-Lok 2 Fittings Work
Tightening of the nut clamps the tube flare between the body
nose and O-ring, producing a leak tight connection. This
Fig. C4 – Triple-Lok 2 Fitting Body, Sleeve and Nut
Sleeve
Fig. C5 – Triple-Lok 2 Design and Features
Tube
Elastomeric
Seal
Table C5 – Standard Material
Specifications for Triple-Lok 2 Fittings
Finish: Stainless steel fittings are passivated.
Triple-Lok 2
Fittings
Stainless Steel
ASTM Type
Forged Bodies A182 316
Bar Stock
Bodies A479 316
Cold Formed
Nuts A276 316
Bar Stock Tube
Nuts A479 316
Bar Stock
Sleeves A479 316