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Parker O-Lok Fittings

Parker O-Lok Fittings   Next >>
Product Description

The Parker O-Lok fitting has been introduced to eliminate leakage in hydraulic systems and allow higher operating pressures (630 bar up to 12mm / 1/2" O.D.)

Parker O-Lok fittings in steel, stainless steel and brass are suitable for a wide range of tube dimensions and wall thicknesses. They are designed for use with metric and inch tubing.

A single Parker O-Lok fitting body can accommodate several different tube diameters just by changing the sleeve or braze-on spud.

Design and Construction

Parker O-Lok fittings can be assembled either by orbital 90° flanging of the tube using the Parker Parflange process or by brazing a spud on the tube end.


Preparing the tube end using the Parker Parflangeâہ¡ process provides the user with the means of easily achieving a leak-free connection. It is ideal for in-house or on site applications.


An alternative solution is to assemble Parker O-lok Fittings using a brazing spud on the tube end. Brazing can be useful for field assembly or when small quantities of tubes are being prepared.


In both cases the tube end plus sleeve or spud acts as a reinforced point to provide higher vibration and impulse resistance. Parker O-Lok fittings consist of Fitting body, Sleeve, O-ring and Nut.

The Parker O-Lok Body

There are over 30 different body shapes to choose from when specifying Parker O-Lok fittings for your application. The body face has a machined groove which contains an O-Ring.

Parker O-Lok shape fittings are manufactured from forgings for greater strength and longer service life.

The Parker O-ring

A 90 degree Durometer Shore Nitrile O-ring is held captive in the groove of the fitting body. Note that Nitrile O-ring can be replaced by other O-ring materials.

Captive Groove Design

The O-ring groove incorporates an overhang to retain the O-ring in position, helping to eliminate O-ring loss or disturbance during tube assembly. This feature is now standardised under SAE J1453 as an alternative groove design.

The Parker O-Lok Sleeve

Mechanical sleeve

During the 90 degree flanging operation, the tube is pressed against the inner surface of the Parflange Sleeve, providing high rigidity when assembles to the fitting. Each Parflange sleeve is manufactured to strict tolerances and marker Parflanhe ensuring you of the highest quality assembly.

Brazed sleeve

Parker also manufacture spuds that can be brazed onto the tube. Reducing spuds allow Down sizing a large tube end to a smaller one.

The Parker O-Lok Nut

Parker O-Lok fitting nuts are cold formed (smaller sizes) or hot forged (larger sizes), depending on size.

Parker O-Lok Finish

Parker P-Lok steel fittings are yellow zinc plated (thickness 8 to 14um). This plating gives a high corrosion resistance (350 hours salt spray test to red rust*).

*Test in accordance with ASTM B117 or NFX 4.1.002.

Soft-Seal Capability

The design of the Parker O-Lok fittings used with the Parflange flanging system gives only one leak path which is sealed by a standard 90º Shore a Nitrile O-ring.


Parker O-Lok fittings can be assembled and disassembled many times. It is recommended that the O-ring is replaced to ensure a perfect assembly.



Product Code : 19      Brand Name :Parker

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