€4.11
Parker A-LOK Compression Fittings
A-LOK is a twin-ferrule compression fitting for instrumentation, analyser and process lines. The front ferrule seals against the tube, the back ferrule grips and carries the load. Both belong to the joint and are not swapped individually for other makes. Imperial and metric tube sizes are not interchangeable, even where the numbers sit close together.
FAQ
Frequently Asked Questions
Why two ferrules instead of one?
The two ferrules split the job. The front one seals against tube and fitting body, the back one bites into the tube surface and holds the joint against pull and vibration. A single ferrule would have to do both at once and compromises on each.
Imperial or metric: how do I identify the right size?
By the tube outside diameter, measured rather than estimated. 1/2 inch is 12.7 mm and will not fit a 12 mm fitting. The dimension of each article is given in its technical data, in the same unit as the ordering designation.
Can an A-LOK fitting be reused after it has been opened?
Yes. The ferrules set permanently on the tube at first tightening, after which the joint can be opened and remade repeatedly. Replace it when tube end or ferrule is visibly damaged, or when the joint still leaks after retightening.
More ranges
Parker D1VW Directional Valves
The D1VW series covers direct-operated directional spool valves with solenoid actuation. Selection runs on four axes: spool symbol, coil voltage, seal material and spring return. NBR and FPM differ in media and temperature resistance, not in the mounting pattern, which is why a mix-up only shows up in service.
Industrial Shock Absorbers
An industrial shock absorber decelerates a moving mass over a defined stroke instead of letting it run into a hard stop. It is sized from moving mass, impact velocity, any additional drive force and the number of cycles per hour. The thread size in the designation is the mounting dimension and says nothing about the energy the unit can absorb.
Linear Position Transducers
A linear position transducer reports the position of a piston or carriage to the controller as an electrical signal. Two figures drive the selection: the measuring length, which has to cover the usable stroke, and the output signal the controller expects. Both are encoded in the type designation and repeated in the article technical data.
Flange Pressure Gauges
A flange pressure gauge is fitted into the panel from the front and secured through its front ring. Three figures drive the selection: case diameter, measuring range and connection thread. Choose the range so the normal operating pressure sits around the middle third of the scale, because readings at either end of the scale lose accuracy.
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