Compression Tube Fittings:

General compression tube fittings are Double Ferrule type fittings which provide leak proof torque free seals at the tubing connection. They provide safety and eliminates hazardous leaks of fluids in instrumentation field for process, pressure, hydraulic & other applicable tubing system.

The basic general tube fitting is a 4 piece fitting consisting of the nut, the back ferrule, front ferrule and the body. When installed, it becomes 5 piece connection with the addition of the tubing providing solid leak free joint.

The tube ferrule grasp tightly with no damage to the tube wall. The success of the ferrule lies in the combination of geometry & metallurgy. All the action in the fitting is by an axial movement along the tube instead of rotary motion to form a joint. This axial movements prevents any torque to be transmitted from a fitting to tubing, the making of the joint strengthens the tube futher.

Another advantage of the General Fittings is that the sequential action of the twin ferrule overcomes variations in the wall thickness, hardness and dimensional tolerance of the tubes. This way proper ferrule interaction compensates for most of the variables which lead to failure in fittings.

General Fittings are easy to install and require no special tools in the process. They are reusable several times and can withstand heavy impulse and vibration both in vacuum and pressure systems. Absence of damage to the tube surface prevents fatigue failure.

General Double Ferrule compression tube fittings have the following features:


  • Its self aligning
  • Works on thick and thin wall tubing
  • Resists vibration
  • Fits on a variety of tube materials
  • Have all components made of the same material and hence possess thermal compatibility and corrosion resistance
  • Resistance to temperature cycling
  • Compensates for the variables encountered in tube materials
  • Dimensions and metallurgy


  • Works on vacuum as well as low and high pressures
  • Seals at cryogenic temperatures as well as elevated temperatures rated for the tube
  • Seals consistently over a wide range of temperature cycling
  • Seals repeatedly under make and break conditions
  • Resistant to pressure upto the burst point with the tubing without any leakage


  • Uses geometry rather than torque for uniformity of make-up. It requires only one and quarter turn after snug tight to complete the joint
  • Does not require dismantling and inspection of ferrule swaging at every make-up
  • Does not require any special tools for assembly

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