What is a Compression Tube Fitting?

Traditional compression fittings feature a distinct sleeve, nut, and insert and are offered on the basis of the external diameter of the tube. Because of the simplicity of installation, they are primarily being replaced with “push-in” type fittings. When connecting to a plastic tube or flexible copper tube, a push-in fitting is required. Compression Tube Fittings can be used with PEX, LDPE, MDPE, HDPE, Copper, CTS, CPVC or multi-butylene tubing can be utilized in low-pressure fluid systems with tool-free connectivity.

When to use a compression tube fitting?

A Compression tube fitting, also known as a compression tube, is a type of tube that uses compression to seal. Liquid or gas can flow through the shaft created by the shank and nut. A nipple will connect the side of the tube to another piece of tubing. There are many benefits to using a compression tube fitting such as there is no need for welding and it will not crumble over time which reduces potential leakage points.

What is 254 SMO material?

254 SMO is an austenitic, high-alloy stainless steel, which is designed for usage in seawater and other chloride-bearing hostile environments. The steel is electro-flux remelted, which enables free separation to form a cleaner material. The grade is marked by:

  • Resistance to pitting and crevice corrosion is exceptional.
  • Abrasion resistance is high.
  • High strength against fracture stress corrosion
  • Strength higher than traditional austenitic steels
  • Weldability is excellent.

What are the other properties of 254 SMO material? 

Chemical composition of 254 SMO is Iron (Fe)-  55.69, Chromium (Cr)- 20, Nickel (Ni)- 18, Molybdenum (Mo)- 6.1, Nitrogen (N)- 0.20, Carbon (C)- 0.010.

Due to the exceptionally high work hardness and absence of sulphur content of steel graded 254 SMO, it is very tough to the machine; nevertheless, the use of sharp tools, robust machine components, good feeds, adequate lubrication, and gradual machining results tends to be excellent.

Soldering of grade 254 SMO stainless steel necessitates a composite substance without which low strength is obtained. It is advised to fill metals like AWS A5.14 ERNiCrMo-3 and alloy 625. The electrodes used must match AWS A5.11 ENiCrMo-12, which is utilized in the procedure.

This material should be annealed at 1149-1204°C (2100-2200°F), followed by a water rinse.

Forging, upsetting, and other processes using this material may be carried out at 982 – 1149°C (1800 – 2100°F). Temperatures must not surpass this range since the scalability and the workability of the material would be reduced. It is recommended to undergo post-process annealing to regain maximal corrosion resistance.

What are the types of SMO 254 Compression Tube Fittings?

  • SMO 254 Male Connector 
  • SMO 254 Female Connector 
  • SMO 254 Union
  • SMO 254 Front Ferrule 

What are the Common Uses of SMO 254 compression tube fittings?

  • Food processing 
  • Textile 
  • Oil & Gas
  • Chemical 
  • Water Supply
  • Furniture 
  • Home Appliances
  • Modern Architecture
  • Power Plants
  • Plumbing 
  • Desalination
  • Heat exchangers
  • Desulfurization scrubbers 


Compression tube fittings have many benefits when it comes to being a reliable product. For one, they are even lighter than traditional tube fittings. This makes them more durable and saves on installation costs such as labor. At Dinesh Tube, we offer inspected, marked, and tested 254 SMO Compression Tube Fittings which are carefully packed and delivered safely.

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