Unions & Nuts

SGE Unions are available in two material types: stainless steel and glass-lined stainless steel (GLT™ lined unions).

  • Stainless steel unions come in a variety of tube sizes and configurations for example: straight through, reducing, tees, crosses and bulkheads.
  • GLT™ unions are inert and mainly used for connecting fused silica tubing of various internal diameters.

All SGE unions are supplied with the appropriate nuts, ferrules and/or sealing rings.

Nuts for SGE Fittings

SGE has taken special consideration of the design of the connections and nuts for fittings. The nuts and fittings are unique in that the fitting is flat faced and the point of the ferrule is towards the nut. This makes a more robust system since the angled portion of the fitting cannot be damaged.

SGE nuts are made in a variety of:
  • Materials - stainless steel, nickel plated brass and brass.
  • Lengths - standard and extended.
  • Tubing size - 1/16", 1/8" and 1/4" and mini - union.
  • Hole sizes - regular or 1.2 mm for capillary columns.
  • Configurations to compliment SGE’s product range - regular, SilTite™ range and SilTite™ FingerTite range.
Union 1
Union 2
Union 3
Union 4
Union 5
Union 6
Union 7
Union 8

Straight Through Unions

Material Characteristics
  • Available in Stainless steel or Glass lined (GLT) Stainless steel.

Connections Suitable
  • Connecting tubing of the same diameter.
  • Glass lined tubing (GLT) and plastic tubing.

Features, Benefits and Applications
  • Low dead volume.
  • Non - swaging, easy to remove fittings that will not deform tubing.
  • High temperature operations - ferrules are the temperature limiting component.

Available Sizes
  • 1/16" to 1/4"

Bulkhead Unions

Material Characteristics
  • Available in Stainless steel or Glass lined (GLT) Stainless steel.

Connections Suitable
  • Connecting tubing of the same diameter.
  • Glass lined tubing (GLT) and plastic tubing.

Features, Benefits and Applications
  • Low dead volume.
  • Non - swaging, easy to remove fittings that will not deform tubing.
  • High temperature operations - ferrules are the temperature limiting component.

Available Sizes
  • 1/16" to 1/4"

Reducing Unions

Material Characteristics
  • Stainless steel.

Connections Suitable
  • For connecting tubing of different diameters.
  • Suitable for glass lined tubing (GLT), metal and plastic tubing.

Features, Benefits and Applications
  • Non - swaging, easy to remove fittings that will not deform tubing.
  • No back ferrule required.
  • Gives greater flexibility with regards to micro - control valves.
  • Suitable for glass lined (GLT), metal and plastic tubing.

Available Sizes
  • 1/16" to 1/8", 1/16" to 1/4".

Reducing Bulkhead Unions

Material Characteristics
  • Stainless steel.

Connections Suitable
  • For connecting tubing of different diameters.
  • Suitable for glass lined tubing (GLT), metal and plastic tubing.

Features, Benefits and Applications
  • Non - swaging, easy to remove fittings that will not deform tubing.
  • No back ferrule required.
  • Gives greater flexibility with regards to micro - control valves.
  • Suitable for glass lined (GLT), metal and plastic tubing.

Available Sizes
  • 1/16" to 1/8", 1/16" to 1/4".

Union Tees

Material Characteristics
  • Stainless steel.

Connections Suitable
  • Union tees have the ability to have different size legs for different size tubing.

Features, Benefits and Applications
  • Allows splitting of the flow between two or more outlets.
  • Suitable for glass lined (GLT), metal and plastic tubing.
  • Non - swaging, easy to remove fittings that will not deform tubing.
  • No back ferrule required.
  • The male / female tees can be stacked in order to make a manifold of 1/16" tubing which can be used for drying samples or splitting sample stream to multiple outlets.

Available Sizes
  • All 1/16"
  • 1 leg 1/8" and two legs 1/16"
  • 1 leg 1/4" and two legs 1/16"
    The union cross is a four port union all set up to connect 1/16" tubing.

Union Cross

Material Characteristics
  • Stainless steel.

Connections Suitable
  • Union tees have the ability to have different size legs for different size tubing.

Features, Benefits and Applications
  • Allows splitting of the flow between two or more outlets.
  • Suitable for glass lined (GLT), metal and plastic tubing.
  • Non - swaging, easy to remove fittings that will not deform tubing.
  • No back ferrule required.
  • The male / female tees can be stacked in order to make a manifold of 1/16" tubing which can be used for drying samples or splitting sample stream to multiple outlets.

Available Sizes
  • All 1/16"
  • 1 leg 1/8" and two legs 1/16"
  • 1 leg 1/4" and two legs 1/16"
    The union cross is a four port union all set up to connect 1/16" tubing.

Glass Lined Mini Unions

Material Characteristics
  • Glass Lined (GLT) Stainless Steel.

Connections Suitable
  • Connecting fused silica and capillary tubing.
  • Tubing of different sizes can also be connected. However, mini union ferrules for the tubing that is different than the normal usage need to be purchased separately.

Features, Benefits and Applications
  • Inert due to glass lining.
  • Smaller in size than standard 1/16" unions, less of a heat sink and do not put extra weight on fused silica tubing connections.
  • Fused silica connections due to the reduced weight and thermal mass.

Available Sizes
  • 0.4 mm ID (for use with tubing <0.25 mm ID).
  • 0.5 mm ID (for use with tubing 0.32 mm ID).
  • 0.8 mm ID (for use with tubing 0.45 and 0.53 mm ID).

SilTite Mini Unions

Material Characteristics
  • Glass Lined (GLT) Stainless Steel.
  • SilTite® Mini Union utilize the SilTite technology – coupling SilTite ferrules with SilTite nuts.

Connections Suitable
  • Recommended as the best option for attaching fused silica tubing in the laboratory.
  • Please note that standard Mini Union nuts cannot be used with SilTite ferrules.

Features, Benefits and Applications
  • Allows for tubing to be connected without concern of leakage from temperature cycling or fear of getting pieces of the ferrule stuck inside the tubing.

Available Sizes
  • 0.4 mm ID (for use with tubing < 0.25 mm ID).
  • 0.5 mm ID (for use with tubing 0.32 mm ID).
  • 0.8 mm ID (for use with tubing 0.45 and 0.53 mm ID).
  • 1/32".
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