Pipe Fittings

Stainless Steel Lab Joint Stub End

Stub Ends are fittings used in place of welded flanges where rotating back up flanges are desired. They are also called Lab Joints and Vanstone Flared Labs. A rotating back up flange seats itself against the back surface of the Stub End. When bolts are added, the clamping action of the bolts presses the rotating back up flange against the back of the Stub End. The gasket surface of the Stub End then presses against a gasket and another gasket surface providing joints like standard flange joints. The seal is made by the gasket surface of the stub end alone, the flange only provides the clamping pressure on the joint.

Stub ends (Butt weld fittings ) are tested and verified for durability, accuracy and precision. The stub ends are manufactured in all standard dimensions. The stub ends are provided with a standard weld bevel and can be available in squared, flanged, victaulic and threaded ends.

Stainless Steel Lab Joint Stub End


  1. high strength.
  2. fine corrosion resistance.
  3. low density, light weight.
  4. high/low temperature resistance.
  5. high resistance to strong acid or alkali.



Manufacturing standards : 

  1. ASTM ASME A/SA 403 MSS SP43 & SP75 ANSI B16. 9 ANSI B16. 28 ASTM A815 ASTM B363 B366 
  2. DIN2605 DIN2615 DIN2616 DIN2617
  3. JIS2313

Size Range:1/2"-24"(DN15-DN600)

Thickness Code:Sch.5S,Sch.10S,Sch.40S

Stainless Steel Lab Joint Stub End

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