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Hammer Union Seals

Hammer Union Seals by Helix Engineering

Helix Engineering Manufactures Hammer Union Seals in Nitrile (also known as NBR, Buna, or Buna-N) for standard service, Viton® (also known as fluoroelastomer or FKM) for increased temperature and chemical resistance, HNBR for Sour Gas Service, or Teflon for high-temperature service (PTFE). 

Helix Engineering Manufactures Hammer Union Seals in the below sizes 

Hammer Union Seal Dimensions

Dimensions of Hammer Union Seals are typically defined by Size, which is in reference to its Inside Diameter (ID). Additional dimensional references include Outside Diameter (OD) and Height.


Size ID OD Height
2″ 2.06″ 2.81″ 0.57″
3″ 3.15″ 4.18″ 0.54″
4″ 4.19″ 5.18″ 0.54″

Hammer unions, also known as WECO couplings, are used in the oil and gas industry to quickly connect pipelines and flexible hose assemblies. A hammer union is made up of a coupler with a male thread and an inner cone (female half), a ball-shaped fitting (male half), and a female thread nut that tightens the ball-shaped fitting to the coupler's cone.

Close contact of the ball end with the cone (depending on the type) provides a primary sealing (metal/metal), or the sealing is accomplished through an additional rubber seal also known as hammer union seal (O-ring or lip seal).

Hammer union seals are used to prevent leakage in hammer union pipe connections and are commonly found in the Chemical Processing, Offshore Drilling, Petrochemical, and Water and Gas industries. Some of the common materials used to manufacture hammer union seals are Nitrile (NBR), Viton® FKM, HNBR, and PTFE. Anti-extrusion rings can be reinforced in Stainless Steel or Brass, in addition to the standard elastomer materials.

All our orders would be freely Door Delivered via DHL/FEDEX with a Transit time of just 3-4 days to any part of the world


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