API SPEC 7HU2:2022 specifies minimum requirements for the dimensional and functional interchangeability, design,materials, inspection, marking, storing, and shipment of hammer union parts and assemblies for use in the petroleum and natural gas industries.
This standard does not address the manner (i.e. integral, weld or thread) in which hammer unions are attached to other parts. Requirements for repair and remanufacture of hammer union parts are not included in this standard.
WARNING Hammer unions manufactured under the requirements of this standard are only to be considered interchangeable with hammer unions also manufactured to the requirements of this standard. Hammer unions manufactured under the requirements of this standard are assumed to not be interchangeable with hammer unions not conforming to this standard.
