API Spec 7HU2 Hammer Union Seal Production Guide
Royal WayAPI Spec 7HU2 covers dimensional and functional interchangeability, design, materials, inspection, marking, storage and shipment for oilfield hammer unions. The union seal is one part of the complete connection. Before production or replacement, confirm the exact union identity, seal profile, size, material requirement, inspection documents and applicable edition of the standard.
What API Spec 7HU2 covers
API published Spec 7HU2 to address incompatibility and mismatching of hammer union components. Its public scope includes minimum requirements for dimensional and functional interchangeability, design, materials, inspection, marking, storage and shipment.
The public scope helps buyers organize a quotation and technical review. The licensed standard, including any current addenda or errata, remains the controlling source for order requirements and acceptance criteria.
Where the union seal fits
A hammer union combines metal components with a sealing element. The seal must match the approved connection design. It cannot compensate for worn, damaged or mismatched union components.
Keep the following information together when requesting a replacement or production quotation:
- FIG number or complete visible marking.
- Nominal size and seal profile.
- Drawing, controlled part record or approved sample.
- Seal dimensions and visible construction features.
- Required compound, hardness or material standard.
- Service medium and available temperature or pressure information.
- Inspection, traceability, marking, packaging and shipment requirements.
A similar appearance alone does not confirm fit or interchangeability.
Production and inspection review
| Review area | Information to confirm | Why it matters |
|---|---|---|
| Connection identity | FIG, nominal size, profile, drawing and controlled revision. | Links the seal request to the correct hammer union connection. |
| Seal interface | Seal geometry and its relationship to the approved union design. | Supports dimensional review before tooling, sampling or production. |
| Materials | Required compound, hardness and applicable material standard. | Defines the material requirement without relying on colour or appearance. |
| Inspection | Required dimensional, visual, material and test records. | Establishes the inspection scope and acceptance documents for the order. |
| Marking and traceability | Part identity, lot or batch linkage and required certificates. | Connects the supplied parts with the applicable production and quality records. |
| Storage and shipment | Packaging, handling and shipment requirements stated by the customer or applicable standard. | Protects the seals during storage and delivery. |
Confirm the applicable requirements for each order
Royal Way reviews the drawing, material requirement, inspection scope and traceability documents supplied with the inquiry. Product fit, interchangeability and conformance depend on the exact connection and the requirements agreed for that order.
If API Spec 7HU2 is specified, identify the applicable edition and the required clauses or acceptance documents in the RFQ. Certification, approval or monogram status should be confirmed separately for the exact product and order.
RFQ and production review checklist
- Exact FIG, nominal size and all visible union markings.
- Drawing, controlled part record or an identity linked sample.
- Front, back and side photographs of the removed seal and any backup component.
- OD, ID, height and profile measurements, with the measurement source identified.
- Material, hardness and service information from the customer requirement.
- Required inspection, certificate, marking, traceability, packaging and shipment documents.
- Quantity, destination and required document format.
Documentation support
COC, MTR and batch related quality documentation can be provided according to customer and order requirements. Customer drawings, inspection records and order documents are handled through the RFQ and order process rather than published on the website.
Related Royal Way resources
Source
This guide uses API's public announcement for Spec 7HU2 and the API Standards Plan to describe the standard's public scope. Obtain the applicable licensed edition and verify its current addenda or errata before finalizing production or inspection requirements.
Frequently asked questions
Does API Spec 7HU2 automatically certify a union seal?
No. Confirm certification or approval for the exact product and order. A product name, colour or FIG reference does not establish certification.
What should be checked before producing a replacement union seal?
Confirm the union identity, seal profile, nominal size, material requirement, service conditions, inspection scope and traceability requirements. Keep the controlling drawing or part record linked to the inquiry.
Can a similar looking seal be treated as interchangeable?
No. Use the approved design and inspection requirements for the exact connection. Similar appearance does not prove dimensional or functional interchangeability.
Does the public API announcement replace the purchased standard?
No. The announcement summarizes the scope. Check the applicable licensed edition, revision, addenda and errata before finalizing production or inspection requirements.