ZUFEK
Define every supplied component
Identify the screw, plain or spring washer, seal or other retained element by drawing or controlled specification. Include the material and finish of each component. A general note to add a washer can leave dimensions and properties unresolved.
Show the stack order and retention
Provide a section or assembly view showing the sequence and which elements are retained before installation. Explain the required freedom of movement. The manufacturing route should establish how components are assembled and held without damaging threads or functional surfaces.
Review treatment and material compatibility
Heat treatment, coating and cleaning may need to occur before or after assembly depending on the components. Seals and coated washers can introduce restrictions. Confirm the sequence for the approved set rather than assuming a process suitable for the bare screw is suitable for every assembled element.
Inspect the delivered assembly
Acceptance can include component presence, correct order, retention and the specified dimensional or functional checks. Keep these separate from the screw thread inspection. Packaging should protect the assembly condition and make it practical to confirm that the complete set was supplied.
Specification example
For a screw carrying an O-ring and washer, provide the assembled section and the permitted retention condition. This allows the quotation to account for both the metal part and the handling of the sealing element.
RFQ checklist
- Component list and specifications
- Stack order and movement
- Retention method
- Treatment and cleaning sequence
- Delivered-assembly acceptance
Use the RFQ preparation checklist, then submit your drawing for review. For acceptance requirements, see quality planning.
General guidance only. Material properties, tolerances, standards and manufacturing feasibility must be verified for the actual specification. This article does not establish a product performance guarantee.