General engineering information; project-specific suitability requires review. General information does not establish a Xinwei product rating or suitability for a specific application.
The useful output is a shared acceptance basis
A quotation is easier to compare when each supplier receives the same controlled geometry, use conditions and inspection requirements. Start with a part drawing and the mating interfaces. If you only have a sample, state that dimensions and material still need to be established; do not let an undocumented sample become a silent production standard.
1. Control identity, units and revisions
Give the part a drawing reference and revision. State units, scale and which document controls if the CAD model, drawing and physical sample disagree. Include a clear top-level view and section views through the sealing or retaining features. An internal purchasing reference is useful, but it is not evidence of a manufacturer's existing SKU.
- Use one consistent end/port labeling system across the drawing, model and inquiry.
- List the files supplied and their revisions.
- Identify sample condition: unused, assembled or removed after service.
2. Mark what the geometry does
Highlight sealing faces, locating grooves, clamping zones and visible surfaces. Show the surrounding parts at the critical interface. For a profile seal, a fully dimensioned section is more useful than a rendered outline; for a hose, the end positions and clocking need installation datums.
- Round ring: ID, section and mating gland.
- Gasket: outline, thickness, sealing land and openings.
- Grommet: panel hole/thickness and cable or tube envelope.
- Bellows: compressed, nominal and extended positions plus offsets.
3. Separate dimensions from acceptance methods
Prioritize features that determine fit and function. Write the required tolerance next to the controlling dimension, and state the measurement condition if the part is flexible. Avoid adding a tight general tolerance to every feature without considering how it will be checked. Mark flash and parting-line restrictions where they matter to sealing or appearance.
4. Add the exposure and assembly brief
A drawing cannot define compatibility by shape. List medium, concentration, continuous and peak temperatures with duration, pressure/vacuum and motion. Add cleaning agents and assembly lubricants. Describe how the part is inserted, stretched, clamped or compressed, and whether tools or aids are allowed.
5. Agree the sample and release questions
Before tooling or a production order, resolve which proposed material and construction are being evaluated, what sample dimensions will be reported and which assembly checks establish approval. Quantity, packaging and requested documents belong in the inquiry; do not assume a public MOQ or lead time.
- Who approves the drawing and any proposed deviations?
- Which dimensions, visual checks and assembled functions are acceptance criteria?
- Which documents must identify the drawing revision and material?
- How will changes after sample approval be controlled?
A final check before sending
A complete package allows the supplier to ask focused questions. It does not guarantee manufacturability or service performance. The general O-ring design reference below is included to show why the mating housing and installed state matter; it is not a substitute for the design owner's review.
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General references and scope
These references explain general engineering or regulatory context. They are not Xinwei finished-product specifications, test results or compliance evidence.
- O-Rings Online — General design inputs: O-ring size, housing layout, compression, stretch and housing fill are distinct review matters. Not Xinwei size availability or dimensional qualification.