Short answer
When preparing an order from a sample, visible dimensions must be separated from unknown service conditions. A sample is valuable for investigating product identity; however, on its own it does not show why it was selected in the past, how it was used, or whether it is suitable for the new application.
Technical explanation
Hose labels, the sealing type of the end connection, thread pitch and dimensions are examined together. Because a used sample may show length change, deformation and wear, the condition under which the measurement was made matters. In particular, thread identification should not be based only on visual similarity or on being able to turn it a few times into a mating part. Testing under pressure is not an acceptable method for identifying an uncertain connection type.
Topic-specific checkpoints
| Item | Description |
|---|---|
| Identity | Legible brand, product code, size and batch marking. |
| End inspection | Thread geometry, pitch, sealing surface and mating part. |
| Geometry | Length reference, A/B orientations and the deformation condition of the sample. |
| Missing data | Service pressure, temperature, fluid and expected documents. |
How is it assessed in practice?
The recommended sample inspection record includes an overall photo, close-ups of both ends, legible markings and a measurement table. The statement of the person who removed it is kept on a separate row: 'the same one is wanted' is not entered as a technical measurement result. If the label has been erased, say 'not identified' instead of writing an assumed brand in the manufacturer and model field. Finally, prepare a drawing for the new product, and do not copy damage seen on the sample into the drawing as if it were target geometry.
Original editorial recommendation; not a clause of a standard.
Frequently asked questions
If the sample is assembled and looks sound, is it considered suitable?
This is only an observation. The appearance of the sample does not prove service suitability or remaining life. The service conditions of the new order must be defined separately.
Source coverage
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S019
4 Easy Steps to Identify Hydraulic Threads Parker Hannifin · accessed 2026-10-19 PDF page 1-2: thread identification
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S021
Selecting a hose assembly? Remember STAMPED Swagelok Bangalore · accessed 2026-10-19 Size; Temperature; Application; Material; Pressure; End Connections; Delivery