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Which pressure figure governs your test connection
A diagnostic connection carries two separate pressure numbers: the maximum working pressure it holds once made up, and the lower pressure at which the two halves may still be joined and parted by hand. Choosing on the wrong one is how a gauge ends up going onto a circuit that is above the connect-under-pressure limit. Enter your circuit pressure and the two rated figures from your drawing or quotation, and this tells you which number applies and how much margin is left.
Convert before you compare
Compare parts across brands in bar rather than in psi. Published imperial equivalents for the same bar figure differ between catalogues by a few per cent, which is enough to make two identical connections look like different pressure classes on a purchase order. This converter uses the NIST SP 811 factor of 14.5037738 psi per bar.
Where the two figures come from
| Figure | What it means | Where the number comes from |
|---|---|---|
| Maximum working pressure | What the connection holds once it is made up and stays made up | The product specification for that part number |
| Connect-under-pressure limit | The pressure at which the halves may still be joined and parted by hand, without tools | Always the lower figure; confirmed per model on the drawing and in the quotation |
ISO 15171-2:2016 describes M16×2 diagnostic couplings that can be connected under pressure without tools to a maximum of 40 MPa (400 bar), while couplings to that part may be used at a maximum working pressure of 63 MPa (630 bar). The defaults above carry those figures. Replace them with the rated figures for your own part number before relying on the result, and treat this page as a selection aid rather than a substitute for your maintenance procedure.
