Impulse Line - Fittings with tapered threads (iso-metric)

Instrumentation
1

All the catalogs of major vendor for compression fitting showing fittings as in INCH as per NPT, BSPP (ISO 228) and BSPT (ISO 7-1) standard.

Which standard cover the Metric Tapered Threads?

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2

Check this GUIDE

3

Thank you for your answers.

I already know these standard as NPT, BSPT, BSPP, Metri.

My doubt is relating the General Specification of the project where I’m currently working which say that:
FOR IMPULSE FITTING, UNTION ECT TAPERED THREADS (ISO-METRIC) SHALL BE USED.

Can I use BSPT standards and represent the measure in mm instead on inch?

For example for a compression male fittings: M12 x 12OD instead of 1/2" x 12 OD?

4

If the client have specific standard recommendation, then first check the application of these fittings.

Each standard has specific advantage in terms of their application.

These articles may help you.

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