Need help with CGA 540 thread.

[Lert_vin_Kloss]

I'm sorry for my english, but google cannot help me with this question.

In CGA 540 connection standart, there is unusual thread. 0,903-14NGO-RH-EXT.
Our factory cannot make an adapter with such thread, with no technical documentation about this thread. "ASME/ANSI B1.2-1983 Gauges And Gauging For Unified Inch Screw Threads" doesn't contains such thread. They have only 0,875" thread.

Please, help me to find standart for this thread.

[Eric M]

This may help: CONCOA CGA Connection Reference Chart

Or this: http://www.asge-online.com/pdf/ASGEpg187.pdf

[Lert_vin_Kloss]

Thank you for your help, dear Eric, but i took my screenshot just from this page.

[Eric M]

Thank you for your help, dear Eric, but i took my screenshot just from this page.

Understood, but since I have no idea what searches you've done, I had to start somewhere. Have you searched for "Compressed Gas Association", and looked for their standards, rather than for ANSI / ASME standards? Standards & Publications - Compressed Gas Association

[Gordon B. Clarke]

Erik is giving good advice. When I look at the prices for these type connections and threads it might just be easiest to buy one of what you need. If you intend making many you can take the thread dimensions from what you buy.