api thtead form data 1

[noodles666]

i'm after technical specs on 3 1/2" and 4 1/2" api thread forms, taper angles, major/minor dia, clearances, etc can any one help?

 

[eddiewdi]

Not exactly sure what your looking for, but start with a copy of API 5B.

 

[ovlvalves]

Hi Noodles666,

I know that an 1/2"API thread form is exactly the same as a 1/2" NPT thread to ANSI B1.20.1. We supply this thread type in a number of subsea valves to API6A PSL3/4.

I don't know about the bigger thread types as never doen them but seen them on items such as tubing hangers etc with end users. I would suggest you talk to machine tool supplier such as SECO or good thread gauge supplier - recommend you contact TRU THREAD gauges in the UK, they are both UKAS and API accredited for gauging. John Glover at TRU THREAD should be able to help you.

 

[DrillerNic]

Do you mean the API thread forms 3-1/2" IF and 4-1/2" IF (correctly called NC38 and NC50) for drill pipe? If so, API 5B is where to go!