Chinese pipe fitting manufacturing processes - GIFs

**Jon** · Dec 17, 2020, 03:08 PM

Chinese pipe fitting manufacturing processes. Not exactly sure what these are for.

**jimfols** · Dec 17, 2020, 06:27 PM

I like the way the first one cuts to and fro.

**thevillageinn** · Dec 18, 2020, 07:07 PM

Watching them run those taps in its easier to understand why the fittings we get here are so poor.

**NeiljohnUK** · Dec 21, 2020, 07:27 AM

Originally Posted by thevillageinn

Watching them run those taps in its easier to understand why the fittings we get here are so poor.

Agreed, straight through unions with a parallel thread made "cheap as chips", Lord alone knows what the steels quality is like, probably the worst mixed remelt going if it's anything like most of the Chinesium steels used in such fittings. "it's as good as Swagelok" according to one supplier, it's not even close to HamLet or even Hoke...

**Crusty** · Dec 21, 2020, 08:31 AM

They didn't show the QC guy with his fabric tape measure checking the parts for accuracy.

**lavern s** · Apr 21, 2025, 08:04 AM

I'm a little confused. Apparently those are a straight pipe thread, NPS, and not a tapered NPT. They are tapping straight through with the tap being dropped to the bottom. Correct me if I am wrong. Are pipe couplers tapered from both ends? Or are these a coupler of a different type? thanks.
LaVern

**Floradawg** · Apr 21, 2025, 01:22 PM

Originally Posted by lavern s

I'm a little confused. Apparently those are a straight pipe thread, NPS, and not a tapered NPT. They are tapping straight through with the tap being dropped to the bottom. Correct me if I am wrong. Are pipe couplers tapered from both ends? Or are these a coupler of a different type? thanks.
LaVern

I was thinking instead of being for pipe containing fluids it may be couplers for electrical conduit. I don't know if conduit couplers have parallel threads or not. But those do look like schedule 80.