topic Re: Tapered thread in Fusion Design, Validate & Document Forum

Tapered thread

Oluwayimika_OLA — Mon, 06 Apr 2026 21:25:41 GMT

Hi, is there a way I can create a tapered thread model. I tried using the thread command on a tapered face from the circle I extruded, but I could even select the face. I tried moving it back in the timeline but it didn't show the threaded surface

Re: Tapered thread

Drewpan — Mon, 06 Apr 2026 23:54:35 GMT

Hi,

What is the purpose of a Tapered Thread? A standard thread or screw have clamping properties

that allow them to securely hold in place. A tapered thread would reduce those holding forces

and possibly not hold at all. Any thread will certainly prevent movement in the "upwards"

direction but a tapered thread probably would still allow rotation and not lock as securely and

maybe not lock at all.

Cheers

Andrew

Re: Tapered thread

a.laasW8M6T — Tue, 07 Apr 2026 00:05:37 GMT

Tapered threads are used in numerous applications, but most commonly for sealing Fluid fittings using either BSPT or NPT standards.

Re: Tapered thread

Drewpan — Tue, 07 Apr 2026 01:15:08 GMT

Hi,

Thanks for that. I have not come across them before. If you have a tapered thread

then wouldn't that affect how the threads lock down? As the thread gets "thicker"

it would get to a point where the thickness would prevent the thread from engaging

any further, sort of like a wedge? A normal thread locks due to friction between the

threads pulling them into each other. Wouldn't a wedge be a much weaker lock?

Is there any specific advantage to use tapered threads for fluids or is it some

traditional thing? I do know that threads can sometimes leak with fluids.

Cheers

Andrew

Re: Tapered thread

davebYYPCU — Tue, 07 Apr 2026 01:29:51 GMT

Is there any specific advantage to use tapered threads for fluids,

Yes. they are very common in fluid handling regimes - which rarely requires any clamping effect

They are designed to work efficiently in the tightening direction. to avoid

... (standard) threads can sometimes leak with fluids.

Might help....

Re: Tapered thread

TheCADWhisperer — Tue, 07 Apr 2026 17:26:54 GMT

@Drewpan

>>Tapered Pipe Threads<<

Re: Tapered thread

etfrench — Wed, 08 Apr 2026 08:36:45 GMT

A tapered coil can give you a close approximation of a thread. Create the coil. Revolve/Join a solid cone to create the proper valley width. Revolve/Cut another cone to create the proper crest width.

A sweep may give you a better thread form. Pipe should work but doesn't.

Re: Tapered thread

Oluwayimika_OLA — Thu, 09 Apr 2026 17:50:31 GMT

I'm back to this comment to say the solution is profound