Tube thickness

[Pdave]

Will .065 316 SS tube be thick enough for 24 tpi threaded endcaps? This will be 1.5 tubing for a 7.62 build.

[Dr.K]

Yes.

[Pdave]

Thanks

[Bendersquint]

You cold go to 20tpi if you wanted as well.

[Pdave]

Which would be better? I believe 20 TPI is what they are using on the Maglite conversions but the tube thickness is listed as .100 on the ones sold online. This is why I was concerned if there was going to be enough thickness on the .065 tubes since it seemed that most of the builds that use .065 are welding their end caps.

[Bendersquint]

Which would be better? I believe 20 TPI is what they are using on the Maglite conversions but the tube thickness is listed as .100 on the ones sold online. This is why I was concerned if there was going to be enough thickness on the .065 tubes since it seemed that most of the builds that use .065 are welding their end caps.

What does the Machinery handbook say the depth of the threads on a 24 and 20 tpi thread? That will tell you if there is enough to thread those tpi's.

If you don't have a copy.....you should.

[Historian]

Which would be better? I believe 20 TPI is what they are using on the Maglite conversions but the tube thickness is listed as .100 on the ones sold online. This is why I was concerned if there was going to be enough thickness on the .065 tubes since it seemed that most of the builds that use .065 are welding their end caps.

What does the Machinery handbook say the depth of the threads on a 24 and 20 tpi thread? That will tell you if there is enough to thread those tpi's.

If you don't have a copy.....you should.

+1

There are many old copies in used book stores for a pittance compared to
the latest version ... the compiled tables have not changed over the years.

[T-Rex]

For the threads reference.



Subtract your depth of cut from the wall thickness and use your result to calculate wall strength.

[c5_nc]

Which would be better? I believe 20 TPI is what they are using on the Maglite conversions but the tube thickness is listed as .100 on the ones sold online. This is why I was concerned if there was going to be enough thickness on the .065 tubes since it seemed that most of the builds that use .065 are welding their end caps.

Those tubes are using 1-7/16-20tpi threads, another's is using 1-7/16-24tpi threads. When it was discussed here before everyone seemed to indicate that 24 or 28tpi was the way to go, and 20tpi left it a bit thin. The 20tpi was projected to leave .027-.028" of metal at the base of the threads and 24tpi was to result in .035-036". Here is my 1.5" Tube threaded 24tpi, the calculations seemed to be accurate: