Сutting Thread On Section

[alexro]

Thinking of restoration of Wahl Oxford with twist-fill, I want to use the donor section without thread and to cut it.

Do they used some standards for threads? I measured the diameter as 0.34 inches and counted about 8 turns per 0.174 inches (see the picture). Please advice me what thread-cutting die should I look for?

[fountainbel]

Hi Alexro,

Threads on these vintage pens are mostly not standardized.

And given the dimensions you specified it seems also the case with your section threads.

Your dimensions are pointing to 48 TPI threading , however the outer diameter does not look being a" standard" size.

On most vintage pens - even Montblanc - the section threads are 36TPI, but I know Wahl used finer section threading.

I don't expect you will find a die for cutting these threads, the only possibility is cutting the threads on a lathe.

Francis

[FarmBoy]

As Francis says, just cut the threads on your lathe. The cost of a custom tap and die will be excessive.

[Ron Z]

The best way to measure thread pitch is with a thread gauge. They're available for both metric and standard threads, and cost between $15 and $20 for a full set. Once you know the pitch, you can cut the thread to any diameter you need on a lathe.

 

Custom dies and taps are available - but you'll pay quite a bit. One vendor here in the US will make any size you want - for about $150 in singles. Multiples will take the cost down to about $30 each.

[alexro]

Thanks to all for replying. I think I will drop that idea as not money/time reasonable.