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Old 11-06-2017, 09:48 PM   #1 (permalink)
 
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Default Parker Duofold section to body threads?

Does anyone know what threads are used on the section to body of a Parker Duofold Centennial?
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Old 11-07-2017, 09:54 AM   #2 (permalink)
 
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Sorry, I don't -- but I have a Duofold (Centennial? International? Not sure what the exact name of this model is).

I doubt that I'd be able to read the pitch with sufficient accuracy to create a barrel that the section would fit, but I'll take a look. Might be a day or two before I get to it.

Meantime -- you could check out www.FountainPenNetwork.com to see if the question has already been asked & answered there.
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Old 11-07-2017, 01:11 PM   #3 (permalink)
 
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That would be awesome! I have searched fountain pen network to no avail. I have someone that will supply me with the section, but I don't have it so I can't measure the pitch unfortunately.

No rush of course. Thank you.
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Old 11-09-2017, 09:01 AM   #4 (permalink)
 
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Quote:
Originally Posted by duncsuss View Post
Sorry, I don't -- but I have a Duofold (Centennial? International? Not sure what the exact name of this model is).

I doubt that I'd be able to read the pitch with sufficient accuracy to create a barrel that the section would fit, but I'll take a look. Might be a day or two before I get to it.

Meantime -- you could check out www.FountainPenNetwork.com to see if the question has already been asked & answered there.
Well, I became a member of the fountain pen network and found that the thread pitch is most likely .75 and the thread is either 8.5 or 9, so that is easy and cheap to try at least. I might even have both dies.
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Old 11-09-2017, 09:41 AM   #5 (permalink)
 
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Glad you posted, I'd forgotten. Here's what I find when I measure mine:

The diameter of the un-threaded portion behind the threads (which looks the same as the major diameter of the threads) is 8.72mm (0.343", 11/32")

The diameter of portion which slips through the barrel threads (which looks the same as the minor diameter of the threads) is 8.06mm (0.317", 41/128").

Attempting to line up the peaks of my M9 x 0.75 tap with the valleys in the section, it looks like 0.75 is a very close match. My eyes (even with a x10 visor on) aren't good enough for me to say if it's an exact match.

If this really is a metric tap. I'd be inclined to guess at M 8.75 x 0.75.

HTH
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Old 11-09-2017, 11:34 PM   #6 (permalink)
 
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Well then, I will get the 8.75 x .75 and the 8.5 x .75 if I don't already have it and try both!

Thank you for your time. I appreciate it.
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Old 11-10-2017, 07:56 AM   #7 (permalink)
 
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I found out the other day that you can buy ready made Bock #5 and #6 sections and they have a M8.5X1 thread.
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Old 11-10-2017, 08:37 AM   #8 (permalink)
 
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Where can you get those?
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Old 11-10-2017, 08:46 AM   #9 (permalink)
 
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Lewis,

See here:

Sections for custom fountain pens and kitlss pens

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Old 11-10-2017, 09:01 AM   #10 (permalink)
 
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Thank you Bill.

It's an interesting option, particularly since the bock #5 housing is so picky. I expected them to be Ebonite though! But, the plating options are very nice.
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