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Fountain Pen Sac Size Guide For Repairers

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36 replies to this topic

#21 crofton99



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Posted 22 September 2012 - 22:45

In response to a dearth of requests, I have just created a Fountain Pen Sac Size Guide for Repairers.

I write science papers and have always wanted to publish something with the phrase 'veritable dearth of information'. Seems editors never think this is a good idea and it gets redlined out ....

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#22 tenney



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Posted 23 September 2012 - 07:19

Thank you, Richard. What about some brands not found in that chart (oh, Swan, Conway Stewart, Unic, Wyvern, etc.)? If one's learning to re-sac their own pens, do you suggest just getting a set of sacs and then keep trying until it won't fit and then go down one size?
Glenn (love those pen posses)

#23 wasnhas


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Posted 09 March 2013 - 22:50

Thank you !

#24 Cognaticrotty



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Posted 05 April 2013 - 14:02

What sac would be needed for a mabie Todd blackbird? I'll post pix when it gets here
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#25 hbquikcomjamesl


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Posted 05 May 2013 - 22:22

A #16 straight sac is indeed a match for a Wearever Pennant. As is a 54mm J-bar (but note that the original J-bar has a ridge where modern ones have a channel, which means you'll have a slightly floppy lever).

James H. H. Lampert
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#26 rpk1204



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Posted 29 August 2013 - 20:01

Hey, anyone happen to know the correct sac size for a Salz Brothers Peter Pan pen?  Just restored one and need a sac.  I suppose I could just do it the old fashioned way and get the ruler out.....  Much smaller than an Arnold mini which takes a 14,so guessing it may be as small as a 10.  When I flushed the nib and feed I was amazed at how much ink came out. Thanks for any help!  The pen actually turned out pretty well and cute!

#27 sumgaikid


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Posted 11 September 2013 - 03:04

From the responses so far, it seems reports of its dearth have been greatly exaggerated...




No problem in my mind which sac to use; I just love this quote!     :lticaptd: :thumbup:



Edited by sumgaikid, 11 September 2013 - 03:05.

Irony is not lost on INFJ's--in fact,they revel in it.

#28 LWJ2



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Posted 09 November 2013 - 17:41

Thank you, kind sir. It was both generous and thoughtful of you to publish this.


Leon Jester

Roanoke, VA

#29 S-K



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Posted 03 August 2014 - 08:53

It seems the link not working now..

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#30 BookCat


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Posted 06 August 2014 - 04:01

Does anyone know which sac size (not length) I'll need to re-sac a Conway Stewart Dinkie 550?


Thanks Lots,


#31 Steven Mellemans

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Posted 07 November 2015 - 21:20

This is quite a list. I'm impressed!
Do I understand correctly that these sizes are not the original but your proposal for a best fit?


#32 PenjaminFranklin



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Posted 16 November 2015 - 02:37

This has proven to be quite helpful to me.  Thank you, Sir.



#33 corgicoupe


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Posted 15 November 2016 - 00:17

I just acquired a Parker Parkette the with a 0.30" nipple. The Esterbrook #16 was a tight fit, so I guessed at #17. Was this a good guess? It seemed to work.

Edited by corgicoupe, 15 November 2016 - 01:18.

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For love of it. And yet not waste time either.

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#34 AL01



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Posted 15 November 2016 - 00:42

In response to a dearth of requests, I have just created a Fountain Pen Sac Size Guide for Repairers.


Thank you for the useful guide!!!


Now I can repair the most expensive pen in the world.....


(It's totally NOT a Wearever Pennant.)  :)


Thanks Again!

#35 jcp1st


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Posted 25 March 2017 - 14:04

What size sac would be appropriate for the modern Conklin Mark Twain Crescent Filler? 

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#36 Ron Z

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Posted 25 March 2017 - 14:37

I you are not sure what sac size to use, you can measure the size of the sac nipple.  General sells a dial caliper with a scale graduated in 64ths of an inch.  A nipple diameter of say 18/64 would use a #18 sac, 20/64 would be use a #20 sac etc.  If you need to, you can go down a size, from 18 to 17 for instance, but not up because the sac would be loose on the sac nipple and would not be sealed or hold properly even with shellac.

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#37 MYU


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Posted 05 May 2017 - 22:15

I was previously trying to measure section nipple diameter by eyeballing it with a ruler.  And I think that method inherently ends up with a slightly smaller value.  As a result, when I bought some sacs recently, they turned out to be on the small side... enough that I had to shift my intended pens for installation.


Thankfully I discovered that I do have a digital caliper!  And I confirmed that my previous measurements were smaller than actual.


I have a question though. Two pens I measured came out as 7.6 and 8.6 mm in diameter. What sac sizes should I use for them?

7.6 --> #19 or #20 ?

8.6 --> #21 or #22 ?

Edited by MYU, 06 May 2017 - 20:59.

[MYU's Pen Review Corner]   |   "The Common Ground" -- Jeffrey Small

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