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Pen Sac Od By Size?

pen sac

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3 replies to this topic

#1 Gutbucketeer



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Posted 18 July 2019 - 02:58

Ok I'm very confused.


I thought I understood how to measure pen sac sizes for a pen and the dimensions of the sac to use for the pen once it is measured.


1. To figure out what sac to use measure the Outside Diameter of the section nipple and convert to 64s of an inch.  For example, a nipple that has a OD of 1/4" should take a # 16 sac.


2. I have read that the OD of the #16 sac should also be 1/4 inch.


However, I just received  4 #16 sacs from a supplier and their ODs are noticeably smaller than 1/4 inches.  More like 7/32.  (i.e. 14/64).  Did they send the wrong size, or is there supposed to be some stretch.

I will add a picture from my phone in a reply.





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#2 Gutbucketeer



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Posted 18 July 2019 - 03:14

Here is a pic

Attached Images

  • 20190717_231056_compress14.jpg

Edited by Gutbucketeer, 18 July 2019 - 03:40.

#3 Tweel



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Posted 18 July 2019 - 05:14

Those do look like #14 sacs (yes, #16 should be 1/4" OD).

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#4 Ron Z

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Posted 18 July 2019 - 15:36

You can make a sac gauge by drilling holes in a piece of flat stock with the appropriate size drills.  The sac should touch the sides of the hole all of the way around, but move through freely.

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