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Originally Posted by
Ron Z
Sacs are measured in 64ths of an inch. So a #16 = 16/64 = 1/4". That's the outside diameter of the sac, so would be a snug fit on a 1/4" diameter sac nipple
Some consider this to be out of date, but I still on occasion check the size of a sac nipple using a dial caliper. I consider it a good place to start when I'm faced with an "unknown," though most repair people eventually develop a "calibrated eyeball," so can guess pretty accurately.
I like a snug fit on the sac nipple, so will measure the diameter and go from there. There are fractional calipers, both analog and digital, out there that are relatively inexpensive. General makes a plastic dial caliper, which I've seen at Lowes, so may be available in Canada. Harbor Freight sells a digital dial caliper, and Lowes may as well.
Convert the nipple diameter, which you said is 4.6mm, and it converts to 0.181" A #14, is .218" in diameter, so I think would be about right on the sac nipple of the pen. Check the fit. If its a snug fit on the sac nipple, and will slide in with talc on the sac, I'd use it.
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