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Fountain Pen Sac Size Guide

(This page revised August 1, 2019)

Reference Info Index | Glossopedia  ]

Brands Covered on This Page

Chilton Conklin Esterbrook Eversharp Ingersoll (Chas. H.) Moore
Parker Sheaffer Wahl Waterman

The charts on this page are a guide to choosing appropriate sac sizes for various sac-filling pens. The sizes listed here are not the sizes the original manufacturers used. Pen manufacturers chose the largest sacs they could cram into their pens in order to yield the greatest possible ink capacity, but there are some drawbacks to that method:

For these reasons, the charts recommend sacs that are usually one or two sizes smaller than the sizes originally used; but in some cases, the difference can be as great as four sizes. In most cases, the smaller sac size vitiates the need for a necked sac; unless otherwise specified, all sacs listed here are straight sacs. For pens not listed, choose the largest sac that drops freely into the barrel with the pressure bar in place.

In the tables on this page, necked sacs are indicated by the letter N, tapered sacs by the letter T.

Note: If you are using a modern two-piece replacement pressure bar (illustrated here), choose a sac one or two sizes smaller than indicated in the chart. (Go by the “drops freely into the barrel” criterion.)

Modern pressure bars

Instructions for resacking many pens are available on this site, as follows:

Sac Sizes by Brand

Chilton Pens
Pen Model(s) Sac Size
Chiltonian 18
Golden Quill 18
Wing-flow (standard girth) 18
Conklin Pens
Pen Model(s) Sac Size
Duragraph (lever filler) 21
Endura (slender girth) 17
Endura (standard girth) 21
Glider (slender girth) 15
Glider (standard girth) 17
Symetrik (standard girth) 17
2NL, 2P, 20, 20P Crescent-Filler 17
25P Crescent-Filler 15
3NL, 3P, 30, 30P Crescent-Filler 17
4NL, 4P, 40, 40P Crescent-Filler 18
5NL, 50 Crescent-Filler 20
6NL, 60 Crescent-Filler 21
75 Crescent-Filler 22
Esterbrook Pens
Pen Model(s) Sac Size
C, CH (J-series “purse” pens) 16
Deluxe (SM, LK) 16
Dollar Pen Size B (standard girth) 18
Dollar Pen Sizes A and H (slender girth) 16
J, LJ, SJ 16
M2 (squeeze filler) 16
Safari (lever filler) 16
Safari Plunger-Fill Ink-Vue (full size)
Wahl Pens
Pen Model(s) Sac Size
Coronet 16
Doric (slender girth); includes Doric Junior 15
Doric (standard girth); includes Popular Doric 17
Fifth Avenue 16
Metal pens, No 2 nib (ringtop, 3" long) 15
Metal pens, No 3 nib (clip or ringtop, 4" long) 16
Metal pens, No 4 nib (clip, 5" long) 19
Metal pens, No 5 nib (clip, 4" long) 20
Pacemaker (slender girth) 15
Pacemaker (standard girth) 18
Personal Point (oversize) 20
Personal Point (slender girth) 16
Personal Point (standard girth) 18
Sixty Four 16
Skyline Demi 16×2 NT
Skyline Executive 18
Skyline Standard 16×2 NT
Slim Ventura (squeeze filler) 15
Symphony, 1st generation (Loewy) 15×2 NT
Symphony, 2nd & 3rd generations 17
Ventura 16
Chas. H. Ingersoll Pens
Pen Model(s) Sac Size
Bakelite twist filler 20
Metal twist filler 22
Moore Hard Rubber Pens
Pen Model(s) Sac Size
82, L-82 13
83, L-83 14
84, L-84 15
85, L-85 17
86, L-86 20
92, L-92 13
93, L-93 14
94, L-94 15
95, L-95 17
96, L-96 20
Moore Celluloid Pens
Pen Model(s) Sac Size
Finger tip (96-B) 17
82, L-82 14
83, L-83 15
84, L-84 16
85, L-85 18
86, L-86 22
92, 92-A, L-92 15
93, L-93 15
94, 94-A, L-94 16
95, L-95 18
96, 96-A, L-96 20
Parker Pens
Pen Model(s) Sac Size
Duette Jr. “Thrift Time” 15
Duette Sr. “Thrift Time” 17
Duofold Geometric (“Toothbrush”), slender girth 15
Duofold Geometric (“Toothbrush”), standard girth 17
Duofold Jr., Duofold Special 16
Duofold, Lady 15
Duofold Senior 19
Duofold, Striped, Junior (button-filler) 16
Jack-Knife Safety 20, 20 15
Jack-Knife Safety 23, 23 15
Jack-Knife Safety 26, 26 19
Moderne “Thrift Time” (Canadian) 15
Parkette Zephyr 14
Pastel (larger size) 15
Pastel (smaller size) 12
Premier “Thrift Time” (Canadian) 17
Raven 15
True Blue 15
Vacumatic Junior, standard girth (Lockdown) Standard Diaphragm
Vacumatic Maxima (Speedline or plastic plunger) Standard Diaphragm
Vacumatic Oversize (Lockdown) Oversize Diaphragm
Vacumatic Senior Maxima (Speedline) Oversize Diaphragm
Vacumatic Standard (Lockdown) Standard Diaphragm
All Vacumatic-filling pens not listed Deb Diaphragm
VS 16
“51” Aero-metric Demi/Slender See note below
“51” Aero-metric Standard Pli-Glass
Sheaffer Pens
Pen Model(s) Sac Size
Autograph (postwar, largest size) 19
Balance (oversize) 20
Balance (slender girth) 15
Balance (standard girth) 17
Fineline 17
Lifetime Flat-Top (celluloid, slender girth) 15
Lifetime Flat-Top (celluloid, standard girth) 16
Lifetime Flat-Top (celluloid, oversize) 20
PFM 17×2 N
Snorkel 14×2 N
Touchdown TM 15×2 N
Touchdown (1949 “fat”) 17×1 N
2 Self-Filling, 2A Self-Filling 14
4 Self-Filling 16
5 Self-Filling 17
3-25 15
5-30 (slender girth) 15
5-30 (standard girth) 17
7-30 19
22 Student Special 14
46 Special (slender girth) 14
46 Special (standard girth) 16
Waterman Hard Rubber Pens
Note: overlay pens use same sac sizes as
basic models; e.g., 452 uses same sac as 52.
Pen Model(s) Sac Size
5 “Ripple” 15
7 “Ripple” 16
12 PSF, 12V PSF 15
12 PSF, 12V PSF 13
14 PSF 15
15 PSF 16
16 PSF 18
52, 52V 15
52, 52V 13
54 15
55 17
56 19
94 16
Patrician (black only, uncommon) 18
Waterman Celluloid Pens
Pen Model(s) Sac Size
3, 3V 16
5 16
7 17
32, 32V 16
52 16
92, 92V 16
94 17
Citation (Taperite or open nib) 16
Commando (ladies’) 14
Commando (men’s) 16
Crusader (Taperite or open nib) 16
Dauntless (Taperite or open nib) 16
Emblem Pen Standard 15
Emblem Pen De Luxe (oversize) 18
Hundred Year Pen Standard 15
Hundred Year Pen De Luxe (oversize) 18
Ink-Vue (Type 1) Ink-Vue (full size)
Ink-Vue (Type 2) (See repair article)
Lady Patricia Ink-Vue Ink-Vue (Lady Pat)
Lady Patricia lever filler 14
Medalist (Taperite or open nib) 16
Patrician 18
Stalwart 16
Stateleigh (Taperite or open nib) 16

  1. A correct Pli-Glass sac is not available for the Demi. A No 14 vinyl sac (often sold as “silicone”) will fit when cut to 2" long; there are also some vinyl sacs available that resemble the original “51” sac but are too small for a full-size “51” — these sacs will work well in a Demi.

  2. The correct Pli-Glass sac, as noted in the table, is available from IndyPenDance and These sacs are the exact same material, size, and shape as the originals that Parker used.

  3. The correct size sac for the Touchdown TM, as noted in the table, is 15×2 Necked. At the time of this writing, this sac was not available from any known source. Substitute a No 15 straight sac cut to a length of 2".

The information in this article is as accurate as possible, but you should not take it as absolutely authoritative or complete. If you have additions or corrections to this page, please consider sharing them with us to improve the accuracy of our information.

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