The question I’m asked the most is regarding the size of my pens.
Here is a guide with lots of comparison photos.
Below are the different size diameter pens I make, measured at the barrel threads, with common pens listed below each similar size as reference. Section diameters are rough and will vary from pen to pen (these are handmade after all).
Slim – .45″/11.5 mm Ø threads, down to .427″/10.8 mm Ø section. The narrowest part is about .37″.
* Esterbrook J is .45″/11.4 mm at the threads
* Parker 51 about .47″/12 mm at the ring.
Small – .50″/12.5 mm Ø at threads, down to .477″/12.1 mm Ø section. The narrowest part is about .41″.
* Montblanc 146 is .48″12.2 mm at the threads.
* 1935 Parker Duofold Sr. is .49″/12.5 at the threads.
* Pelikan M800 is .49″/12.5 mm at the threads.
* 1930s Sheaffer OS Balance .49″/12.5 mm at threads.
* Sheaffer PFM/Legacy about .49″/12.5 mm at section/barrel join.
* Lamy Safari .48″/12.3 mm at barrel ring.
Medium – .55″/14 mm Ø threads, down to .527″/13.4 mm Ø section. The narrowest part is about .45″.
* Pelikan M1000 is about .53″/13.5 mm at the threads.
* Montblanc 149 is .562″/14.3 mm at the threads.
Large – .60″/15.2 5mm Ø threads, down to .57″/14.5 mm Ø section. The narrowest part is about .50″.
Oversize – .65″/16.5 mm Ø threads, down to .62″/15.75 mm Ø section. The narrowest part is about .55″.
Jumbo – .70″/17.75 mm Ø threads, down to .67″/17 mm Ø section. The narrowest part is about .60″.
Giant – .75″/19 mm Ø threads, down to .72″/18.25 mm Ø section. The narrowest part is about .65″.
* Indian eyedropper – .74″/19 mm at threads with .59″/15mm section.
Lengths – Measured with the cap off, from point of nib to end of barrel.
Measurements with cap on may vary depending on style of pen or if it will have a clip.
Shorter – 4.75″ or 120 mm open.
* Esterbrook J is 116 mm long open
Short – 5″ or 127 mm open – long enough to house a converter or other filling system, but no longer than that.
* Parker 51 – 127 mm open.
* Pelikan M800 – 127 mm open.
* Lamy Safari – 129 mm long.
Standard – 5.25″ or 133 mm open.
* Pelikan M1000 – 135 mm open.
* Montblanc 149 – 133 mm open.
Long – 5.5″ or 139.7 mm open.
Extra – 5.7″ or 146 mm open.
Longer? – You tell me what you want.
Production Elizabethan sizes
LARGE, 6.81″ (172.97 mm) closed, 5.75″ (146 mm) open, 7.625″ (193.67 mm)posted.Threads, .60″ (15.24 mm) Ø, section pinch .50″ (12.7 mm) Ø, barrel, .72″ (18.28 mm) Ø, cap.75″ (19.05 mm) Ø.
MEDIUM, 6.125″ ( mm) closed, 5.47″ (139 mm) open, 7.31″ (185.67 mm) posted.Threads, .55″ (13.97 mm) Ø, section pinch .46″ (11.68 mm) Ø, barrel, .67″ (17 mm) Ø, cap.695″ (17.65 mm) Ø.
SMALL, 5.7″ (145 mm) closed, 5.31″ (135 mm) open, 6.93″ (176 mm)posted.Threads, .50″ (12.7 mm) Ø, section pinch .415″ (10.54 mm) Ø, barrel, .62″ (15.748 mm) Ø, cap.65″ (16.5 mm) Ø.
Measuring your pen…
I get asked a lot of times to make a pen that’s similar in size to a pen you already have and love.
I don’t know how big most pens are and I don’t have a database, so if you could measure your pen for me, that would help.
It’s easy if you have some cheap calipers-
Measure the diameter of the barrel threads. This is the most important thing to me if you want your custom pen to be as close to another pen as possible. I may not match it exactly b/c I have a set range of sizes that I will make, but I can get it close.
If you don’t have calipers some tape works well for finding the circumferance.
Make a mark.
Cut your tape to the edge of the mark.
Measure that. This is 1 5/8″, which becomes 1.625″ in decimal form. Divide 1.625 by Pi, 3.14.
That gives us a diameter of .5175 inches, which isn’t exactly right, but pretty close. The better you mark and cut your tape the closer you’ll get to the actual diameter.
For the lengths, you can simply measure with a ruler.
For the section I only need to know length of the grip part.
Email your numbers to me – firstname.lastname@example.org
Whole pen, open (from tip of nib to end of barrel):