The question I’m asked the most is regarding the size of my pens.
Here is a guide with lots of comparison photos.
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.
Short – 5″ or 127 mm open – long enough to house a converter or other filling system, but no longer than that.
Standard – 5.25″ or 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.
Small and Medium sized Prospectors
Diameter – Measured at the barrel threads.
Note: Many options won’t work with thin model – certain filling systems and customizations- Thin works with #5 nibs only.
Thin – .40″/10.1 mm thick at threads with .37″/9.4 mm thick section.
Slim – .45″/11.5 mm thick at threads with .427″/10.8 mm thick section.
Small – .50″/12.5 mm thick at threads with .477″/12.1 mm thick section.
Medium – .55″/14 mm thick at threads with .527″/13.4 mm thick section.
Note: Most materials aren’t big enough for Large and Oversize pens to be made.
Large – .60″/15.25mm thick at threads with .57″/14.5mm thick section.
Oversize – .65″/16.5mm thick at threads with .62″/15.75mm thick section.
Jumbo – .70″/17.75mm thick at threads with .67″/17mm thick section.
Giant – .75″/19mm thick at threads with .72″/18.25mm thick section.
By request here are pictures of a standard size and length Shinobi next to several well known brands.
Size is usually 5 1/4″ closed, 5″ open, with 1/2″ barrel threads, and 19/32″ (.60″) barrel and cap diameter.
Small, standard size Shinobi comparison shots.
Small, short size Breaker with Esterbrook J, Parker 51, Pilot Kakuno, TWSBI, Breaker, Pilot 823, Pelikan M800, Lamy Safari, Montblanc 149.
Measurements of some popular pens.
Esterbrook J is .45″/11.4mm at the threads.
Montblanc 146 is .48″12.2mm at the threads.
Montblanc 149 is .562″/14.3mm at the threads.
1935 Parker Duofold Sr. is .49″/12.5 at the threads.
Parker 51 about .47″/12mm at the ring.
Pelikan 200/400/600 all about .43″/11mm at the threads.
Pelikan M800 is .49″/12.5mm at the threads.
Pelikan M1000 is about .53″/13.5mm at the threads.
1930 Sheaffer OS Balance .49″/12.5mm at threads.
Sheaffer PFM/Legacy about .49″/12.5mm at section/barrel join.