Mechanical Pencil Leads vs. Standard International Cartridge
Comparing 2 standards across 13 specifications. 13 key differences identified.
Mechanical Pencil Lead Sizes (standardized under ISO 9177-2) define polymer-bonded graphite refill diameters: 0.2 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, and 2.0 mm leadholders, with a standard length of 60.0 mm. Sized for specific drafting and handwriting pressures, 0.5 mm is the universal drafting standard and 0.7 mm is the heavy-pressure writing standard.
The Standard International Cartridge (also known as the European or Universal cartridge) is the dominant standardized fountain pen ink format, featuring a 2.4 mm nozzle opening sealed with a plastic sphere. Available in Short (38 mm / 0.85 ml) and Long (72 mm / 1.4 ml) sizes, it is used by dozens of European and American fountain pen manufacturers.
Specification Comparison Table
13 Parameters| Parameter / Spec | ||
|---|---|---|
|
0.2 mm Lead (Pentel Orenz)
|
0.20 mm — ultra-micro drafting and mathematical annotation (requires sliding guide pipe) | — |
|
0.3 mm Lead (Drafting)
|
0.35 mm actual diameter — technical engineering drafting, complex kanji, fine stippling | — |
|
0.5 mm Lead (Universal)
|
0.50 mm actual diameter — the global standard for students, drafting, and office writing | — |
|
0.7 mm Lead (Heavy Pressure)
|
0.70 mm actual diameter — robust everyday writing, resists snapping under heavy hand pressure | — |
|
0.9 mm Lead / 1.3 mm Lead
|
0.90 mm to 1.30 mm — woodworking carpentry, standardized test bubble filling, primary school | — |
|
2.0 mm Leadholder (Clutch Pencil)
|
2.00 mm diameter × 130 mm length — architectural sketching, requires rotary lead pointer sharpener | — |
|
Standard Refill Length
|
60.0 ± 1.0 mm (for 0.2 mm to 0.9 mm polymer high-polymer leads) | — |
|
Short Cartridge Dimensions
|
— | 38.0 mm length × 7.0 mm diameter (approx. 0.80 to 0.85 ml ink capacity) |
|
Long Cartridge Dimensions
|
— | 72.0 mm length × 7.0 mm diameter (approx. 1.40 to 1.50 ml ink capacity) |
|
Bore / Nozzle Diameter
|
— | 2.4 ± 0.05 mm (friction-fits over the pen feed nipple) |
|
Internal Seal
|
— | Floating polystyrene bead / puncture disc pushed into cartridge body upon insertion |
|
Two-in-Barrel Tandem Storage
|
— | Most full-size pens store one active short cartridge plus one inverted spare short cartridge in the barrel |
|
Brand Compatibility
|
— | Kaweco, Pelikan, Montblanc, Faber-Castell, Visconti, Diplomat, Caran d'Ache, Jinhao, Waterman (long) |