Fountain Pen Nib Widths vs. Mechanical Pencil Leads
Comparing 2 standards across 15 specifications. 15 key differences identified.
Fountain Pen Nib Widths are standardized tip grinding grades that determine ink line width, categorized from Extra Fine (EF) to Double Broad (BB) and Calligraphic Stubs (1.1 mm to 1.5 mm). Crucially, Japanese nibs (Pilot, Sailor, Platinum) write approximately one full step finer than Western nibs (Pelikan, Lamy, Kaweco) due to the dense stroke requirements of East Asian kanji characters.
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.
Specification Comparison Table
15 Parameters| Parameter / Spec | ||
|---|---|---|
|
Extra Fine (EF)–Japanese
|
Approx. 0.20 to 0.28 mm line width (hairline precision) | — |
|
Extra Fine (EF)–Western
|
Approx. 0.35 to 0.40 mm line width (similar to Japanese Fine) | — |
|
Fine (F)–Japanese
|
Approx. 0.30 to 0.38 mm line width (standard everyday Japanese notebook writing) | — |
|
Fine (F)–Western
|
Approx. 0.50 to 0.60 mm line width (similar to Japanese Medium) | — |
|
Medium (M)–Japanese
|
Approx. 0.50 to 0.58 mm line width | — |
|
Medium (M)–Western
|
Approx. 0.70 to 0.80 mm line width (plentiful wet ink flow) | — |
|
Broad (B) & Stub (1.1 / 1.5 mm)
|
Broad: 0.9–1.0 mm | Stub: Flat rectangular tip with thick downstrokes and hairline cross-strokes | — |
|
Tipping Material
|
Sintered osmium/iridium/ruthenium platinum-group alloy sphere welded to gold or steel tines | — |
|
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) |