Parker G2 Refill vs. Mechanical Pencil Leads
Comparing 2 standards across 14 specifications. 14 key differences identified.
The Parker-Style G2 Refill (standardized under ISO 12757-2 Doc G2) is one of the most widely adopted ballpoint and gel pen refill standards. Measuring 98.1 mm in length and 5.8 mm in body diameter with a stepped metal barrel and grooved plastic crown cog, it is used by hundreds of luxury pen brands and custom machined EDC pens.
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
14 Parameters| Parameter / Spec | ||
|---|---|---|
|
Overall Length
|
98.1 ± 0.3 mm (3.86 in) | — |
|
Main Body Diameter
|
5.8 ± 0.1 mm (0.228 in) | — |
|
Stepped Tip Diameter
|
2.5 mm extending 18.0 mm from barrel shoulder | — |
|
ISO Standard Code
|
ISO 12757-2 Type G2 (Documentary permanence proof) | — |
|
Crown Cam Geometry
|
Molded nylon cog crown with 4 radial guide splines for push-button advance mechanisms | — |
|
Available Ink Formulations
|
Oil-based ballpoint (Parker QuinkFlow, Schmidt P900), hybrid low-viscosity (Uni Jetstream SXR-600), gel ink (Schneider Gelion+, Itoya) | — |
|
Pen Brand Compatibility
|
Parker, Pelikan, Faber-Castell, Rotring (600/800), Retro 51 Tornado, Tactile Turn, Karas Kustoms | — |
|
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) |