D1 Mini Refill vs. Parker G2 Refill
Comparing 2 standards across 11 specifications. 11 key differences identified.
The D1 Refill (standardized under ISO 12757-1 as Type D) is a standardized miniature metal-cased ballpoint/gel refill measuring exactly 67.0 mm in length and 2.35 mm in diameter. Friction-fit into internal selector sleeves, it is the universal standard for multi-function pens (3-in-1, 4-in-1), compact pocket pens, and precision stylus combinations.
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.
Specification Comparison Table
11 Parameters| Parameter / Spec | ||
|---|---|---|
|
Overall Length
|
67.0 ± 0.5 mm (2.64 in) | 98.1 ± 0.3 mm (3.86 in) |
|
ISO Standard Code
|
ISO 12757-1 Type D | ISO 12757-2 Type G2 (Documentary permanence proof) |
|
Outer Tube Diameter
|
2.35 ± 0.05 mm (0.093 in) | — |
|
Mounting Mechanism
|
Friction-fit slide sleeve (no threads or springs attached to refill body) | — |
|
Ink Varieties
|
Hybrid low-viscosity (Uni Jetstream SXR-200), Gel (Zebra JSB), standard ballpoint (Lamy M21, Schmidt 635) | — |
|
Benchmark Multi-Pens
|
Lamy 2000 4-Color, Rotring 600 3-in-1, Zebra Sharbo X, Kaweco Liliput ballpoint | — |
|
Main Body Diameter
|
— | 5.8 ± 0.1 mm (0.228 in) |
|
Stepped Tip Diameter
|
— | 2.5 mm extending 18.0 mm from barrel shoulder |
|
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 |