

Pentel Ain STEIN Mechanical Pencil Refills (0.3mm)
In design, technical drawing, and daily office documentation, selecting mechanical pencil refills plays an essential role in ensuring precision and visual clarity. The Pentel Ain STEIN mechanical pencil refills in a 0.3mm lead size from the Japanese brand Pentel provide a quality stationery supply, offering durability, clear lead density, and break resistance for corporate clients, factories, and professional design departments.
Overview of Pentel Ain STEIN Mechanical Pencil Refills (0.3mm)
Pentel is a recognized global brand in mechanical pencils and lead refills. The Pentel Ain STEIN refill series is engineered with a specialized ceramic frame structure that reinforces the internal graphite particles. This structure provides high mechanical strength, minimizing lead breakage during continuous pressure or sketching.
The 0.3mm lead size is well-suited for tasks requiring high precision, such as technical drawing, graphic drafting, architectural sketching, and recording detailed parameters on business documents.
Detailed Technical Specifications
Below is the technical specification table designed for B2B procurement teams:
| Item Code | Lead Grade | Lead Size | Order Code | Unit |
|---|---|---|---|---|
| C273 | HB | 0.3 mm | 037921 | Tube / 15 leads |
| C273 | 2B | 0.3 mm | 037764 | Tube / 15 leads |
Key Highlights of Pentel Ain STEIN Mechanical Pencil Refills (0.3mm)
1. Ceramic Frame Structure for Reduced Lead Breakage
Unlike standard lead refills, Pentel Ain STEIN utilizes a ceramic frame structure that secures the internal graphite particles. This enhances structural strength, reducing breakage when drawing fine lines or applying writing pressure.
2. Sharp Lines and Smooth Lead Flow
With HB and 2B hardness options, the product provides accurate, clear lead density without smudging on paper or hands. The lead glides smoothly across various paper types, supporting rapid and continuous writing.
3. Practical Tube Design for Convenient Storage
The Pentel Ain STEIN lead tube features a smooth swivel cap mechanism, allowing easy retrieval of individual leads while keeping the remaining leads secure. Its compact case fits conveniently into pencil cases, desk drawers, or technical toolkits.
Business and Industrial Applications
- Engineering & Design Departments: The 0.3mm line size is a practical choice for architects and engineers drafting schematics, CAD drawings, or detailed machine components requiring precision.
- Corporate Offices: Suitable for recording fine-text notes, creating charts, or taking daily meeting logs.
- Factories & Quality Control (QC) Units: Supports inspection personnel in recording technical specifications and marking material details clearly.
Frequently Asked Questions (FAQ)
1. Are Pentel Ain STEIN 0.3mm lead refills compatible with mechanical pencils from other brands?
Yes. The 0.3mm lead refills are compatible with standard mechanical pencils designed for 0.3mm lead sizes.
2. What is the difference between HB and 2B lead grades?
The HB grade provides balanced lead hardness and darkness suitable for general writing. The 2B grade delivers a darker, softer stroke ideal for drafting or bold marking.
3. How can corporate clients place bulk orders for these lead refills?
B2B clients can provide the corresponding Order Code (037921 for HB or 037764 for 2B) to the support team at Nhanh Nhanh to receive wholesale quotes and direct delivery assistance.




















