TS ISO 9177-3
Mechanical pencils for technical drawings - Part 3: Black leads - Bending strengths of HB leads
This document specifies bending strengths and a test method for black leads of HB hardness degree used for mechanical pencils for technical drawings.
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About This Item
TS ISO 9177-3 addresses the bending strength of HB black leads used in mechanical pencils for technical drawings, together with the test method used to determine it. The standard provides a common technical basis for assessing how these leads behave against breakage during use, especially in drafting applications where line consistency matters.
The role of HB leads in technical drawing
HB is a familiar hardness grade for pencil leads, balancing darkness and hardness. In technical drawing, this grade is often chosen because it can produce legible lines while still offering controlled mark-making. Lead bending strength is important because the slender graphite core advanced by a mechanical pencil must withstand everyday handling and writing pressures; fragile leads interrupt drafting work and increase waste.
What this standard covers
- Bending strength values for HB black leads
- A test method for determining that strength
- Leads intended for mechanical pencils used in technical drawing
In general technical terms, bending strength describes a material’s resistance to cracking or breaking under bending loads. For leads, this property is one of the practical indicators of product quality, drafting reliability, and user convenience. By standardizing the measurement approach, TS ISO 9177-3 helps make HB lead performance easier to compare across products.
- Publication Date: 2.03.2022
- Standard Status: U (Yürürlükteki Standard/Standard)
- Publisher: TSE
- Document Language: en
- ICS Classification: 01.100.40 Çizim Ekipmanları; 97.180 Çeşitli Ev Ekipmanları,
- Pages: 15
- Source Standard: ISO 9177-3:2022
- International Equivalents: ISO 9177-3-EQV
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