Technical Drawing Standards: Lettering Heights

9.047 FANS

The BS Standards defines a range of eight Nominal heights for lettering.

The sizes are:

1.8, 2.5, 3.5, 5.0,7.0,10,14 and 20mm

A formula of 1:√2 (≈ 1:1.4) is used to calculate the sizes available,the same formula that calculates paper sizes and line weights.

The recommended Minimum sizes are:

Paper size Notes & Dims Titles Headings
A0 3.5 5 7
A1 2.5 3.5 5
A2 2.5 3.5 5
A3 2.5 3.5 5
A4 1.8 2.5 3.5

BS EN ISO 3098-0:1998 Technical product documentation. Lettering. General requirements.

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