Bs En Iso 128-20 Pdf Jun 2026

BS EN ISO 128-20 is a British Standard (BS) and International Organization for Standardization (ISO) standard that outlines the requirements for technical drawings. Specifically, it focuses on the representation of objects on technical drawings, including their shapes, sizes, and tolerances. The standard is part of the ISO 128 series, which provides general principles for technical drawing.

BS EN ISO 128-20 is the British Standard adoption of the European Standard (EN) which is identical to the International Standard ISO 128-20. The full title of the document is typically cited as Technical product documentation — General principles of presentation — Part 20: Basic conventions for lines. bs en iso 128-20 pdf