GB/T 39645-2020
Technical drawings—Symbols for geometrical tolerancing proportions and dimensions

Standard No.

GB/T 39645-2020

Language

Chinese

Release Date

2020

Published By

国家市场监督管理总局、中国国家标准化管理委员会

Lastest

GB/T 39645-2020

Scope

This standard specifies the recommended form, proportion and size of symbols used to mark geometric tolerances on product technical drawings and product technical documents. This standard applies to various drawing methods such as computer, manual, template, and drawing. The size of these symbols is based on the standard font height given in GB/T14691.

GB/T 39645-2020 Referenced Document

• GB/T 1182-2018 Geometrical product specifications(GPS)—Geometrical tolerancing—Tolerances of form, orientation, location and run-out
• GB/T 14691 Technical drawings--Lettering
• GB/T 14691-1993 Technical drawings--Lettering
• ISO 3098-1:1974 Technical drawings; Lettering; Part I : Currently used characters

GB/T 39645-2020 history

• 2020 GB/T 39645-2020 Technical drawings—Symbols for geometrical tolerancing proportions and dimensions