CAD Standards have been created to improve productivity and interchange of Computer-aided design documents between different offices and CAD programs, especially in architecture and engineering.
AEC (Architecture Engineering and Construction) standards 
CAD layer standards 
- BS-1192, which relies heavily on the Code of Procedure for the Construction Industry
- AIA Cad Layer Guidelines, 2nd edition (1997), has a great usage in the USA;
- ISO 13567-1/3, International standard, common in Northern Europe;
- AEC (UK), an adaptation of BS-1192 based on Uniclass.
- A/E/C CAD Standard, Tri-service (USACE/Air Force/NAVFAC) CAD standard created/maintained by the CAD/BIM Technology Center for Facilities, Infrastructure, and Environment..]
- SIA 2014 (1996), Swiss standard for engineers and architects, based on ISO 13567.
- ÖNORM A 6240-4 (2012), Austrian standard for digital documentation in technical drawings, based on ISO 13567.
Samples of standardised layers:
- A-B374--E- (ISO13567: agent Architect, element Roof window in SfB, presentation graphic element);
- A-37420-T2N01B113B23pro (ISO13567: agent Architect, element Roof Window in SfB, presentation Text#2, New part, floor 01, block B1, phase 1, projection 3D, scale 1:5(B), work package 23 and user definition "pro");
- A-G25---D-R (ISO13567: agent Architect, element wall in Uniclass, presentation dimensions, status Existing to be removed);
- A-G251-G-WallExtl-Fwd (AEC(UK): agent Architect, element External Wall in Uniclass, presentation graphic element, user definition "WallExtl" and view Forward);
- A210_M_ExtWall (BS1192: agent Architect, element External Wall in SfB, presentation model, user definition "ExtWall");
- A-E04---E- (ISO13567 SIA 2014: agent Architect, element Stair in SIA classification, presentation graphic element);
- A-WALL-FULL (AIA: agent Architect, element Wall, Full height).
Thickness for pens and plot: 0,13 mm Gray, 0,18 mm Red, 0,25 mm White, 0,35 mm Yellow, 0,50 mm Magenta, 0,70 mm Blue, 1,00 mm Green. In AutoCAD usually parts to be printed in black are drawn in 1 to 7 basic colors. Color layer: Green-Center, Magenta-Measure of length and Blue-Hidden.
|Description||Line thickness in mm||Color Codes|
|Out Line||0.20 or 0.25||White, Cyan, Yellow,Blue|
|Hidden Line||0.00 or 0.05||Blue, Gray, 241|
|Center Line||0.10 or 0.15||Green, Red|
|Note||0.18 or 0.20||Cyan, Green, 41|
|Thin Line||0.00 or 0.05||Gray, 08, 111|
|Reference Line||0.000||Magenta, Gray|
|Hatch Line||0.000||Magenta, Green, Gray,red|
|Color-9 to 256||0.000|
|Leader Line with Arrows||0.000||Gray Color-9,or 8, Red|
|Text||0.18 or 0.20||Cyan, Green,|
Text and dimension 
Heights: 1,8 mm, 2,5 mm, 3,5 mm, 5,0 mm, 7,0 mm (relative thickness are 1/10 of the heights). Font styles: "Romans", "ISO CP". Exceptional use of true type fonts (arial, Times New Roman etc.).
1:1, 1:10, 1:100 .... 1:2, 1:20, 1:200 .... 1:5, 1:50, 1:500 .... s
File naming standards 
Discipline (1 char), Element (2 char, using SfB Table 1 or Uniclass), Drawing type (1 char, P=preliminary, X=special/xref, L=layout, C=component, S=schedules, A=assembly drawings, K=co-ordination drawing), Unique number (3 char), Revision (1 char, A=emission, B,C,D...= revisions). Samples: A22P012G.dwg (architect, internal walls in SfB, preliminary design, sheet 012, revision G).
Samples: ZE1G-124.dwg, XE1G-100.dwg
- AEC (UK)
Project (unlimited char), Discipline (2 char max, recommended mandatory), Zone (optional), View (1 char, rec.mand.), Level (2 char, rec.mand.), Content (rec.mand.), Sequential number (up to 3 char); Samples: 1234-A-Off-P-M1-Furn-11c.dwg (project #1234, architect, office zone, plan, mezzanine 1, furnitures, version 1.1 revision c) , A-P-01-Part (architect, plan, 1st floor, partitions), 1234-A-S-055.dgn (project #1234, architect, section, sheet 055), A-S-xx-AA.dwg (architect, section, full building, section AA), A-P-x-Grid.dgn (architect, plan, all floor, grid), 1838-S-C-P-03 (project 1838, structures, building C, plan, 3rd floor).
- Other local:
Job number (4 char), Agent (1 char), Section (4 char), phase (1 char), sheet number (2 char), revision (2 char) Samples: 0512-A-00A_-1-01-02.dwg Job number (3 char), View (2 char), section (2char), phase (1 char), revision (1 char) Samples: 123p0s2d0.dwg (job 1239, plan, 2nd floor, definitive drawing, emission), 459s0BBD0.dgn (job 123, section B, definitive drawing, emission).
MCAD (Mechanical) standards 
Geometric Dimensioning and Tolerancing 
Industry standards for defining Product Manufacturing Information (PMI), a 3D extension of Geometric Dimensioning and Tolerancing (GD&T), include ASME Y14.41-2003 Product Data Definition and ISO 1101 Representation of specifications in the form of a 3D model.
Geometry quality 
Product Data Quality 
PDQ is a field of PLM relating to the quality of product data, particularly the geometrical and organizational quality of CAD data. Checkers, software that analyze CAD data formats, are often employed before and after data translation. The checkers can check the organization and quality of the data against internal company standards and international or industry standards. These checkers can be built into specific CAD packages or work on a number of CAD file formats.
In 2006/2007 Part 59 of STEP ISO 10303-59 Product data representation and exchange: Integrated generic resource: Quality of product shape data is under development. It defines how to represent quality criteria together with measurement requirements and representation of inspection results.
See also 
- Model based definition
- Construction Project Information Committee
- ISO Standards Handbook - Technical drawings, a broad collection of all basic ISO drawing standards
- ISO 128 Technical drawings—General principles of presentation
- ISO 13567 Technical product documentation - Organization and naming of layers for CAD
- ISO 16792 Technical product documentation — Digital product definition data practices, for the presentation of 3D models and GD&T
- ASTM F2915 Additive Manufacturing File Format
- IGES Initial Graphics Exchange Specification
- Kiziltas, S.; Leite, F.; Akinci, F.; Lipman, R. (2009) “Interoperable Methodologies and Techniques in CAD”. Chapter 4. In: CAD and GIS Integration. Karimi, H.; Akinci, B. (ed.). Taylor & Francis. p. 73-110.
- A/E/C CADD Standard R4.0 July 2009.
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