General Hatch Patterns Used In Technical Drawings

Technical drawing is a very important language between people dealing with the same professional area. They are generally obtained by experts in a specific area to show the critical details about the products and manufacturing techniques. All the people around the world must understand technical drawing. 

So, technical drawings have standards to comply with. You need to obtain your technical drawings according to these standards. 

Technical Drawing with Engineering Graphics

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Also in mechanical engineering, you must comply with all the standardizations for technical drawings. These standards are generally defined by ASME and ISO. A good technical drawing must include all the details, dimensions, tolerances, and manufacturing techniques that must be used to produce this product or part. 

Section-Lining In Technical Drawings

Image Source: FREDERICK E. GIESECKE, SHAWNA LOCKHART, Technical Drawing With Engineering Graphics 15th Ed., Pearson, Pg.335

We explained the section linings to obtain a more detailed and easy-to-show structure on technical drawing sheets. Also, we mentioned showing section cut section with a proper hatch pattern. In this article, we will show you what kinds of hatch patterns must be used in technical drawing section cuts. 

Rules Of Section Line Hatching In Mechanical Engineering Drawings

The generally adopted standard for the hatch patterns for mechanical engineering technical drawings are like this; 

  • 45 degrees of angle is generally used for hatch pattern inclination. But if the inclination of hatchings coincides with part’s boundaries and lines, other angles can be used such as 30 degrees or 60 degrees. 
  • The spacing between the hatching lines must be in specific standards. For most technical drawings, 2.5 mm(0.1 in) is used. But if the technical drawing is too large, 3 mm(1/8 in) or more can be used. Or if the technical drawing includes very small parts, the spacing can be 1.5 mm(1/16 in) or below. 
  • According to the line standards that you are using in your technical drawing documentation, you need to use thin lines for your hatch pattern lines.

Take Care About Dimension Lines!

When you are showing your technical drawing dimensions, you need to take care not to overlap the dimension lines and hatch pattern. The dimension lines must lie outside of the hatch pattern. 

General Hatch Patterns For Different Parts

In industry, generally, metal parts are explained in technical drawing documentations. But it will be very good for the comply with the standardizations. You can see the general hatch patterns that are used for different materials, in technical drawings. 

Image Source: FREDERICK E. GIESECKE, SHAWNA LOCKHART, Technical Drawing With Engineering Graphics 15th Ed., Pearson, Pg.336


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