As a design engineer, you must at least know the following few national and international codes and standards of mechanical engineering, if not more:

**ASME Y 14.5**

American Society of Mechanical Engineer or ASME Y 14.5 is most widely accepted Geometrical Dimensioning and *Tolerancing* (GD&T) standard code for the mechanical engineering professionals and students.

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**When to use this standard?**

Specifying GD&T symbols and values in drawing.

Interpreting drawings with GD&T.

**Which are the other standard equivalent to this?**

ISO 1101 (partial)

**ISO 286**

This standard guides about limits and fits for machine parts.

When to use this standard?

This standard will be required to read the drawings with tolerance fundamental deviation classes and standard deviation (IT) classes mentioned in it.

Which are the other standard equivalent to this?

BS EN 20286 (partial)

**ANSI/ASME B4.1 and B4.2**

ASME B4.1 and 4.2 talk about preferred limits and fits between holes and shafts.

**When to use this standard?**

While designing or specifying the diameters of mating shafts and holes you will need these standards to select the correct standard deviation symbols (e.g. h,g etc) and IT grades (5,6 ..) based on the kind of fits (like sliding fits, clearance fits, interference fits) you want.

**Which are the other standard equivalent to this?**

BS4500/ BS EN20286

ISO 1829

JIS G3 123

DIN 668

59360.1

NF A47-411

BS 4500

UNI 468, 469

UNI 5953

AS 1654

**JIS D1601**

It describes the various vibration testing methods required to validate the automobile components.

**When to use this standard?**

When you know the type and class of the automobile component but donâ€™t know the exact vibration characteristics it needs to be tested for. This standard, in such cases, will give you the approximate input vibration parameters required for testing.

**BS 5760**

It describes the tools and techniques related to reliability of systems, equipments and components.

**When to use this standard?**

You will need this standard for doing reliability calculations and using the available reliability tools (like: DFMEA, FMECA) while designing.

**Which are the other standard equivalent to this?**

Def Stan 00-42 (Partial)

**AWS A 2.4**

Talks about drawing symbols for welding, soldering and braizing.

**When to use this standard?**

While designing the welded / soldered/ brazed components, you will use this standard for showing correct welding symbols in drawings.

**Which are the other standard equivalents to this?**

BS EN 22553

ISO 2553