METRIC THREADING


Metric threading is one of the most commonly used threading systems worldwide, standardized according to the international metric system. This type of threading is defined by ISO 68-1 and is characterized by a "V" profile with a 60-degree angle.


Characteristics of Metric Threading


Profile Geometry


The profile of metric threading has a "V" shape with a 60-degree angle. This type of threading is identified by two main parameters: the nominal diameter (d) and the pitch (P).


Main Parameters

Parameter Symbol Description
Nominal Diameter d External diameter of the thread
Pitch P Distance between two consecutive crests
Internal Diameter d1 Root diameter of the thread
Core Diameter d2 Diameter at the bottom of the groove

Standard Size Tables


Metric threading is divided into two main categories: coarse metric threading (M) and fine metric threading (MF).


Table 1: Standard Sizes for Coarse Metric Threading

Nominal Diameter (mm) Pitch (mm) Internal Diameter (mm) Core Diameter (mm)
M4 0.7 3.3 2.75
M5 0.8 4.3 3.65
M6 1.0 5.2 4.48
M8 1.25 6.8 5.94
M10 1.5 8.4 7.3

Advantages of Metric Threading


Metric threading offers several advantages, including:

  • Uniformity and Standardization: ISO 68-1 ensures global standardization, facilitating interchangeability.
  • Versatility: Suitable for a wide range of industrial applications.
  • Precision: The "V" profile ensures an even load distribution.


Applications


Metric threading is widely used in various sectors, including:

  • Automotive: Engine components, suspension systems.
  • Construction: Steel structures, installations.
  • Electronics: Component assembly, fastenings.


Conclusion


Metric threading represents an efficient and standardized solution for fastening and connection needs across multiple industrial sectors. Due to its global adoption and ease of use, it has become an essential element in mechanical and engineering applications.

Autore: Alice Libardi 31 luglio 2025
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