What Is M16 Bolt

M16 Bolt – Bolts are a familiar and crucial material in our lives, especially for those working in mechanical, repair, furniture, and related industries. Among the hundreds of bolt types with various designs, the most common one is the M16 bolt. Let's explore this type of bolt together with CTEG.

What does M16 Bolt mean?

The M16 bolt is a bolt with a nominal thread diameter of 16mm, although the actual measured thread diameter falls within the range of 15.68mm to 15.96mm. It features a coarse metric thread with a pitch (P) of 2mm, and precision grades according to standards such as DIN, ISO, GB are A and B. The mechanical properties of the bolt adhere to the ISO 898-1 standard, and it can have a plain/black finish or be electroplated, hot-dip galvanized, or Geomet-coated. 

The structure of the M16 bolt consists of two parts:

  • Bolt head: It can be flat, domed, or hexagonal.
  • Bolt body: It has a cylindrical shape with threads to securely fasten components, and this part determines the bolt's size variations.
  • The length of the bolt body can reach up to 300mm for continuous threads or 150mm for partial threads.

For example, the specifications of an M16x50 black grade 8.8 bolt For example, the specifications of an M16x50 black grade 8.8 bolt mean:

  • M16: Nominal thread diameter of 16mm, actual thread diameter between 15.68mm and 15.96mm.
  • 50: Length of the bolt is 50mm.
  • Coarse thread, metric system, thread pitch P = 2mm.
  • Thread tolerance 6g, product grade A.
  • 8.8: Strength grade, minimum tensile strength of 830 N/mm², yield strength of 640 N/mm².
  • Surface finishing: Plain black with a thin oil layer for protection.
  • Production standards: DIN 931/933, ISO 4014/4017, or ASTM A325M.

Therefore, the crucial specifications to be aware of for bolts include dimensions (bolt size and length) , strength grade, and finish. Other details like thread type, thread tolerance, and product grade are parameters known and provided by suppliers and manufacturers according to customer requirements. These specifications significantly impact the cost of the bolt.

M16 Bolts

Classification Methods for M16 Bolts

There are various methods for classifying M16 bolts, but the following are the two most commonly used approaches.

Classification Based on Production Standards

Bolts are produced according to various standards, and they primarily differ in the bolt head section. Based on the head section, they are categorized as follows:

  • Fully threaded bolts according to DIN 933/ISO 4017 standards
  • Partially threaded bolts according to DIN 931/ISO 4014 standards
  • Hexagon socket head bolts according to DIN 912/ISO 4762 standards
  • Button head hexagon socket bolts according to DIN 7380-1 standards 
  • Eye bolts according to DIN 444-B standards
  • Wing bolts according to DIN 316 standards

Classification Based on Manufacturing Materials

This is a common and almost universally applied method for classifying all types of bolts. Currently, there is a preference for using stainless steel bolts to resist corrosion. This includes:

  • Low carbon materials: typically used for bolts with strength grades 4.6, 5.8
  • Medium carbon materials: commonly used for bolts with strength grades 6.6, 8.8
  • Alloy materials: often used for bolts with strength grades 10.9, 12.9
  • Stainless steel materials: SS 201/304/316/410
  • Materials such as copper, aluminum, nickel, or titanium.

Additionally, M16 bolts can be manufactured from various steel grades with different strength levels. In practice, plastic bolts can also be observed for connecting simple devices.

M16 Bolts

The characteristics of M16 bolts are as follows:

M16 bolts are a type of bolt designed according to standardized dimensions and common patterns. They are produced in quantities sufficient to supply industrial and construction projects. M16 bolts have the following notable features:

  • The primary material used to manufacture M16 bolts is typically C45 steel, which has a medium carbon content. Alternatively, they may be made from CT3 steel, a low-carbon steel type.
  • All products are manufactured according to DIN standards, and the surface of the bolts can be either raw or electroplated with zinc.
  • In terms of strength grades, bolts made from CT3 steel have strength grades of 4.6 and 5.8, while those processed from C45 steel have strength grades of 8.8 and 10.9.
  • The size of the bolts ranges from 40 to 300 millimeters.

Benefits of choosing the right size of bolts for use:

There are many cases where bolts are purchased, but the correct size is not chosen. In such cases, the connection and joints may not be secure, leading to vibrations, damage, or failure under strong impacts. Choosing the right size bolt offers the following benefits:

  • It facilitates quick and precise assembly of joints.
  • When the appropriate bolt is selected, it can easily withstand various loads and forces, providing stability and durability to the material. It ensures efficient operation of machinery and equipment over an extended period, ensuring maximum safety.

Applications of M16 Bolts:

Like other types of bolts, M16 connecting bolts are widely used in various fields. M16 bolts are categorized into two types, each used for different purposes:

  • M16 Connecting Bolts: As the name suggests, M16 connecting bolts are used to join and connect edges together. These bolts provide static connection and play a load-bearing role in construction projects, mechanical assembly, with common standards like DIN 931/933, ISO 4014/4017.
  • The M16 bolt : These bolts play a load-bearing role in concrete structures, foundation piles, and structures that need to withstand both vertical and shear forces in construction. Therefore, these bolts must have high strength levels, following common manufacturing standards like ASTM A325M or ISO 7412.

These are all the relevant details about M16 bolts that CTEG wants to share. If you are looking for a supplier of M16 bolts specifically or other types of bolts in general, please contact us through the following: 

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Cuong Thinh Company (abbreviated CTEG) is a leading provider of bolts and screws, manufacturing, importing, and distributing wholesale and retail products to businesses, factories... in a variety of fields and industries.

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