DIN 939

DIN DIN 939 is a technical specification from the Deutsches Institut für Normung (DIN), which is the German Institute for Standardization. The specification defines the characteristics of partially threaded hexagon head bolts made of steel with a tensile strength of 800 N/mm² or higher.

Uses of DIN 939

Specifically, DIN 939 bolts have a partially threaded shank, with a length that is typically equal to 1.25 of the nominal diameter of the bolt. The unthreaded portion of the shank is designed to be inserted into a hole in a mating part, and the threaded portion of the shank extends through the other side of the hole, where a nut can be fastened.

DIN 939 bolts are commonly used in various applications where a high level of clamping force is required, such as in machinery and construction. Some specific uses of DIN 939 bolts include:

1. Connecting heavy-duty machinery: DIN 939 bolts are commonly used to connect heavy machinery components together. Their high tensile strength and partially threaded shank allow them to provide a secure connection and withstand heavy loads.
2. Construction: DIN 939 bolts are used in the construction of buildings, bridges, and other large structures. They are often used to connect steel beams and other structural components together.
3. Automotive applications: DIN 939 bolts are used in the automotive industry for various applications, such as in engine components and suspension systems.
4. Aerospace applications: DIN 939 bolts are used in aerospace applications where high strength and reliability are required. They are commonly used in the assembly of aircraft engines, landing gear, and other critical components.

Overall, DIN 939 bolts are used in a wide range of applications where a high level of clamping force and reliability are required. The specification provides a standard for the dimensions, materials, and testing requirements for these bolts, ensuring their consistent quality and performance.

Materials for DIN 939

DIN 939 partially threaded studs are available in a variety of materials to suit different applications and environments. Some of the most common materials used for DIN 939 studs include:

Steel A4: DIN 939 studs made from steel A4 are also known as stainless steel 316 studs. This material has excellent corrosion resistance and is suitable for use in harsh environments, such as marine or chemical applications.

Steel A4-70: DIN 939 studs made from steel A4-70 have a minimum tensile strength of 700 N/mm² and are often used in high-stress applications where strength is critical.

Steel 316: DIN 939 studs made from steel 316 are similar to steel A4 studs and have excellent corrosion resistance, making them suitable for use in harsh environments.

Steel 8.8: DIN 939 studs made from steel 8.8 have a minimum tensile strength of 800 N/mm² and are commonly used in construction and engineering applications.

Steel 10.9: DIN 939 studs made from steel 10.9 have a minimum tensile strength of 1000 N/mm² and are suitable for use in high-stress applications such as automotive and aerospace.

Brass: Brass studs are commonly used in electrical and electronic applications due to their excellent electrical conductivity and resistance to corrosion.

Brass CW614N: DIN 939 studs made from brass CW614N are also known as dezincification-resistant brass. This material has good corrosion resistance and is often used in plumbing and water supply applications.

Brass CW617N: DIN 939 studs made from brass CW617N are also known as high-performance brass. This material has excellent corrosion resistance and is often used in electrical and electronic applications.

Brass CZ121: DIN 939 studs made from brass CZ121 have good machinability and are often used in low-stress applications, such as automotive and plumbing.

Aluminum: Aluminum studs are lightweight and have good corrosion resistance, making them suitable for use in marine and other corrosive environments.

Titanium: Titanium studs are strong, lightweight, and have excellent corrosion resistance. They are commonly used in aerospace and marine applications.

Aluminum 2011-T3: DIN 939 studs made from aluminum 2011-T3 are often used in applications that require high strength and good machinability. This material has good corrosion resistance and is often used in aerospace and automotive applications.

Aluminum 2024-T4: DIN 939 studs made from aluminum 2024-T4 have high strength and good fatigue resistance. This material is often used in aerospace and other high-performance applications.

Aluminum 6061-T6: DIN 939 studs made from aluminum 6061-T6 have good corrosion resistance and are often used in marine and other corrosive environments. This material is also commonly used in structural and architectural applications.

Other materials: DIN 939 studs are also available in other materials such as copper, bronze, and plastic, depending on the specific application requirements.

Titanium Grade 2: DIN 939 studs made from titanium Grade 2 have good strength and excellent corrosion resistance, especially in acidic environments. This material is often used in chemical and marine applications.

Titanium Grade 5: DIN 939 studs made from titanium Grade 5 have high strength and excellent corrosion resistance, making them suitable for use in aerospace and other high-performance applications.

Titanium Grade 7: DIN 939 studs made from titanium Grade 7 have good corrosion resistance and are often used in chemical and marine applications.

Copper: DIN 939 studs made from copper have good thermal and electrical conductivity, making them suitable for use in electrical and electronic applications.

Bronze: DIN 939 studs made from bronze have good wear resistance and are often used in machinery and equipment.

Inconel: DIN 939 studs made from Inconel have excellent high-temperature strength and are often used in aerospace and other high-performance applications.

Monel: DIN 939 studs made from Monel have excellent corrosion resistance and are often used in marine and chemical applications.

Alloy Steels:

Carbon steel: DIN 939 studs can be made from carbon steel alloys such as C1010, C1020, and C1035. These alloys are often used in general-purpose applications where strength and durability are important.

Alloy steel: DIN 939 studs can also be made from alloy steel alloys such as 4140, 4340, and 8620. These alloys are often used in high-stress applications that require high strength, wear resistance, and/or heat resistance.

Stainless steel: DIN 939 studs can be made from various grades of stainless steel such as 304, 316, and 410. These alloys are often used in applications that require resistance to corrosion and/or high temperatures.

Titanium: DIN 939 studs can be made from titanium alloys such as Grade 5 (Ti-6Al-4V). These alloys are often used in aerospace and other high-performance applications where strength, corrosion resistance, and/or light weight are important.

DIN 938 vs DIN 939

DIN 938 and DIN 939 are both standards for metric fully threaded studs, but they have some key differences in their specifications. Here are some of the main differences between DIN 938 and DIN 939:

1. Length: The length requirements for DIN 938 and DIN 939 are different. DIN 938 specifies the length of the threaded portion of the stud to be equal to the diameter of the thread, while DIN 939 specifies the length to be equal to 1.25 times the diameter of the thread.
2. End type: The end type for DIN 938 and DIN 939 studs is different. DIN 938 studs have chamfered ends, while DIN 939 studs have pointed ends.
3. Material: DIN 938 and DIN 939 studs can be made from different materials. DIN 938 studs are typically made from steel, while DIN 939 studs are typically made from stainless steel.
4. Tolerance: The tolerance requirements for DIN 938 and DIN 939 are different. DIN 938 studs have a tighter tolerance for the length of the threaded portion compared to DIN 939 studs.
5. Application: DIN 938 studs are commonly used in applications where a partially threaded stud is needed, while DIN 939 studs are commonly used in applications where a fully threaded stud with a pointed end is needed, such as in applications where the stud is used to locate and align two parts.

It's important to note that the exact specifications and requirements for DIN 938 and DIN 939 studs can vary depending on the manufacturer and the specific application requirements. It's always a good idea to consult with a qualified engineer or supplier to ensure that the stud selected is appropriate for the specific application.