Understanding M2 Button Screw Hex Size Requirements

M2 button screws are small and discrete, making them ideal for projects that require compact fastening solutions. These screws are part of the ISO metric screw standard and feature a hexagonal socket drive, also known as Allen or hex key drives. The M2 designation refers to the diameter of the screw, typically measured in millimetres. M2 button screws are commonly available in various lengths to accommodate different application requirements. They are often made from steel, including alloy steel and stainless steel, and can be coated with thermal black oxide for enhanced properties.

M2 Button Head Hex Socket Screws are available in stainless steel

The M2 x 3mm Socket Button Screws (ISO 7380-1) are one such example, made from stainless steel (A2). These screws have a head diameter of 3.5mm, a head length of 1.3mm, and a socket size of 1.3mm. The socket depth is a minimum of 0.8mm, and the screw thread pitch is 0.4mm. These screws are available in a range of materials, including stainless steel, with additional features such as thread-locking patches or chemical blackening.

M2 Button Head Hex Socket Screws are also available in full thread stainless steel, with lengths of 4mm, 6mm, and 10mm. These screws are perfect for mounting PCBs with small holes, such as the raspberry pi, to 3D-printed items. They are also suitable for replacing small screws in items like Runcam cameras.

M2 Button Head Hex Socket Screws in stainless steel can be purchased from various online retailers and are often available in larger packs at a discounted rate per piece.

M2 Button Head Socket Cap Screws are coated in thermal black oxide

The black oxide coating provides a basic level of protection against corrosion and abrasion, but it is important to note that black oxide-treated screws can still rust in certain environments. To enhance the corrosion resistance of M2 Button Head Socket Cap Screws, the black oxide coating is typically applied in combination with oil or wax. This additional layer of protection helps to further guard against rusting and improves the overall appearance of the screws.

The process of applying thermal black oxide to M2 Button Head Socket Cap Screws involves dipping the screws into different chemicals, followed by water, and then applying an extra layer of oil. This process, known as the hot process, utilizes heated chemicals to convert the surface of the screws into magnetite, a stronger form of iron oxide that provides enhanced protection.

M2 Button Head Socket Cap Screws with thermal black oxide coating are commonly used in applications where corrosion resistance, dimensional stability, and lubricity are important. They are often used in controlled environments, such as machine tools and fixtures, where regular maintenance and oiling are performed. The black oxide coating helps to absorb and hold onto the oil, providing a higher level of protection than uncoated screws.

In summary, M2 Button Head Socket Cap Screws are coated in thermal black oxide to enhance their visual appeal, protect against corrosion and debris, and improve their performance in tight-tolerance applications. The black oxide coating, combined with oil or wax, provides a basic level of protection against corrosion and abrasion, making these screws suitable for a wide range of applications.

Hex Socket Button Head Cap Screws are made from 4137 alloy steel

The use of 4137 alloy steel in the manufacturing of Hex Socket Button Head Cap Screws ensures superior performance and durability. The screws are often coated with thermal black oxide, providing additional protection and enhancing their aesthetic appeal.

One of the key advantages of 4137 alloy steel is its composition, which includes comparatively high amounts of chromium (Cr) and manganese (Mn). Chromium improves corrosion resistance and enhances most mechanical properties, particularly at higher temperatures. Manganese, on the other hand, improves hardenability, hot workability, and surface quality, resulting in a stronger and more reliable screw.

The mechanical properties of 4137 alloy steel are impressive. It exhibits a tensile strength of 550 MPa and a yield strength of 340 MPa. Additionally, the material has good thermal conductivity, with a value of 45 W/m-K, and a specific heat capacity of 470 J/kg-K. These properties contribute to the screw's ability to withstand high-stress applications and maintain its structural integrity.

In summary, Hex Socket Button Head Cap Screws made from 4137 alloy steel offer a combination of strength, durability, and workability. The addition of chromium and manganese enhances the material's performance, making these screws suitable for a wide range of applications, especially in the field of electronics and 3D printing.

M2 screws are small and discrete

M2 screws are available in a range of materials, including steel, stainless steel, brass, nylon, aluminium, and titanium, as well as exotic materials such as Duplex, Super Duplex, and Inconel. They come in a variety of head styles, such as socket head cap screws, flat head machine screws, and pan head machine screws. M2 screws are typically sold in kits or packs that include a variety of lengths, such as 4mm, 6mm, 8mm, 10mm, and 12mm.

When purchasing M2 screws, it is important to consider the drive type and material grade. The drive type refers to the shape of the screw head and the corresponding tool required to tighten or loosen it. Common drive types for M2 screws include Phillips and hex socket (also known as Allen key or Allen hex drive). The material grade indicates the strength and quality of the screw, with higher numbers denoting higher strength. For example, a grade of 12.9 is stronger than a grade of 12.8.

M2 screws are often used in applications where small, discrete fasteners are required, such as in electronics and computing. They can also be used for 3D printing and other DIY projects. When selecting M2 screws, it is important to consider the specific application and choose the appropriate material, head style, and length to ensure a secure and functional fastening.

M2 is an ISO metric screw size

The ISO metric screw thread is the most commonly used type of general-purpose screw thread worldwide. The design principles of ISO general-purpose metric screw threads ("M" series threads) are defined in international standard ISO 68-1. Each thread is characterised by its major diameter, D (Dmaj in the diagram), and its pitch, P. ISO metric threads consist of a symmetric V-shaped thread. In the plane of the thread axis, the flanks of the V have an angle of 60° to each other. The thread depth is 0.54125 × pitch.

The ISO 724 standard specifies basic dimensions of metric threads in accordance with ISO 261. Dimensions refer to the basic profile in accordance with ISO 68. The pitch varies from coarse to extra fine, with up to 5 different pitches for some dimensions. The thread angle is 60° and the thread depth is 0.614 x pitch.

M2 Button Head Hex Socket Screws are available in stainless steel, with a full thread and in lengths of 4mm, 6mm and 10mm. M2 Button Head Socket Cap screws are also available in 12.9 alloy steel with a thermal black oxide coating.

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