Release time：2020-01-16 18:44 Browse：
Here is a point - by - point description of 12.9 - class high - strength fasteners including cylindrical - head hexagon machine screws, cup - head screws, and full - tooth/half - tooth knurled screws: ### Cylindrical - Head Hexagon Machine Screws - **High Strength** - Belonging to the 12.9 - class, these screws offer excellent tensile and shear strength, making them suitable for applications requiring high - strength connections. They can withstand heavy loads and are often used in machinery and equipment manufacturing. - **Cylindrical - Head Design** - The cylindrical - head shape provides a relatively flat and smooth surface, which is beneficial in applications where a flush or semi - flush appearance is desired. It also offers a certain bearing area to distribute the load evenly when tightened. - **Hexagon Head** - The hexagon head allows for easy gripping and torque application using standard wrenches or sockets. This design enables efficient installation and removal, facilitating maintenance and repair work. ### Cup - Head Screws - **Unique Head Shape** - The cup - head design has a concave - shaped top, which can provide a self - centering function in some applications. It helps to ensure accurate alignment of the screw during installation, especially in applications where precise positioning is crucial. - **Full - Tooth and Half - Tooth Options** - Cup - head screws are available in both full - tooth and half - tooth versions. Full - tooth screws have threads along the entire length of the shank, providing maximum engagement and strength for applications requiring a secure and tight connection. Half - tooth screws, on the other hand, have threads only on a portion of the shank. This design can be useful in applications where partial thread engagement is sufficient, or where a combination of threaded and unthreaded portions is needed for specific assembly requirements. - **High - Strength Performance** - As 12.9 - class fasteners, cup - head screws possess high - strength characteristics. They can effectively transmit forces and maintain the integrity of the connection in various mechanical and structural applications. ### Knurled Screws - **Knurled Surface** - The knurled screws have a textured surface on the shank, which provides better grip and resistance to rotation. This is particularly useful in applications where the screw needs to be tightened or adjusted by hand, as the knurling allows for a more secure hold and easier manipulation. - **Full - Tooth and Half - Tooth Variants** - Similar to cup - head screws, knurled screws are also available in full - tooth and half - tooth configurations. The choice between the two depends on the specific requirements of the application, such as the desired level of thread engagement and the nature of the materials being joined. - **Versatile Applications** - Due to their unique features, knurled screws are often used in applications where a combination of high strength, good grip, and adjustable fastening is required. They can be found in various industries, including electronics, furniture, and automotive, for tasks such as assembling components, adjusting positions, and securing parts.
