A screw is a cylindrical metal component with spiral-shaped grooves. Its basic function is to act as a male thread, while a female thread in the form of a nut or a component is used in conjunction with the male thread to secure parts together.
Screws come in various types, depending on factors such as the shape of the thread, diameter, length, and pitch, and they are utilized for a wide range of applications.
Commonly, they are used in machinery, automobiles, buildings, household appliances, and various other products.

A bolt is a cylindrical metal component with threaded grooves that is used in conjunction with a nut to secure two parts together.
Bolts come in different types based on factors such as the shape of the threads, diameter, and length, and they are used for various applications.
There are different head shapes available, including hexagonal, flanged, and flat heads, each suitable for different fastening methods.
Bolts are also classified based on their materials, with common options being carbon steel, stainless steel, and titanium alloy.
It is important to select the appropriate type of bolt based on the intended application and environmental factors.

• Flathead screw
• Roundhead small screw
• Panhead small screw
• Truss head small screw
• Binding head small screw
• Tapping screw
• Hexagonal tapping screw
• Self-drilling screw
• Wood screw
• Set screw
• Washer assembly screw
• Interior screw (universal screw)
• Coarse thread

• Washer Assembly Hex Bolt
• Hex Bolt
• Fully Threaded Hex Bolt
• Hex Socket Bolt
• Anchor Bolt (Foundation Bolt)
• U-Bolt
• Eye Bolt
• Knob Bolt
• Long Thread Bolt
• Hanger Bolt

Screws and bolts have various standards such as JIS (Japanese Industrial Standards), ISO (International Organization for Standardization), and DIN (Deutsches Institut für Normung) standards. These standards define the diameter, length, thread shape, and head shape of screws and bolts.

Screws are affected by their storage methods, which can impact their quality and lifespan. When storing screws, it is important to keep them in a dry location to prevent moisture and corrosion.
The use of anti-corrosion tools such as rust-preventive paper, rust-preventive vinyl, and silica gel is crucial. For long-term storage, applying rust-preventive oil can help prevent rust and corrosion. Each type of screw may require specific storage methods, so proper management is essential.

Screws require regular maintenance to function properly.
Especially when exposed to the external environment for a long period, it is important to clean them regularly to prevent rust and corrosion. Additionally, if wear or damage occurs, replacement is necessary.

Improper selection of screws can lead to problems such as stripped threads, screw breakage, rust, poor connect or loosening of screws, and damage to the drive portion. It is important to make careful selections to avoid these potential issues.

・Stripped threads: refers to the damage to the screw threads caused by frequent tightening and loosening, especially when the initial tightening is done with high torque using tools. When the screw threads are damaged, it reduces the friction between head screw and nut, which can lead to loosening or inability to tighten properly, resulting in potential issues. The countermeasures include performing careful tightening during screw installation and cleaning, such as removing debris from the male and female threads.

・Thread breakage: Thread breakage can occur due to factors such as insufficient strength, fatigue degradation, or loosening caused by fatigue reduction. This problem occurs when there are loads on the components being fastened, as well as vibrations or repeated load fluctuations. It is important to consider the specific application and the occurrence of vibrations in order to select the appropriate strength of screws.

・Rust formation: Rust is a common problem that can occur due to factors such as insufficient thickness of surface treatments (plating, painting,…), environments with extreme oxidation tendencies near coastlines, or accelerated degradation caused by contact with different factors. It is important to implement preventive measures such as adequate surface treatment and proper storage methods to minimize the occurrence of rust.

・Poor connect or loosening of screws: This is an eternal challenge in the mating of head screw and nut. Loosening can occur due to over-tightening during installation or as a result of vibrations. To prevent loosening, various products with anti-loosening features are available, such as nuts with built-in features in head screw or nut (such as nylon nuts, U-nuts, hard-lock nuts), or washers (such as Nord-Lock washers). Selecting products with anti-loosening functions, available in Japan and other countries, is one approach to addressing this issue.

・Drive portion deformation: This is a common problem that frequently occurs with screws. Through repeated tightening, the cross recess for a Phillips screwdriver may become worn, or excessive force may cause the hex socket to become stripped. These are typical issues that arise. To prevent this, it is important to select appropriate and non-worn-out tools, and when using tools for tightening, it is recommended to initially hand-tighten before applying excessive force. In the event that the drive portion is damaged, there are also various removal tools available. Please feel free to inquire for more information