This article summarizes screws and bolts commonly used in general manufacturing sites, organizing their characteristics in an easy-to-understand format.
Please use this as a practical reference list for everyone handling screws, including those in the manufacturing and construction industries.

Basic Knowledge of Screws and Bolts

If you want to grasp the basics of screws and bolts thoroughly, start by checking the “Basic Knowledge of Screws and Bolts.”
It explains essential information such as types of screws and how to read dimensions in a concise manner.

Detailed information is available at the following link:

URL: https://ohtavn.com/en/about-dealings/basic-knowledge/

List of Features of Screw and Bolt

Machine Screws

Machine screws are widely used to fasten relatively small components such as machinery and electronic devices. They are designed to be screwed into pre-tapped holes and serve as versatile fastening parts in many applications.

Main Features:

• Used mainly for components with pre-tapped holes; commonly used for fixing internal mechanisms or precision parts.
• Available in various head shapes (round, flat, bind, etc.), selectable based on application or appearance.
• Ideal for assembling small and lightweight parts such as industrial products and electronic devices.

▼Reference Article
URL: https://ohtavn.com/en/media/what-is-machine-screw/

Built-in Screws

Built-in screws are supplied already attached to components during the product assembly process. They are integrated with housings or parts to prevent falling off or getting lost, contributing to improved manufacturing efficiency and maintenance.

Main Features:

• Supplied in a state where the screw is pre-fixed to the component, contributing to efficient assembly processes.
• Prevents loss or dropping; widely used in precision equipment requiring safety and reliability.
• Does not fall off during disassembly or maintenance, making reuse easy.

▼Reference Article
URL: https://ohtavn.com/en/media/what-is-built-in-screw/

Micro Screws

Micro screws are extremely small screws with a diameter of less than 1mm, used to fasten micro parts in precision instruments and electronic components. They are adopted in fields requiring high processing accuracy and reliability and may require special fastening techniques.

Main Features:

• Ultra-small size with a diameter of 1mm or less, ideal for fastening micro parts.
• Used in fields that demand high precision, such as watches, cameras, medical devices, and electronics.
• In some cases, dedicated tools and careful torque control are required for fastening.

▼Reference Article
URL: https://ohtavn.com/en/media/what-is-micro-screw/

Drill Screws

Drill screws have a drill-like tip that allows them to be driven directly into metal plates without pre-drilling. They are widely used on job sites where reduced work time and increased efficiency are required.

Main Features:

• The drill-shaped tip enables direct fastening without the need for pre-drilled holes.
• Ideal for fast construction in metal sheets and lightweight steel frames such as on building sites or during piping work.
• One-piece construction reduces the burden on materials and lowers the risk of work errors.

▼Reference Article
URL: https://ohtavn.com/en/media/what-is-drill-screw/

Tapping Screws

Tapping screws are equipped with a self-tapping function that forms internal threads as they are driven into pre-drilled holes in metal or plastic. No tapping process is required, enabling quick and efficient fastening.

Main Features:

• Self-tapping structure forms internal threads automatically when screwed into the material.
• No need for tapping process, reducing work steps; suitable for mass production assembly.
• Used for fastening into relatively soft materials such as thin steel plates, aluminum, or plastic.

▼Reference Article
URL: https://ohtavn.com/en/media/what-is-tapping-screw/

High-tech Screws

High-tech screws refer to specially designed screws with higher functionality and performance than conventional ones. They are developed to solve specific challenges such as vibration resistance, loosening prevention, or high torque transmission and are often used in advanced technology fields and harsh environments.

Main Features:

• High-performance screws with specific functions such as anti-loosening, vibration resistance, and weight reduction.
• Used in high-precision, high-reliability fields like automotive, aerospace, and electronics.
• Selection depends on application due to unique designs and materials used by manufacturers.

▼Reference Article
URL: https://ohtavn.com/en/media/what-is-high-tech-screw/

Tamper-Resistant Screws

Tamper-resistant screws have a special shape that cannot be removed with standard tools, and are used for preventing theft or unauthorized tampering. They are effective for improving safety and reliability in environments where many people have access, such as stations, public facilities, and outdoor equipment.

Main Features:

• Shaped to prevent removal without special tools; effective for theft and tampering prevention.
• Widely used in outdoor facilities, public infrastructure, medical devices, etc.
• Available in various special shapes such as Torx and pin-in-head types.

▼Reference Article
URL: https://ohtavn.com/en/media/what-is-tamper-resistant-screw/

Construction Screws

Construction screws are designed for use with various building materials such as wood, gypsum board, and concrete. They are widely used in construction and interior work. Screw shape, material, and surface treatment are optimized for each target material.

Main Features:

• Specially designed for each type of material such as wood, gypsum board, light steel frames, and concrete.
• Structure prioritizes pull-out resistance, holding strength, and durability, ensuring reliability after installation.
• Rust-resistant treatment and high-strength materials make them suitable for outdoor or high-humidity environments.

▼Reference Article
URL: https://ohtavn.com/en/media/what-is-construction-screw/

Cap Screws (Hex Socket)

Cap screws (hex socket head bolts) are cylindrical screws with a hexagonal hole in the head, tightened using a hex wrench. Their clean appearance and compact head make them ideal for machines and precision instruments requiring space-saving designs.

Main Features:

• Hex socket allows secure torque application even in confined spaces.
• Compact and rounded head offers a sleek look and enhances safety.
• Commonly used machine screws in machinery, precision instruments, and industrial equipment.

▼Reference Article
URL: https://ohtavn.com/en/media/what-is-cap-enamel/

Conclusion

For inquiries regarding samples or materials, please respond to this email or contact our sales representative!

At Ohta Vietnam, we not only provide ready-made products such as screws and bolts, but also support activities in the manufacturing field such as cutting, inspection, assembly, packaging…
Our equipment list is here

As a “specialized support” for the manufacturing industry in Asia. If you have any related questions, feel free to contact Ohta Vietnam for detailed support!
URL: https://ohtavn.com/en/contact/

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