Selection and usage precautions of self tapping screws

Self tapping screws, also known as quick acting screws, are a special type of steel fastener whose surface is typically treated with galvanized passivation. The following is a detailed introduction to self tapping screws:

1、 Definition and Characteristics

Definition: Self tapping screw is a type of fastener with self tapping threads (wide thread) that can self tap and form internal threads in the connected part, thereby achieving a tight connection.

characteristic:

The core has good toughness and can withstand large tightening torques.

The unique thread design makes it easy to form internal threads in the connected parts.

Surface galvanizing passivation treatment improves the corrosion resistance and service life of screws.

2、 Types and classifications

Self tapping screws can be classified into various types based on their functions and structural characteristics, mainly including:

Ordinary self tapping screw: The thread is self tapping thread, and the surface is mostly electroplated, suitable for various materials.

Self cutting self tapping screws: including various shapes such as cross groove pan head, countersunk head, semi countersunk head, etc. The thread can be self tapping thread or machine thread, suitable for connections that require cutting materials and forming threads.

Self squeezing self tapping screw (self tapping locking screw): The thread is generally machine thread, and the cross section of the screw is triangular (triangular thread screw), which has good tightening control and tightening torque, and is suitable for occasions that require high connection strength and overall firmness.

Self drilling self tapping screw (self drilling screw): The thread type varies according to different standards. Chinese, German, and international standards use self tapping thread, while the American ASME and SAE standards use BSD type as self tapping thread and CSD type as machine thread. Suitable for connections that require simultaneous drilling and tapping.

Other types include metal drive screws (metal strong tapping screws), wall panel self tapping screws (drywall screws), fiberboard screws, and combination self tapping screws, each with their specific application scenarios and advantages.

3、 Application scenarios and purposes

Self tapping screws are widely used in various fields due to their unique design and wide range of applications:

Home decoration: used to fix decorative materials such as furniture, doors and windows, flooring, etc., to improve the stability and safety of the overall structure.

Construction engineering: In building structures, it is used to fix materials such as steel bars, brackets, and templates to ensure the structural safety of the building.

Car maintenance: Used to fix components such as the engine, chassis, and doors during the car maintenance process, improving the safety and reliability of the vehicle.

Electronic product manufacturing: In the process of electronic product manufacturing, it is used to fix components such as circuit boards and casings to ensure the appearance and performance of the product.

4、 Selection and usage precautions

Choose the appropriate type: Select the appropriate self tapping screw type based on factors such as connection material, connection thickness, and required fastening force.

Preprocess the connected component: Pre make threaded bottom holes on the connected component (for thicker materials) or directly use self tapping screws for tapping (for thinner materials).

Control tightening torque: Avoid excessive tightening torque that may cause screw breakage or damage to connecting components.

Pay attention to corrosion prevention: When used in humid or corrosive environments, self tapping screws with better corrosion resistance should be selected or additional corrosion prevention measures should be taken.

In summary, self tapping screws, as a multifunctional fastening solution, have become an indispensable part of our lives due to their unique characteristics and wide range of applications.