The main classification of fasteners and their functions

I. Classification by Structure

1. Bolts

Bolts consist of a head and a threaded shaft, usually used with nuts. Their function is to fasten multiple parts together by passing through holes in the workpieces.

2. Nuts

Nuts are used in conjunction with bolts. They have internal threads and work by being tightened or loosened to either connect or separate the workpieces.

3. Screws

Screws are generally divided into self-tapping screws and machine screws. Self-tapping screws can be directly screwed into pre-drilled holes to form threads, while machine screws need to be used with nuts or internally threaded holes.

4. Studs

Studs have threads on both ends and are suitable for fastening two parts together where space is limited, often used in flange connections.

5. Washers

Washers are used between bolts and nuts, and are classified into flat washers and spring washers. Their function is to distribute the pressure of the threaded connection and prevent loosening.

6. Pins

Pins are used for positioning, connecting, or locking parts, and come in various types such as cylindrical pins, tapered pins, and split pins.

7. Rivets

Rivets connect parts by deforming their tail end, commonly used in permanent, non-detachable connections.

II. Classification by Usage

1. General Fasteners

These fasteners are widely used in common fields like machinery manufacturing, construction, household items, etc., including bolts, screws, nuts, and more.

2. Special Fasteners

These fasteners are designed for specific industries, such as automotive fasteners, aerospace fasteners, and fasteners for electronic devices.

3. High-Strength Fasteners

High-strength fasteners are mainly used in situations that require the bearing of large loads, such as in large machinery or steel structures.

III. Functions

1. Connection

The most basic function of fasteners is to connect two or more parts and form them into a single unit.

2. Fixation

Fasteners securely fix parts together through threads or other mechanical means, ensuring they do not loosen or separate.

3. Transmission of Force and Motion

Fasteners can bear and transmit external forces such as tension, compression, or torque, ensuring stable operation of the connected parts.

4. Positioning and Adjustment

Fasteners like pins and washers are used to ensure precise positioning of parts or to prevent loosening.

Fasteners play a crucial role in various industrial and everyday applications, ensuring the safety, stability, and durability of structures.

www.guochenghardware.com