Main Types and Structures

Screw Bolts

Screw bolts are classified into various types based on the shape of the head, the structure of the shaft, and the sealing property:

Head Shape:

Flat Head: The most commonly used type, providing an enhanced bearing surface, and the head is exposed outside the plate surface after the connection is secured.

Countersunk/Small Countersunk: Installed in a hole with chamfers, the head is flush with the surface of the plate, giving a beautiful appearance.

Shaft Design:

Smooth Body: Standard circular shaft, suitable for general connections.

Knurled/Ribed Body: Increases friction with the hole wall, effectively preventing the bolt from slipping after installation.

Hexagon/Semi-Hexagon (Hexagonal Body): Installed in a hexagonal hole, with extremely high elastic resistance, completely preventing rotation.

Termination Form:

Open End (Through Hole): The bolt can be installed, the length is not specified, and it is basically universal.

Closed End (Blind Hole): The joint is closed, preventing water or other substances from entering the internal thread, providing a sealing function. Bay Supply

Bay Supply

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Material Classification

Based on the strength and protection requirements of the application environment, tension bolts usually adopt the following materials:

Carbon Steel (Steel): Usually coated with coatings (such as colored zinc or blue-white zinc), balancing cost and strength, and is the most common choice in industry.

Stainless Steel (Stainless Steel): Such as 304 or 316 materials, with excellent corrosion resistance, suitable for outdoor, humid or medical, food industries.

Aluminum (Aluminum): Light in texture and with certain corrosion resistance, often used in aviation, automobiles or electronic products with weight reduction requirements.

Application scenario

Self-tapping screws are widely used in situations where it is impossible to operate from the back or where the material is too thin to be threaded: 

Automobile manufacturing: Interior installation, luggage rack fixation, etc.

Aerospace: Lightweight connections for thin shells and frame structures.

Sheet metal enclosures: Assembly of chassis and electrical control cabinets.

Furniture and household appliances: Metal tubular furniture, air conditioning shells, etc.

Installation Tools

To install the rivet nuts, a dedicated rivet gun (Rivnut Gun) must be used:

Manual rivet gun: Suitable for small DIY or repair tasks.

Pneumatic rivet gun: High production efficiency, suitable for industrial assembly line operations.

Electric/charging rivet gun: Combines portability with efficiency, suitable for outdoor installation operations.