High Strength Expansion Screws Expansion Anchor Bolts

• Customization: Available
• Material: Steel
• Surface Finishing: Zinc Plated
• Model NO.: 1-1
• Certification: ISO
• Customized: Customized
• Strength Level: 4.8
• Use: Fixed
• Applicable Industries: Construction Industry, etc.
• Whether to Support Customization: Support
• Transport Package: Container
• Specification: 1-30
• Trademark: Huilin
• Origin: Handan, Hebei
• HS Code: 0101101010
• Production Capacity: 50000

Product Description

Expansion screw is a mechanical component that uses the principle of expansion to achieve fastening connections. It is widely used in various construction, decoration, and equipment installation scenarios. The following is a detailed introduction to it:

1. Structural composition

Bolt: The main body part has threads and one end is a screw, used to screw in nuts or connected parts; The other end is the bolt head, which is commonly shaped as hexagonal, circular, etc., making it easy to tighten with tools.

Expansion tube: usually made of plastic or metal, wrapped around a bolt, with a thin wall and longitudinal cut. During the tightening process of the bolt, it will expand under force.

Nut: Used in conjunction with a bolt, the expansion tube is pushed to expand by rotating the nut.

Gasket: placed between the nut and the connected part, it can increase the force area, prevent damage to the surface of the connected part when tightening the nut, and also have a certain anti slip effect.

2. Working principle

Firstly, drill holes on the substrate (such as concrete, brick walls, etc.), and the diameter and depth of the holes should match the specifications of the expansion screws; Insert the expansion screw into the hole and tighten the nut; As the nut is tightened, the bolt is pulled outward, and the expansion tube is compressed, opening and expanding along the longitudinal incision; The expansion tube is tightly attached to the hole wall, generating significant friction and compression force, thereby fixing the expansion screw in the base and achieving a firm connection.

3. Common types

Metal expansion screws: high strength, good corrosion resistance, suitable for high-strength substrates such as concrete and solid bricks, commonly used for installing heavy equipment, steel structures, etc.

Plastic expansion screw: Made of soft material with relatively low expansion force, mainly used to fix lightweight objects such as picture frames and small decorative pendants on low strength substrates such as hollow bricks and gypsum boards.

4. Specification parameters

The specification is represented by "diameter x length", such as M6 x 60, where "M6" indicates a bolt diameter of 6 millimeters and "60" indicates a bolt length (including the expansion tube) of 60 millimeters. There are generally various diameters such as M4, M5, M6, M8, M10, etc., with lengths ranging from 25mm to 200mm or even longer. Different specifications are suitable for different load-bearing requirements and installation scenarios.

5. Application scenarios

Building decoration: When installing household items such as doors, windows, curtain rods, bathroom equipment, kitchen cabinets, etc., expansion screws can ensure that the objects are firmly fixed to the wall; In construction, it is used to fix temporary structures such as scaffolding and formwork support, as well as some permanent building components.

In the industrial field, metal expansion screws ensure stable operation of equipment due to their high strength and reliable fixing performance in scenarios such as mechanical equipment installation, pipeline support fixation, and equipment foundation fixation in factories.