







The top burst screw, often referred to as the top burst expansion screw or ceiling expansion bolt, is a specialized expansion screw designed for excellence in installation applications. Its distinct structure and performance make it indispensable in numerous installation scenarios. Let's delve into an in-depth exploration of its structure, working principles, characteristics, applications, usage methods, and vital precautions:
Structure: The top burst screw is a marvel of engineering, chiefly comprising a casing, expansion tube, screw, nut, and gasket. The casing's cylindrical form features a closed bottom and an open top, housing the expansion tube within. The screw threads through this assembly, with a flat or cross-shaped top making it tool-friendly, while its conical base enhances functionality. Nuts and washers are employed to steadfastly secure objects.
Working Principle: Begin by drilling a hole in the installation base. Insert the top burst screw, twisting it with a tool. As the screw moves upwards, its conical base causes the expansion tube to gradually enlarge. Given the casing's closed bottom, the tube can only expand outward, pressing against the hole's walls, generating robust friction and anchoring force, thus securely fastening the object to the base.
• Characteristics
Unparalleled Anchoring Force: The ingenious design ensures a broad contact area with the wall post-expansion, providing superior anchoring strength compared to conventional expansion screws, ideal for supporting heavier items.
Effortless Installation: The straightforward operation involves simply tightening the screw to complete the expansion and fixation, significantly boosting construction efficiency.
Exceptional Concealment: Post-installation, the sleeve remains discreetly within the hole, offering a neat appearance that's perfect for applications where aesthetics are paramount.
Supreme Stability: Even under considerable tension and vibration, it maintains a reliable fixation, ensuring a stable and secure connection.
• Usage Scenarios
Decoration and Renovation: Ideal for securely installing ceiling joists, chandeliers, and large decorative paintings, ensuring the safety and stability of decorative components.
Home Installation: Perfect for anchoring heavy furniture such as large wardrobes and bookcases, ensuring the safe use of home furnishings.
Engineering Construction: Provides dependable support and fixation for components in mechanical and electrical installations, pipeline anchoring, and other engineering projects.
• Instructions for Use
1. Measurement and Positioning: Utilize measuring tools to precisely mark drilling points at the installation site according to specifications.
2. Drilling: Choose a compatible drill bit for the top burst screw specification. Drill vertically at the marked point, ensuring the hole is slightly deeper than the screw length for full insertion.
3. Screw Insertion: Insert the entire top burst screw into the drilled hole, ensuring the sleeve fits snugly against the hole walls.
4. Fixing Objects: Align the object with the screw, then place the gasket and nut. Use a wrench or power tool to tighten the nut; as the screw ascends, the expansion tube broadens to secure the fixation.
• Precautions
Specification Matching: Select the appropriate top burst screw specification based on the installation object's weight, size, and material to ensure adequate load-bearing capacity.
Quality Inspection: Inspect all components of the top burst screw meticulously before installation. Replace any deformed or damaged screws or expansion tubes immediately to maintain optimal fixing performance.
Control Force: When tightening the nut, apply just the right amount of force to prevent screw breakage or excessive tube expansion, which could harm the substrate. Avoid insufficient force to ensure a secure and effective fixation.