How to choose expansion bolts

2025-06-10

Load-bearing requirements: Select the specification based on the weight of the object to be installed. For light loads (such as hanging photo frames), use M6-M8 bolts; For medium loads (such as bookshelves), select M10-M12; For heavy loads (outdoor units of air conditioners), M14 or above is required, and the screw length should be embedded in the wall by more than 50mm to ensure the anchoring depth.

Wall material: For concrete walls, steel expansion bolts can be selected and matched with metal sleeves. Hollow brick walls or lightweight walls should use plastic expansion pipes and self-tapping screws to prevent wall cracking. The surface of tiles or marble should be drilled before installation to prevent cracking.

Bolt type: Expansion sleeve type, suitable for ordinary walls; Expansion screw type (such as vehicle repair bolts) is suitable for high-strength fixation; Perforated expansion bolts can be equipped with safety ropes and are suitable for high-altitude or vibrating scenarios (such as industrial equipment).

Environmental factors: In a humid environment, choose galvanized or stainless steel materials to prevent rust. In high-temperature environments, avoid plastic sleeves and use metal materials instead.

In addition, before installation, it is necessary to confirm that the bolt length (screw + sleeve) matches the hole diameter. Generally, the hole diameter is 1-2mm larger than the bolt diameter to ensure the expansion effect.

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