3pcs Fix Bolts Complete
Structural Principle
Material: Galvanized carbon steel (rust-proof, high strength), some high-end models are stainless steel.
Composition: Hex bolt + flat washer + nut + three-piece expansion sleeve (with pre-slit and tightening cone).
Principle: When tightening the nut, the bolt pulls the cone, evenly spreading the three sleeve pieces, like three hands firmly “biting” the hole wall. The force is several times stronger than that of plastic expansion tubes, and it can even lock hollow bricks.
Mainstream Specifications & Compatible Parameters
| Bolt Specifications | Matching Drill Bit Diameter | Common Total Length | Applicable Scenarios |
| M6 | 10mm | 40/50mm | Lightweight Hangers, Shelves |
| M8 | 12mm | 60/70mm | Towel Racks, Small Appliance Brackets |
| M10 | 16mm | 70/80mm | Air Conditioner Outdoor Unit Brackets, Heavy-Duty Shelves |
| M12 | 18mm | 90/100mm | Curtain Walls, Heavy Equipment Fixing |
Core Advantages
Extremely High Load-Bearing Capacity: Taking M10 as an example, the ultimate pull-out force of solid concrete can reach 25kN. Calculated with a safe load-bearing capacity factor of 3-4, it can withstand tens of kilograms of tensile force; reliable anchoring can also be achieved with hollow bricks/perforated bricks (plastic expansion tubes are basically ineffective on hollow bricks).
Widely applicable wall surfaces: Suitable for concrete, red bricks, hollow bricks, lightweight bricks, foam bricks, and marble/stone, earning it the nickname “hollow brick nemesis.”
Easy to install and remove: Simply loosen the nut to remove it; the sleeve is recyclable and reusable (unlike plastic expansion tubes, which are generally disposable).