A Molly anchor is a sleeve-type expansion anchor designed for medium-duty fastening in hollow walls like drywall or plaster. When tightened, the sleeve collapses behind the wall, creating a secure grip with a wide distribution of load.

Sleeve anchors use a split sleeve over a threaded stud, expanding along the full length of the sleeve when tightened. Standard expansion anchors rely on the wedge at the bottom to expand against the concrete walls. Sleeve anchors are ideal for softer masonry or brick, while wedge expansion anchors are preferred for solid concrete.

The choice depends on the weight of the object. For light loads, plastic self-drilling or expansion plug anchors are sufficient. For medium to heavy loads, Molly bolts, toggle bolts, or metal drywall anchors provide the safest holding capacity.

Yes, heavy-duty mechanical anchors like concrete expansion anchors or drop-in anchors are designed to hold heavy structural elements. However, ensure they are rated for tensile and shear loads matching your specific project requirements.

Generally, expansion anchors are not reusable once fully set, as the expanding sleeve or wedge permanently deforms to grip the concrete. Attempting to reuse them can compromise structural safety and load capacity.