Which type of anchor is considered a female type fastener?

• A. Toggle bolts
• B. Drop-in anchor
• C. Wood screws
• D. Expansion bolts

Answer: (B)

The drop-in anchor is classified as a female type fastener because it is designed to receive a male fastener, such as a bolt. This type of anchor consists of a cylindrical metal sleeve that is inserted into a pre-drilled hole in concrete. When a male bolt is threaded into the drop-in anchor, it expands against the walls of the hole, securing it in place. This mechanism allows the drop-in anchor to hold significant weights and is commonly used in applications where a flush finish is required.

Other options, while useful in various fastening scenarios, serve different functions. Toggle bolts and expansion bolts are male anchors that function by expanding within a material to create a strong hold but do not provide a female fastening mechanism for a bolt. Wood screws are simply threaded fasteners used primarily in wood and do not have the complex expansion mechanism that characterizes female-type anchors. Thus, the drop-in anchor stands out for its distinct female fastening capability.