The most distinctive feature of a through hole socket is its central through-hole, typically ranging from 3 to 12mm in diameter. This design allows bolts, screw rods, or tool shafts to pass through, addressing installation challenges that traditional sockets cannot handle. It is especially useful for scenarios like fastening extra-long bolts, where the through-hole prevents interference between the socket and the workpiece, or for disassembling bolts with integrated washers.

The socket head features precision hexagonal or 12-point tooth patterns, ensuring a contact fit of over 90% with the bolt head. This enables uniform torque transmission, preventing slippage and damage to the bolt surface. Some models are equipped with an elastic retaining ring around the through-hole, which automatically grips the bolt slightly upon insertion, preventing accidental dislodgment during overhead work or in vibrating environments, making them ideal for applications on ship decks or overhead pipelines.

Available in standard sizes covering M4 to M24 bolts (with through-hole diameters matched to the bolt shank), through hole sockets vary in length from 5cm (short models) to 20cm (deep models). Short models are suitable for confined spaces, such as securing electrical terminal posts, while deep models can be paired with extension rods for accessing deep areas like engine blocks.

Unlike traditional sockets that require a three-step operation of "alignment, insertion, and rotation," through hole sockets allow for quick positioning via the through-hole, enabling "plug-and-fit" operation. This significantly streamlines the process, making it highly convenient for one-handed use or in scenarios with limited visibility, such as blind installations behind equipment. Field tests show that using through hole sockets can reduce operation time by approximately 30% during tasks like automotive brake pad replacement.