Number Of sticks - 1000 Pcs They generally have a thinner shaft and a single coarse thread, which cuts into soft materials quickly. The thread of a chipboard screw is self-tapping - the screws are fully threaded up to and including 75mm in length, and anything longer is partially threaded with 70mm of thread. Chipboard screws, also known as particleboard screws, are specialized fasteners designed to securely join chipboard, particleboard, and medium-density fiberboard (MDF). These materials are common in furniture construction, cabinetry, flooring, and other applications where a reliable connection is crucial.