KF2/KFS2 Broaching Nuts PEM KF2/KFS2 Broaching Nuts utilize surface-mount, broaching, and flaring technology for PC boards. These broaching nuts are knurled-shank fastening devices that can be pressed into a hole to provide a permanent, strong, threaded, or unthreaded attachment point. These KF2/KFS2 broaching nuts are used in aluminum, acrylic, casting, and polycarbonate components.