A nut driver bit is designed to install nuts onto threaded shafts, such as all-thread rods and bolts. The nut driver bit may be driven by a power drill which causes a driver end of the nut driver bit to rotate. The driver end may contact a nut, thereby causing the nut to rotate. The driver end may be covered in with a contact grip for gripping the nut during use. A worker may install and spin a nut on a threaded shaft without requiring their fingers to manually rotate the nut. The nut driver bit may drastically reduce the time required to install nuts onto threaded rods.