BD Fastener offers machine screws in a wide range of materials and finishes, from small to large diameters; conforming to international standards. What is a Slotted Machine Screw? Slotted Machine Screws are threaded fasteners with straight grooves (one-slot) in the head for reliable connections in preformed threaded holes, which can be installed using a one-slot … Continue reading Slotted Machine Screws