NW Through anchor with external thread for middle-heavy duty loads. Rapid application for through fastenings. Diameters from 6 to 20 mm. Driving torque controlled expansion. Expansion clip with anti-rotation fins. Quick application with reduced hole diameter for through fastenings. The most common type of fastener, ideal for the Structural metalwork sector, plant engineering and door and window frames. Steel bar with threaded head, expansion sheath, nut and washer. Fastening piece: position, drill and anchor without moving the item. Remember to leave the threaded body of the nut protruding by at least 2 or 3 mm. The sheath prevents the anchor from rotating during screwing. Expansion is by screwing. Ideal for concrete and natural stone resistant to compression. Stainless steel version for appearance and for installations in acid industrial environments and saline marine ones or in anywhere where the steel can suffer strong chemical attack.