Coarse Thread Drywall Screws – Carbon Steel – Indoor Use

Product OverviewExplore our 100mm coarse thread drywall screws, designed for heavy-duty applications that require exceptional penetration through multiple board layers. Each screw is made from hardened carbon steel with a black phosphate coating, providing light corrosion resistance and a clean, low-glare finish.The bugle head ensures smooth, flush seating without tearing the board’s paper surface, achieving a professional, ready-to-fill finish. The sharp W-type gimlet point allows easy penetration and rapid engagement into timber, reducing driving effort. The coarse thread is optimized for wood substrates, delivering strong bite and resistance to pull-out in natural grain.These 100mm heavy-duty long fixings are ideal for deep board assemblies and heavy timber frameworks. Product Specifications Specification Details Product Coarse Thread Indoor/Outdoor Usage Indoor Material Type Carbon Steel Length 25mm Diameter 3.5mm Sales Unit Box Box Quantity 1000 Head Type Bugle Drive Type Phillips Thread Type Coarse Thread Length Fully Threaded Collated No Colour Black Features & Benefits Material: Hardened carbon steel ensures strength and consistent driving torque. Corrosion Resistance: Black phosphate coating resists rust and oxidation under dry interior conditions. Head Design: Bugle head compresses gypsum and paper for a flush surface finish. Thread Type: Coarse W-type thread offers fast drive and secure grip in timber. Point Type: Sharp gimlet point ensures quick starting and reduced splitting. Nominal Size: 100mm length. Box Quantity: Supplied in a box of 500 for efficient coverage of high-volume projects. Applications Multi-layer Drywall Assemblies: Ideal for extra-deep wall systems. Timber Framing and Joists: Provides strong hold for reinforced wall and ceiling structures. Heavy Partition Walls: Reliable fixing through deep substrate layers. Installation Guidance Drive Type: Use a Phillips No.2 bit for controlled installation. Speed Setting: Drive at medium speed to avoid over-countersinking. Depth Control: Seat screw head just below the paper surface without rupturing. Spacing: Maintain 250mm centers on walls and 150mm on ceilings. Compliance & Performance Manufacturing Reference: Produced in accordance with EN 14566 for drywall screws. Finish: Black phosphate coating provides corrosion protection for interior use. Safety: Always wear eye protection and ensure stable support when driving. Important Note: Not suitable for exterior or high-moisture environments. FAQ Can these screws be used outdoors? No, they are not suitable for exterior or high-moisture environments. What bit should be used? Use a Phillips No.2 bit for best results. Are these screws suitable for metal studs? They are optimized for wood substrates and may not perform as well with metal.