Acorn SW-MW25W250 Metal to Wood Screw 250 Count

Product Description

The ACORN SW-MW25W250 is a self-piercing, sealing tapping screw engineered for roofing and siding applications where a weather-tight fastener is required. Manufactured from heat-treated C1022 steel with case hardening, each screw features a 1/4-inch across-flat high-hat hex washer head with an assembled EPDM (Ethylene Propylene Diene Monomer) washer that compresses against the substrate to form a durable, long-lasting seal. The twin-lead Type 17 point and hi-lo thread profile deliver faster drive times and increased pull-out resistance compared to standard tapping screws. A dacro base coating provides 1,000-hour salt spray corrosion resistance, topped with a white powder coat finish. Sold in a 250-count pack weighing 3.682 pounds.

These metal-to-wood screws are intended for attaching metal panels, roofing sheets, and siding to wood substrates in both residential and light commercial construction. The EPDM washer seals the fastener penetration point, making this screw suitable for exterior installations where moisture infiltration at the fastener hole is a concern. The white powder-coat finish is matched to common white metal roofing and siding panels. Roofers, siding installers, and general contractors will find the hi-lo thread geometry particularly useful when driving into softer wood decking or framing members beneath metal cladding.

Key Features

• Self-piercing Type 17 point eliminates the need for pre-drilling in most metal-to-wood applications
• Hi-lo thread profile increases pull-out resistance and reduces drive torque
• Assembled EPDM washer seals the fastener hole against moisture intrusion
• 1/4-inch across-flat high-hat hex washer head for standard hex-driver bits
• Dacro base coating rated to 1,000-hour salt spray resistance per standard test protocol
• White powder coat applied over dacro base for color-matched exterior installations

Compatibility

Designed as an OEM-style fastener for metal-to-wood roofing and siding panel installations where a 2-1/2-inch hex washer head sealing screw with EPDM washer is specified.

Installation Notes

Installation is typically performed by roofing or siding contractors using a hex-driver bit sized for a 1/4-inch hex head. Confirm substrate thickness and screw penetration depth meet applicable building code requirements before installation. Do not overdrive the screw — compressing the EPDM washer excessively will degrade the seal and reduce pull-out strength. Follow panel manufacturer guidelines for fastener spacing and edge-distance requirements.