Acorn SW-MW15LG250 Metal to Wood Screw 9x1.5in 250ct

Product Description

The ACORN SW-MW15LG250 is a self-piercing, sealing tapping screw engineered for roofing and siding applications where a weathertight fastener is required. Made from heat-treated C1022 steel with a case-hardened construction, each screw features a 1/4-inch across-flat high-hat hex washer head with an assembled EPDM (Ethylene Propylene Diene Monomer) washer that conforms to the substrate for a secure, long-lasting seal. The twin-lead Type 17 point and hi-lo thread form drive faster and resist pull-out more effectively than standard tapping screws. These screws measure 9 x 1-1/2 inches and come packed 250 per container. Intended for installation by roofing contractors, siding installers, and sheet metal tradespeople.

The SW-MW15LG250 is designed for metal-to-wood fastening in residential and commercial roofing and siding work. The EPDM washer creates a weatherproof seal at each penetration point, making these screws well-suited for corrugated and ribbed metal panel installations over wood substrates. The light gray powder coat is applied over a dacro base coating that has passed a 1,000-hour salt spray test, providing corrosion resistance suited to exterior exposure. The color finish allows fasteners to blend with matching panel colors in finished installations.

Key Features

• Self-piercing Type 17 point for no pre-drilling required in metal-to-wood applications
• Heat-treated C1022 steel with case hardening for strength and durability
• EPDM washer conforms to surface for a weathertight, long-lasting seal
• Hi-lo thread form reduces drive time and increases pull-out resistance
• Dacro base coating with light gray powder coat finish passes 1,000-hour salt spray test
• Packed 250 screws per container for jobsite-ready quantity

Compatibility

Designed as a metal-to-wood tapping screw for roofing and siding panel installations where a sealed, corrosion-resistant exterior fastener is required.

Installation Notes

Installation is typically performed by roofing or siding contractors using a hex-drive bit sized to the 1/4-inch across-flat head. Drive speed should be controlled to avoid over-driving, which can compress the EPDM washer beyond its effective sealing range. Follow applicable building codes and manufacturer panel guidelines for fastener spacing and edge distance. Inspect installed screws for proper washer contact with the panel surface before declaring the installation complete.