Acorn SW-MW15G250 Metal to Wood Screw 250 Count

Product Description

The ACORN SW-MW15G250 is a 1-1/2 inch self-piercing, sealing tapping screw designed for metal-to-wood fastening in roofing and siding applications. Manufactured from heat-treated C1022 steel with a case-hardened finish, each screw features a 1/4 inch across-flat high-hat hex washer head with an assembled EPDM (Ethylene Propylene Diene Monomer) washer. The EPDM washer conforms to the mating surface to deliver a weathertight, long-lasting seal. A twin-lead Type 17 point combined with hi-lo threads reduces drive time and improves pullout resistance. All screws carry a 1,000-hour salt spray rating through dacro base coating. Sold in a 250-count pack.

These screws are suited for attaching metal panels, cladding, and roofing sheets to wood substrates in both residential and light commercial construction. They are commonly installed by roofing contractors, siding installers, and general trades working with metal-over-wood assemblies. The self-piercing tip eliminates the need for a pre-drilled pilot hole in most standard gauge metal-to-wood applications, speeding up installation on standing seam roofing, corrugated panels, and lap siding systems.

Key Features

• Self-piercing, sealing tapping screw design eliminates pilot hole drilling in standard applications
• Heat-treated C1022 steel construction with case hardening for durability in roofing and siding environments
• 1/4 inch across-flat high-hat hex washer head with assembled EPDM washer for weathertight sealing
• Twin-lead Type 17 point and hi-lo threads for faster drive times and improved pullout resistance
• Dacro base coating rated to 1,000-hour salt spray test for corrosion resistance
• Packed 250 screws per pack for straightforward job-site quantity management

Compatibility

Designed as an OEM-style metal-to-wood fastener for roofing and siding applications where a self-piercing, sealing screw with an EPDM washer is specified.

Installation Notes

Installation is typically performed by roofing or siding contractors using a hex-head screw driver bit sized to the 1/4 inch across-flat hex head. Avoid overtightening, as excessive torque can compress the EPDM washer beyond its effective sealing range and reduce holding strength. Ensure the substrate lumber or structural sheathing is sound and free of voids before driving. Follow applicable local building codes and manufacturer panel specifications when determining fastener spacing and edge distances.