Acorn SW-MW1BW250 Metal to Wood Screw 250 Count

Product Description

The ACORN SW-MW1BW250 is a self-piercing, self-tapping metal to wood screw designed for roofing and siding applications. 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 washer for a secure, weatherproof seal. The twin lead Type 17 point and hi-lo thread design reduce drive time and increase pull-out resistance. All screws are dacro-coated to pass a 1,000-hour salt spray test, with a bright white powder coat applied over the dacro base. This pack contains 250 screws.

These screws are intended for attaching metal panels or components to wood substrates in residential and commercial roofing and siding installations. The EPDM washer conforms to the fastened surface, creating a long-lasting seal that resists water infiltration. The hex washer head drives easily with standard hex-driver bits, making them well-suited for production-rate fastening work on standing seam panels, metal roofing, and metal cladding systems.

Key Features

• Self-piercing, self-tapping design eliminates the need for pre-drilling in most metal-to-wood applications
• Heat-treated C1022 steel with case hardening for strength and durability
• 1/4-inch-across-flat high-hat hex washer head with assembled EPDM washer for a weatherproof seal
• Twin lead Type 17 point and hi-lo threads for faster driving and greater pull-out resistance
• Dacro base coat rated to 1,000 hours of salt spray testing for corrosion resistance
• Bright white powder coat finish over dacro for color-matched roofing and siding installations

Compatibility

Designed as a metal-to-wood fastener for roofing and siding applications where metal panels or components are secured to wood framing or sheathing substrates.

Installation Notes

Installation is typically performed by roofing or siding contractors using a hex-driver bit matched to the 1/4-inch-across-flat head. Follow applicable building codes and manufacturer panel specifications for fastener spacing and edge distances. Do not overdrive the screw, as compressing the EPDM washer beyond its design limit will reduce sealing performance. Fasteners should be driven perpendicular to the panel surface to ensure full washer contact.

Technical Specifications

• Material: Heat-treated C1022 steel, case hardened
• Head Style: High-hat hex washer head
• Head Size: 1/4 inch across flat
• Washer Material: EPDM (Ethylene Propylene Diene Monomer)
• Thread Type: Twin lead Type 17 point, hi-lo threads
• Screw Length: 1 inch
• Coating: Dacro base coat with bright white powder coat topcoat
• Corrosion Rating: 1,000-hour salt spray tested
• Quantity per Pack: 250 pieces
• Pack Weight: 2.107 pounds
• UPC: 00810468000296

Standard Information

• Brand: ACORN
• Manufacturer Part Number: SW-MW1BW250