Acorn SW-MW1W250 Metal to Wood Screw 250 Count

Product Description

The ACORN SW-MW1W250 is a self-piercing, sealing tapping screw designed for fastening metal to wood in roofing and siding applications. Made 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 that conforms to the surface and creates a lasting weatherproof seal. The twin-lead Type 17 point and hi-lo thread pattern deliver faster drive times and increased pull-out resistance. All screws carry a 1,000-hour salt spray rating with a dacro base coating. Sold in packs of 250.

These screws are suited for residential and light commercial roofing and siding installations where a reliable metal-to-wood connection is required. The EPDM washer seals around the fastener on contact, making them a standard choice for attaching metal roofing panels, corrugated cladding, and metal siding to wood framing or decking. The hex washer head allows use with standard hex-drive power tools for efficient installation across large surface areas.

Key Features

• Self-piercing design eliminates the need for pre-drilling in typical roofing and siding applications
• Heat-treated C1022 steel construction with case hardening for strength and durability
• Assembled EPDM washer seals against moisture infiltration and conforms to irregular surfaces
• Twin-lead Type 17 point with hi-lo threads for faster drive time and greater pull-out resistance
• Dacro coating rated to 1,000 hours of salt spray exposure for corrosion protection
• 1/4-inch across-flat hex washer head compatible with standard power drivers

Compatibility

Designed as an OEM-style fastener for metal-to-wood 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-drive bit sized to the 1/4-inch across-flat head. Avoid overtightening, as excessive torque can compress the EPDM washer beyond its sealing range and reduce effectiveness. Follow applicable local building codes and manufacturer panel guidelines for fastener spacing and penetration depth.

Technical Specifications

• Material: Heat-treated C1022 steel, case hardened
• Head Type: High-hat hex washer head
• Head Size: 1/4 inch across flat
• Screw Length: 1 inch
• Washer Material: EPDM (Ethylene Propylene Diene Monomer)
• Point Type: Twin-lead Type 17
• Thread Type: Hi-lo
• Coating: Dacro, 1,000-hour salt spray rated
• Quantity: 250 per pack
• Package Weight: 2 pounds

Standard Information

• Brand: ACORN
• Manufacturer Part Number: SW-MW1W250