Simpson Strong-Drive MTHZ1S MTH Wood Underlayment Screw (Collated) - #7 x 1 in., Yellow-Zinc Coated, 2,500-Quantity is engineered by Simpson Strong-Tie for fast and secure underlayment-to-subfloor installations. Unlike nails, the MTH features an intricate high-low thread pattern specifically designed to prevent squeaking by holding underlayment tight to the subfloor and preventing pull-out. The compact trim head allows for a flush surface finish, preventing floor coverings from settling into countersink recesses.

Key Features

• Trim head with nibs for easy countersinking
• #2 square drive
• Driver bit included in each box
• High-low threads resist pull-out and prevent squeaking
• Sharp point for fast, clean starts
• Curved collation for use with compatible auto-feed systems
• Yellow-zinc coating applied in accordance with ASTM F1941
• Quantity: 2,500 screws per package

Specifications

• MPN: MTHZ1S
• Brand: Simpson Strong-Tie
• Screw Size: #7
• Length: 1 in.
• Head Type: Trim Head
• Drive Type: #2 Square
• Thread Type: High/Low Threads
• Point Type: Sharp Point
• Collation Type: Curved
• Coating/Finish: Yellow-Zinc Coated
• Coating Standard: ASTM F1941
• Compatible Tool: Simpson Strong-Tie Quik Drive PRO200SG2 auto-feed screw driving system or attachment
• Quantity: 2,500
• Country of Origin: Taiwan

Approved Applications

• Underlayment / Backer board installation to subfloor

What's Included

• #2 square drive bit (model BIT2S)

Frequently Asked Questions

What makes the MTH Underlayment Screw better than nails for subfloor installations?

Unlike nails, the MTH Underlayment Screw features a high-low thread pattern specifically engineered to grip underlayment tightly to the subfloor. This prevents pull-out and eliminates the squeaking that can result when underlayment shifts or loosens over time.

What auto-feed tool is compatible with these collated screws?

These curved-collated screws are designed to install with the Simpson Strong-Tie Quik Drive PRO200SG2 auto-feed screw driving system or attachment, enabling fast, consistent fastener placement across large floor areas.

What coating is applied to the MTHZ1S screws, and does it meet any standards?

The MTHZ1S screws feature a yellow-zinc coating that is applied in accordance with ASTM F1941, providing a standardized level of corrosion resistance suitable for interior underlayment applications.

Does the trim head design affect the finished floor surface?

Yes - the compact trim head with nibs is designed to countersink easily and sit flush with the underlayment surface. This flush finish prevents floor coverings from settling into countersink recesses, resulting in a smoother, more stable finished floor.

Note: Product dimensions and/or thread length may differ from picture. Please see the item description above for specifications.