Simpson Strong-Drive MTH Wood Underlayment Screw (Collated) - #7 x 1-1/4 in. Gray Phosphate, 2500-Pack (Model MTH114S) is engineered by Simpson Strong-Tie for fast and secure underlayment-to-subfloor installations. Unlike nails, this screw features an intricate high-low thread pattern designed to prevent squeaking by holding underlayment tight to the subfloor and preventing pull-out. Its compact trim head allows for a flush surface and prevents floor coverings from settling in countersink recesses.

Key Features

• Trim head with nibs for easy countersinking
• #2 square drive
• Driver bit included in each box
• High-low threads designed to prevent squeaking and pull-out
• Sharp point for fast, clean penetration
• Curved collation for use with compatible auto-feed driving systems
• Gray phosphate coating is recommended for dry, low-corrosion environments
• Quantity: 2,500 screws per pack

Specifications

• Model Number: MTH114S
• Screw Size: #7
• Length: 1-1/4 in.
• Head Type: Trim Head
• Drive Type: #2 Square
• Thread Type: High/Low Threads
• Point Type: Sharp Point
• Collation Type: Curved
• Coating/Finish: Gray Phosphate Coating
• 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

What's Included

• 2,500 Simpson Strong-Drive MTH Wood Underlayment Screws (#7 x 1-1/4 in.)
• #2 square drive bit (model BIT2S)

Frequently Asked Questions

What is the purpose of the high-low thread pattern on the MTH114S screw?

The high-low thread pattern is specifically designed to prevent squeaking by holding underlayment tight to the subfloor, thereby preventing pull-out and maintaining a secure, stable installation over time.

What tool is compatible with these collated underlayment screws?

The MTH114S installs with the Simpson Strong-Tie Quik Drive PRO200SG2 auto-feed screw driving system or attachment, enabling fast and consistent installation across large areas.

Is the gray phosphate coating suitable for all installation environments?

The gray phosphate coating is recommended for dry, low-corrosion environments. It is not intended for use in wet, humid, or high-corrosion conditions.

Does the MTH114S trim head affect the finished floor surface?

Yes - the compact trim head with nibs is designed for easy countersinking, providing a flush surface that prevents floor coverings from settling into countersink recesses for a smooth, professional finish.

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