Key Features

Built for Underlayment This collated wood screw is made specifically for fastening wood underlayment to wood. That means faster floor prep and a tighter hold than trying to get by with a general-purpose screw. Flush, Clean Finish The trim head uses nibs to help countersink cleanly, so the fastener sits down without leaving a proud head. That matters when you want a smoother surface under finished flooring. Feeds Fast Curved collation keeps installation moving in compatible Quik Drive tools, while the sharp point and high-low threads help the screw start quickly and pull materials together with less hassle.

Overview

The Simpson Strong-Tie MTH114S Strong-Drive MTH Wood Underlayment Screw is a collated wood underlayment screw for fastening wood underlayment to wood subfloors. This is a collated wood screw designed for wood underlayment to wood installation. Model Number: MTH114S. If you are working on flooring prep, subfloor overlay, or modular construction where speed and a flush finish matter, this screw is built for that job.

At the business end, Simpson uses a sharp point to get the screw started quickly, plus high-low threads to pull the underlayment down tight. That tighter pull matters because underlayment work is not just about holding sheets in place. It is about reducing movement between layers, which helps cut down on the squeaks and pull-out problems that can show up later under finished flooring.

The head design is what separates this fastener from a basic wood screw. The trim head includes nibs for easier countersinking, so the screw can finish more cleanly at the surface instead of leaving a proud head that telegraphs through floor coverings. For underlayment work, that is a real advantage because a flatter finished surface gives you a better base for vinyl, laminate, engineered flooring, or other finish materials that do not forgive bumps.

This MTH fastener also uses curved collation for use with the Quik Drive system. In plain terms, that means it is set up for fast repeated driving with a compatible collated screw tool instead of loading loose screws one at a time. On larger jobs, that saves time, keeps spacing consistent, and makes the whole fastening process more efficient than hand-driving individual screws.

The screw itself is a #7 x 1-1/4 in. gray phosphate collated fastener with a Square #2 drive, trim head, and sharp point. Gray phosphate coating is commonly used for interior applications, which lines up with the intended use here. This is not a general exterior deck screw pretending to be an underlayment fastener. It is a purpose-built interior flooring screw meant to do one job well.

Compatibility is straightforward. Simpson lists the MTH114S for use with the Quik Drive PRO200SG2, and supplementary load-table data also references PRO200 and PRO200S compatible Quik Drive tools. If you already run the Quik Drive fastening platform, this screw drops right into that workflow. A driver bit is also listed as included in each box, with replacement bit model BIT2S.

The pack size is another reason this product makes sense for production work. With 2,500 collated screws per box, the Simpson Strong-Tie MTH114S Strong-Drive MTH Wood Underlayment Screw is aimed at contractors, remodelers, flooring installers, and serious DIY users doing full-room or full-level installs, not a tiny patch repair. If you need repeatable fastening, good pull-down, and a head that finishes clean in underlayment, this is the right style of screw for the job.

Designed to Sit Clean in Underlayment

This screw is made for the kind of fastening where surface quality matters as much as holding power. The trim head and countersinking nibs help the fastener finish lower and cleaner, which is exactly what you want before finished flooring goes down.

• Trim head with nibs for easier countersinking
• Made for wood underlayment to wood applications

Square Drive for Positive Engagement

A good drive recess sounds simple, but it matters when you are running a lot of fasteners. The Square #2 drive gives solid bit engagement so the screw is easier to control during repeated installation.

• Square #2 drive type
• Replacement driver bit model: BIT2S

Fast Starts and Strong Pull-Down

The thread and point geometry are set up for practical jobsite speed. A sharp point gets into the material quickly, and the high-low threads help draw the underlayment tight to the subfloor for a more secure finished assembly.

• Sharp point for quick penetration
• High-low threads help improve grip and material pull-down

What’s in the Box

• (2,500) Simpson Strong-Tie MTH114S #7 x 1-1/4 in. gray phosphate collated wood underlayment screws
• (1) Square #2 driver bit

Designed for use with compatible Quik Drive collated screw tools.

Key Specifications

Compatibility

Compatible Quik Drive Tools Listed for use with Quik Drive PRO200SG2. Supplementary load-table data also references PRO200 and PRO200S compatible tools. Driver Bit Uses a Square #2 driver bit. Replacement bit model: BIT2S. Fastening Application Designed specifically for wood underlayment to wood installation.

Built For

Floor underlayment installation Subfloor overlay work Carpentry Remodeling General Contracting Factory-built / modular construction

Pro Tip

Set your driver depth so the trim head finishes flush, not buried. That lets the countersinking nibs do their job and helps keep the underlayment surface cleaner for the finished floor that comes next.

Tool Nut’s Take

Tool Nut’s Take

Why the Simpson Strong-Tie MTH114S Strong-Drive MTH Wood Underlayment Screw earns its keep

This is the right screw when you need to fasten underlayment quickly, pull it down tight, and leave a cleaner surface for finished flooring.

• Who it’s for: Flooring installers, remodelers, carpenters, and contractors using the Quik Drive system for underlayment-to-subfloor work.
• Why it stands out: The trim head, countersinking nibs, high-low threads, and collated format all serve the same goal: fast installation with a flatter finished surface.
• Worth knowing: This is an interior underlayment fastener with gray phosphate coating, and it is meant for compatible Quik Drive tools rather than loose-screw general use.

Common Questions

• What is this screw designed to fasten? It is designed for wood underlayment to wood applications.
• What drive type does it use? It uses a Square #2 drive.
• Is this a collated screw? Yes. It is a Quik Drive collated screw with curved collation for compatible Quik Drive fastening tools.
• What tool platform is it compatible with? Simpson lists compatibility with the Quik Drive PRO200SG2, and supplementary load-table data also references PRO200 and PRO200S tools.
• How many screws come in the box? The MTH114S package quantity is 2,500 screws.