The Simpson Drop-In Internally Threaded Anchor in Type 316 Stainless Steel is a flush-mount expansion anchor engineered for secure, permanent fastening in solid concrete base materials. Internally threaded to accept 3/8-in. threaded rod, this drop-in anchor delivers a clean, flush surface finish ideal for concrete anchoring applications where corrosion resistance and consistent load performance are critical. Whether you are connecting threaded rod overhead or at standard orientation, this Simpson anchor provides a reliable, professional-grade solution built from Type 316 stainless steel throughout - body and expander plug alike.

Key Features

• Flush-mount expansion anchor for concrete applications - installs flush with the surface for a clean finish and unobstructed connections in solid concrete base materials.
• Hand- and power-setting tools available - gives installers flexibility to set anchors quickly, easily, and economically using the method that fits the job.
• Fixed-depth stop bit compatibility - helps you drill to the correct depth every time, reducing the risk of under- or over-drilling and ensuring consistent anchor performance.
• Designed for 3/8-in. threaded rod - the internally threaded body with 16 TPI UNC threading provides a positive, secure engagement with standard 3/8-in. rod.
• Requires a 1/2-in. drill bit - a precisely matched hole diameter is essential; oversized holes will make it difficult to set the anchor and will reduce the anchor's load capacity.
• Type 316 stainless steel construction throughout - both the anchor body and expander plug are Type 316 stainless steel, providing superior corrosion resistance for demanding or moisture-exposed environments.

Why This Product

• Full Type 316 stainless steel construction - with both the anchor body and expander plug manufactured from Type 316 stainless steel, this anchor is well-suited for corrosive or high-moisture environments where standard carbon steel anchors would be at risk of degradation.
• Flush-mount design for professional results - the drop-in installation method leaves the anchor seated flush with the concrete surface, keeping connections clean and unobtrusive - an important advantage in finished or visible installations.
• Consistent, repeatable installation - compatibility with fixed-depth stop bits and both hand- and power-setting tools means installers can achieve accurate, reliable results across multiple anchors without guesswork.
• Engineered for solid concrete with proper thread engagement - the internally threaded design with a 5/8-in. thread length and minimum thread engagement equal to the nominal diameter of the threaded insert ensures a strong, dependable mechanical connection in solid concrete base materials.

Specifications

• MPN: DIA376SS
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Bolt/Rod Diameter: 3/8 in.
• Length: 1-9/16 in.
• Thread Length: 5/8 in.
• Drill Bit Diameter: 1/2 in.
• TPI: 16
• Thread Type: UNC
• Anchor Body Material: Type 316 Stainless Steel
• Expander Plug Material: Type 316 Stainless Steel
• Packaging: Packs of 50 and Cartons of 250

Approved Applications

• Flush-mount fastening in solid concrete base materials
• Applications requiring 3/8-in. threaded rod connections
• Installations demanding Type 316 stainless steel corrosion resistance
• Overhead and standard concrete anchoring where a flush surface finish is required

Frequently Asked Questions

What size drill bit is required to install the DIA376SS drop-in anchor?

The DIA376SS requires a 1/2-in. drill bit for proper installation. Using an oversized hole will make it difficult to set the anchor and will reduce the anchor's load capacity, so drilling to the correct diameter is essential.

What threaded rod size is compatible with the DIA376SS?

The DIA376SS is designed to accept 3/8-in. threaded rod. The thread specification is UNC with 16 threads per inch (TPI), and the thread length is 5/8 in. Minimum thread engagement should be equal to the nominal diameter of the threaded insert.

What base materials is the DIA376SS drop-in anchor approved for use in?

The DIA376SS is an internally threaded drop-in expansion anchor intended for use in solid base materials, specifically solid concrete. It is not intended for use in hollow or lightweight masonry materials.

What installation tools are compatible with the DIA376SS?

Both hand- and power-setting tools are available for installing the DIA376SS, allowing for fast, easy, and economical installation. A fixed-depth stop bit is also available to help ensure the hole is drilled to the correct depth every time.

Note: Product dimensions may differ from picture. Please see item description for specifications.