The Simpson 3/4-in. Drop-In Internally Threaded Anchor in Type 303/304 Stainless Steel is a flush-mount expansion anchor built for solid concrete base materials where a clean, recessed finish is required. Simpson engineered this internally threaded drop-in anchor to accept 3/4-in. threaded rod, delivering consistent holding strength in demanding concrete anchoring applications. The Type 303/304 stainless steel construction - covering both the anchor body and expander plug - makes this anchor a reliable choice for corrosion-resistant installations where a surface-flush profile is essential.

Key Features

• Flush-mount expansion anchor for concrete applications - installs completely recessed so the finished surface remains clean and unobstructed, ideal for applications requiring a flush profile.
• Hand- and power-setting tools available - gives installers flexible, fast, and economical installation options whether working by hand or with power equipment.
• Fixed-depth stop bit compatible - helps you drill to the correct depth every time, reducing the risk of under- or over-drilling that can compromise anchor performance.
• Accepts 3/4-in. threaded rod - mates directly with standard 3/4-in. rod or bolt, simplifying material selection and ensuring a secure, predictable connection.
• Type 303/304 Stainless Steel anchor body and expander plug - resists corrosion in environments where standard carbon steel anchors would be unsuitable, extending service life without additional coatings.
• Precise 1-in. drill bit diameter required - a correctly sized hole is critical; an oversized hole makes setting the anchor difficult and reduces load capacity, so matching the specified bit size protects your installation's integrity.

Why This Product

• Stainless steel throughout - with both the anchor body and expander plug manufactured from AISI 303 stainless steel, this drop-in anchor is built for corrosion-resistant concrete anchoring where longevity in harsh or moisture-exposed conditions matters.
• True flush-mount design - the internally threaded drop-in format sits fully recessed within the base material, making it the right choice for concrete connections that cannot tolerate protruding hardware above the surface.
• Simplified, repeatable installation - compatibility with both hand and power setting tools, combined with a fixed-depth stop bit, means consistent results across multiple anchor placements without guesswork.
• Engineered for solid concrete - designed specifically for solid base materials and 3/4-in. threaded rod attachment, this anchor fits directly into structural and mechanical concrete fastening applications without requiring adapters or modifications.

Specifications

• MPN: DIA75SS
• Brand: Simpson Strong-Tie
• Material: Type 303/304 Stainless Steel
• Finish: Type 303/304 Stainless Steel
• Bolt/Rod Diameter: 3/4 in.
• Drill Bit Diameter: 1 in.
• Length: 3-1/8 in.
• Thread Length: 1-1/4 in.
• TPI: 10
• Thread Type: UNC
• Anchor Body Material: AISI 303 - meets chemical requirements of ASTM A582
• Expander Plug Material: AISI 303
• Packaging: Packs of 20 and Cartons of 80

Approved Applications

• Flush-mount anchoring in solid concrete base materials
• Applications requiring 3/4-in. threaded rod or bolt attachment
• Corrosion-resistant installations where stainless steel is specified
• Projects requiring a recessed, surface-flush anchor profile

Frequently Asked Questions

What drill bit size is required to install the DIA75SS anchor?

A 1-in. diameter drill bit is required for proper installation of the DIA75SS. Using an oversized hole will make it difficult to set the anchor and will reduce the anchor's load capacity.

What threaded rod size is compatible with this drop-in anchor?

The DIA75SS is designed to accept a 3/4-in. diameter threaded rod. The thread specification is UNC with 10 threads per inch (TPI). Minimum thread engagement should be equal to the nominal diameter of the threaded insert.

What material is the DIA75SS anchor made from?

The anchor body and expander plug are both made from AISI 303 stainless steel. The anchor body meets the chemical requirements of ASTM A582, making it suitable for applications where corrosion resistance is a priority.

How is the DIA75SS anchor installed?

The DIA75SS can be installed using either hand-setting or power-setting tools, both of which are available for fast, easy, and economical installation. A fixed-depth stop bit is recommended to ensure the hole is drilled to the correct depth every time.

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