The Simpson Drop-In Internally Threaded Anchor in Type 316 Stainless Steel is a flush-mount expansion anchor engineered for reliable, high-integrity connections in solid concrete base materials. Internally threaded to accept 1/2-in. threaded rod, this drop-in anchor is built for flush-mount applications where a clean, surface-level finish is required. With all components - anchor body, expander plug, and threads - constructed entirely from Type 316 stainless steel, this anchor is well suited for concrete installations exposed to moisture, chemicals, or other corrosive conditions where long-term performance is essential.

Key Features

• Flush-mount expansion anchor design - sits fully recessed in concrete for a clean, unobtrusive finish that works with surface-level installation requirements
• Internally threaded drop-in construction - accepts 1/2-in. threaded rod directly, eliminating the need for exposed hardware above the surface
• Compatible with hand- and power-setting tools - gives installers the flexibility to choose the method that fits the job, reducing installation time and labor cost
• Fixed-depth stop bit compatibility - helps ensure the hole is drilled to the precise required depth every time, reducing the risk of improper setting that could compromise holding performance
• All-Type 316 stainless steel construction - anchor body and expander plug are both Type 316 stainless steel, providing consistent corrosion resistance throughout every component, not just the exterior
• Requires a 5/8-in. drill bit for installation - using the correct bit diameter is critical to achieving proper anchor expansion and rated load capacity; oversized holes reduce holding strength

Why This Product

• Corrosion resistance you can count on throughout the entire anchor - because the anchor body, expander plug, and threads are all Type 316 stainless steel, there are no weaker mixed-material components that could corrode first in wet or chemically active environments
• Purpose-built for flush concrete applications - the internally threaded drop-in design is specifically engineered for solid base materials where a flush surface mount is required, making it the right tool for the job rather than a general-purpose compromise
• Installation accuracy is built into the system - fixed-depth stop bit compatibility and compatibility with both hand and power setting tools give contractors the support they need to install anchors correctly and consistently, job after job
• Trusted Simpson engineering for demanding concrete connections - designed with minimum thread engagement equal to the nominal diameter of the threaded insert, this anchor meets the performance expectations of structural and mechanical concrete anchoring work

Specifications

• Manufacturer Part Number (MPN): DIA506SS
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Rod/Bolt Diameter: 1/2 in.
• Length: 2 in.
• Thread Length: 3/4 in.
• TPI: 13
• Thread Type: UNC
• Drill Bit Diameter: 5/8 in.
• Anchor Body Material: Type 316 Stainless Steel
• Expander Plug Material: Type 316 Stainless Steel
• Packaging: Packs of 50 and Cartons of 200

Frequently Asked Questions

What size threaded rod is this anchor designed for?

This anchor is designed for use with 1/2-in. threaded rod. The minimum thread engagement should be equal to the nominal diameter of the threaded insert.

What drill bit diameter is required to install the DIA506SS?

A 5/8-in. drill bit is required for proper installation. Using an oversized hole will make it difficult to set the anchor and will reduce the anchor's load capacity.

Why is Type 316 stainless steel used for this anchor?

Type 316 stainless steel is used for all components - the anchor body, expander plug, and thread - to provide enhanced resistance to corrosion, making this anchor suitable for applications where exposure to moisture or harsh conditions is a concern.

What setting tools are compatible with this anchor?

Both hand-setting and power-setting tools are available for installation, offering fast, easy, and economical options. 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.