The Simpson DIA256SS DIA Type 316 Stainless-Steel Drop-In Internally Threaded Anchor by Simpson is a flush-mount expansion anchor engineered for reliable performance in concrete and other solid base materials. Designed for 1/4-in. rod applications, this internally threaded drop-in anchor delivers a clean, flush finish while providing secure, lasting hold. Constructed entirely from Type 316 stainless steel - including the anchor body, expander plug, and thread - it offers exceptional corrosion resistance in demanding environments where standard carbon steel anchors fall short.

Key Features

• Flush-mount expansion anchor for concrete applications
• Hand- and power-setting tools available for fast, easy and economical installation
• Fixed-depth stop bit helps you drill to the correct depth every time
• Rod size: 1/4 in.
• Drill bit diameter: 3/8 in.
• Length: 1 in.
• Caution: Oversized holes will make it difficult to set the anchor and will reduce the anchor's load capacity

Specifications

• MPN: DIA256SS
• Brand: Simpson
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Component Material, Anchor Body: Type 316
• Component Material, Expander Plug: Type 316
• Component Material, Thread: UNC
• Bolt/Rod Diameter: 1/4 in.
• Drill Bit Diameter: 3/8 in.
• Length: 1 in.
• Thread Length: 3/8 in.
• TPI: 20
• Packaging: Packs of 100 and Cartons of 500
• Country of Origin: Taiwan

Approved Applications

• Flush-mount anchoring in solid concrete base materials
• Applications requiring 1/4-in. threaded rod connections
• Environments where corrosion resistance is critical, such as coastal, chemical, or high-moisture settings

Frequently Asked Questions

What size drill bit is required to install the DIA256SS anchor?

A 3/8-in. drill bit is required to bore the correct hole for this anchor. Using an oversized hole will make it difficult to set the anchor and will reduce the anchor's load capacity.

What rod or bolt diameter is compatible with this drop-in anchor?

The DIA256SS is designed for use with 1/4-in. threaded rod. The minimum thread engagement should be equal to the nominal diameter of the threaded insert.

Why is Type 316 stainless steel used for this anchor?

Type 316 stainless steel is used for the anchor body, expander plug, and thread, providing superior corrosion resistance compared to standard stainless grades - making it well-suited for demanding or corrosive environments.

What setting tools are needed to install this anchor?

Both hand- and power-setting tools are available for installing the DIA256SS, offering 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.