The Simpson DIA62SS Type 303/304 Stainless-Steel Drop-In Internally Threaded Anchor is a flush-mount expansion anchor built for solid concrete base materials where a clean, recessed connection point is required. Internally threaded for 5/8-in. threaded rod at 11 TPI (UNC), this drop-in anchor seats flush with the surface after setting, leaving no hardware above the plane of the concrete. The anchor body and expander plug are both constructed from AISI 303 stainless steel - meeting the chemical requirements of ASTM A582 - making this anchor a dependable choice for installations where corrosion resistance is a priority.

Key Features

• Flush-mount design for concrete applications - the anchor sets fully recessed so the finished surface remains clean and unobstructed, ideal for overhead, wall, and slab installations.
• Compatible with hand- and power-setting tools - gives installers the flexibility to use the method that best suits the jobsite, speeding up installation and reducing labor costs.
• Fixed-depth stop bit compatibility - drilling to the correct depth every time reduces the risk of undersetting or oversetting the anchor, protecting load capacity and installation quality.
• 7/8-in. drill bit diameter required - a precise hole-size requirement helps maintain proper anchor expansion and consistent holding strength; oversized holes reduce load capacity and make setting more difficult.
• 5/8-in. rod size with 1-in. thread length at 11 TPI (UNC) - thread specifications are matched to standard 5/8-in. threaded rod, with minimum thread engagement equal to the nominal diameter of the threaded insert for a reliable connection.
• 2 1/2-in. overall anchor length - provides adequate embedment depth in concrete for applications where structural integrity and load-bearing performance are critical.

Why This Product

• Corrosion-resistant stainless-steel construction - with both the anchor body and expander plug made from AISI 303 stainless steel meeting ASTM A582 chemical requirements, this anchor is well suited for damp, wet, or chemically exposed environments where carbon steel anchors would be a liability.
• Flush-mount finish for professional installations - because the anchor sets entirely within the base material, it works seamlessly in applications where a surface-level or below-surface anchor point is required, with no protruding hardware to interfere with fixtures, formwork, or finishes.
• Precision-fit system that protects load capacity - the anchor's strict drill-bit diameter and depth requirements, supported by fixed-depth stop bit tooling, mean that when installed correctly the anchor performs as engineered - reducing the guesswork that leads to compromised connections on the job.
• Internally threaded for direct rod connection - the UNC internal thread accepts 5/8-in. threaded rod without the need for additional hardware, simplifying the connection detail for mechanical, structural, and utility hanging applications in concrete.

Specifications

• MPN: DIA62SS
• Material: Type 303/304 Stainless Steel
• Finish: Type 303/304 Stainless Steel
• Anchor Body: AISI 303 - meets chemical requirements of ASTM A582
• Expander Plug: AISI 303
• Thread Type: UNC
• Bolt/Rod Diameter: 5/8 in.
• Drill Bit Diameter: 7/8 in.
• Length: 2-1/2 in.
• Thread Length: 1 in.
• TPI: 11
• Packaging: Packs of 25 and Cartons of 100

Approved Applications

• Flush-mount anchoring in solid concrete base materials
• Applications requiring internally threaded anchor points for 5/8-in. threaded rod
• Installations where a flush surface finish is required after anchor setting

Frequently Asked Questions

What rod size is compatible with the DIA62SS drop-in anchor?

The DIA62SS is designed for use with 5/8-in. threaded rod. Minimum thread engagement should be equal to the nominal diameter of the threaded insert.

What drill bit diameter is required to install this anchor?

A 7/8-in. drill bit is required. Using a fixed-depth stop bit is recommended to help ensure you drill to the correct depth every time. Caution: Oversized holes will make it difficult to set the anchor and will reduce the anchor's load capacity.

What base materials is the DIA62SS anchor suitable for?

This drop-in anchor is designed for use in solid base materials, specifically concrete applications where a flush-mount installation is required.

What material is the DIA62SS anchor made from, and why does it matter?

The anchor body and expander plug are both constructed from AISI 303 stainless steel, which meets the chemical requirements of ASTM A582. The Type 303/304 stainless-steel construction provides enhanced corrosion resistance compared to carbon steel alternatives, making it well suited for environments where moisture or corrosive conditions are a concern.

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