The Simpson Lipped Drop-In Internally Threaded Anchor is a displacement-controlled expansion anchor engineered by Simpson for fast, reliable flush mounting into concrete and masonry base materials. Featuring improved geometry for smooth and accurate placement, this internally threaded anchor accepts a 3/8-in. threaded rod or bolt and is built from zinc-plated carbon steel for durability in demanding applications. A positive-set marking system takes the guesswork out of installation, while the enhanced setting capability means less effort and more consistent results across every hole - making this drop-in anchor a practical choice for contractors and installers who need speed and confidence on the job.

Key Features

• Sets with 40% fewer hammer hits than previous drop-in anchor designs - reduces installation time and fatigue, allowing crews to move faster through high-volume anchoring tasks
• Positive-set marking system - provides a clear visual confirmation that the anchor is properly set, eliminating guesswork and reducing the risk of under-driven anchors in the field
• Lipped design for flush installation - the lip seats against the surface of the base material, keeping the anchor consistently positioned and the finished surface clean and level
• Zinc-plated carbon steel construction - delivers corrosion resistance suitable for interior concrete and masonry applications while maintaining the structural integrity of the connection
• Compatible with both hand-setting and power-setting tools - installs with the DIABST hand-setting tool model DIABST37 or the power-setting tool model DIABST37-SDS, giving installers flexibility based on job conditions

Why This Product

• Engineered for faster, lower-effort installation - the improved geometry and enhanced setting capability mean the anchor drives home with fewer hammer hits, cutting labor time without sacrificing holding performance in concrete or masonry
• Built-in confirmation takes the guesswork out of setting - the positive-set marking system gives installers an immediate, visible indication of proper placement, reducing the chance of costly installation errors on structural and general-purpose anchoring jobs
• Flush-fit design suits finished and surface-sensitive applications - the lipped profile keeps the anchor seated at the surface level, making this internally threaded anchor well-suited for applications where a clean, flush finish is required
• Versatile tool compatibility supports any workflow - whether using a manual approach or a power tool, the anchor is designed to work with dedicated Simpson setting tools, so installers can adapt to the pace and scale of any project

Specifications

• Manufacturer: Simpson Strong-Tie
• MPN: DIABL37
• Material: Carbon Steel
• Coating / Finish: Zinc Plated
• Length: 1-9/16 in.
• Thread Length: 5/8 in.
• TPI: 16
• Bolt / Rod Diameter: 3/8 in.
• Drill Bit Diameter: 1/2 in.
• Packaging: Packs of 50 and Cartons of 250

Frequently Asked Questions

How do I know when the DIABL37 anchor is properly set?

The DIABL37 features a positive-set marking system located at the top of the anchor. Once the anchor is driven to the correct depth, the marking indicator becomes visible, confirming that proper installation has taken place - eliminating guesswork on the job site.

What tools are required to install the DIABL37 drop-in anchor?

The DIABL37 installs with the DIABST hand-setting tool model DIABST37 or the power-setting tool model DIABST37-SDS. These setting tools drive the expansion plug toward the bottom of the anchor to complete the displacement-controlled expansion process.

What drill bit size is needed to install the DIABL37 anchor?

A 1/2-in. diameter drill bit is required to create the correct hole size for the DIABL37 anchor. This ensures a proper fit and optimal expansion within the base material.

What rod or bolt size is compatible with the DIABL37 internally threaded anchor?

The DIABL37 is designed to accept a 3/8-in. diameter threaded rod or bolt. The anchor features 3/8-in. internal threading with 16 TPI (threads per inch) and a 5/8-in. thread length to provide a secure connection.

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