The Simpson Drop-In Internally Threaded Anchor DIAB37 is a displacement-controlled expansion anchor from Simpson, engineered for fast and reliable anchoring of 3/8-in. threaded rod into concrete. Built around improved geometry for smooth and accurate installation, this internally threaded anchor features an enhanced setting capability that minimizes the effort required - making it a practical, economical solution for contractors and tradespeople handling high-volume concrete anchoring work.

Key Features

• Sets with 40% fewer hammer hits than previous drop-in anchor designs - reduces installation time and physical effort, increasing productivity on the job site
• Positive-set marking system with indication marker - confirms when the anchor has been driven to proper depth, eliminating guesswork and reducing the risk of improperly set anchors
• Improved geometry in the expansion plug - promotes smooth, accurate seating in the base material for consistent, repeatable results across every installation
• Zinc-plated carbon steel construction - provides a corrosion-resistant finish suitable for standard interior concrete anchoring applications
• Compatible with DIABST hand-setting tool or power-setting tool - gives installers the flexibility to choose manual or power-assisted setting depending on project demands

Why This Product

• Faster than previous-generation drop-in anchors - the redesigned expansion plug sets with significantly fewer hammer hits, cutting installation time and labor costs without sacrificing holding reliability
• Built-in confirmation of proper placement - the positive-set marking system removes uncertainty from the installation process, helping ensure every anchor meets placement requirements before the job moves forward
• Versatile setting options - compatibility with both a hand-setting tool and a power-setting tool means this anchor adapts to different crew setups and production environments
• Designed for efficiency at scale - the combination of reduced setting effort, clear placement feedback, and consistent anchor geometry makes this drop-in anchor a dependable choice for projects requiring a large number of threaded rod connections in concrete

Specifications

• Manufacturer: Simpson Strong-Tie
• MPN: DIAB37
• Material: Carbon Steel
• Coating / Finish: Zinc Plated
• Bolt / Rod Diameter: 3/8 in.
• Length: 1-9/16 in.
• Thread Length: 5/8 in.
• TPI: 16
• Drill Bit Diameter: 1/2 in.
• Packaging: Packs of 50 and Cartons of 250

Frequently Asked Questions

What size threaded rod does the DIAB37 anchor accept?

The DIAB37 is designed for use with 3/8-in. diameter threaded rod. It features 16 TPI (threads per inch) internal threading with a thread length of 5/8 in.

What drill bit size is required to install the DIAB37 drop-in anchor?

Installation requires a 1/2-in. diameter drill bit to prepare the hole in the base material prior to setting the anchor.

What tools are needed to properly set the DIAB37 anchor?

The DIAB37 installs with the DIABST hand-setting tool model DIABST37 or the power-setting tool model DIABST37-SDS. The anchor is set by driving the expansion plug toward the bottom of the anchor using one of these setting tools.

How do I know when the DIAB37 anchor is properly installed?

The DIAB37 features a positive-set marking system with an indication marker located at the top of the anchor. When the anchor has been driven to the correct depth, this marker becomes visible, confirming that proper placement and full expansion have been achieved.

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