The Simpson 3/4-in. Drop-In Internally Threaded Anchor from Simpson is a displacement-controlled expansion anchor engineered for smooth and accurate installation into concrete base materials. Improved geometry in the anchor body delivers reliable performance in threaded rod anchoring applications, while an enhanced setting capability keeps installation effort low, making this drop-in anchor a practical and economical choice for both new construction and retrofit projects requiring a 3/4-in. internally threaded connection point.

Key Features

• Sets with 40% fewer hammer hits than the previous design - reduces installer fatigue and speeds up production on projects with high anchor counts
• Positive-set marking system with indication marker - gives installers immediate visual confirmation that the anchor is fully and properly set, eliminating guesswork and reducing the risk of under-set anchors
• Zinc-plated carbon steel construction - provides a corrosion-resistant finish suitable for standard interior concrete anchoring environments
• Installs with the DIABST hand-setting tool, model DIABST75 - purpose-matched tooling drives the expansion plug correctly, ensuring a consistent displacement-controlled expansion set every time
• Internally threaded for 3/4-in. threaded rod - accepts standard 3/4-in. diameter rod at 10 TPI, making it straightforward to pair with common fastening hardware

Why This Product

• Faster, lower-effort installation saves time on the job - the improved geometry and enhanced setting capability mean each anchor sets with 40% fewer hammer hits compared to the previous drop-in anchor design, directly cutting labor time when installing multiple anchors
• Built-in confirmation takes the uncertainty out of the process - the indication marker visually signals when the anchor has reached full set, so crews can move forward with confidence rather than second-guessing placement depth
• Purpose-built sizing for 3/4-in. rod applications - with a 3 1/8-in. body length, 1 1/4-in. thread length, and a precisely matched 1-in. drill bit diameter requirement, this anchor is sized and specified to work without improvisation or field modification
• Trusted materials from a recognized structural fastening brand - zinc-plated carbon steel construction from Simpson delivers the durability expected in demanding concrete anchoring conditions

Specifications

• MPN: DIAB75
• Brand: Simpson Strong-Tie
• Material: Carbon Steel
• Coating/Finish: Zinc Plated
• Length: 3-1/8 in.
• Thread Length: 1-1/4 in.
• TPI: 10
• Bolt/Rod Diameter: 3/4 in.
• Drill Bit Diameter: 1 in.
• Packaging: Packs of 20 and Cartons of 80

Frequently Asked Questions

What size threaded rod does the DIAB75 accept?

The DIAB75 is designed to accept a 3/4-in. diameter threaded rod with 10 threads per inch (TPI).

What drill bit size is required to install the DIAB75?

A 1-in. diameter drill bit is required to bore the hole for proper installation of the DIAB75 drop-in anchor.

How do I know when the DIAB75 anchor is properly set?

The DIAB75 features a positive-set marking system with an indication marker located at the top of the anchor. When this marker reaches the surface of the base material, it visually confirms that the anchor has been properly and fully set.

What setting tool is required to install the DIAB75?

The DIAB75 installs with the DIABST hand-setting tool, model DIABST75, which drives the expansion plug toward the bottom of the anchor to achieve a secure, displacement-controlled expansion set.

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