Simpson DIAB Drop-In Internally Threaded Coil-Thread Anchor for 3/4-in. Rod is a displacement-controlled expansion anchor engineered by Simpson for fast, accurate installation into concrete base materials. Featuring improved geometry for smooth and precise placement, this internally threaded drop-in anchor sets with 40% fewer hammer hits than previous designs - reducing labor effort while delivering consistent, reliable results. A built-in indication marker confirms proper anchor placement, taking the guesswork out of installation for contractors and tradespeople working with 3/4-in. coil-thread rod.

Key Features

• Sets with 40% fewer hammer hits than previous drop-in anchor design - faster, less-fatiguing installation that saves time and effort on the job site
• Positive-set marking system with indication marker - visually confirms when the anchor is properly and fully set, reducing costly errors and rework
• Internal coil-thread design for 3/4-in. coil-thread rod - ensures a secure, compatible connection with the correct rod type for dependable load transfer
• Zinc-plated carbon steel construction - provides corrosion resistance suitable for interior concrete anchoring applications
• Requires a 1-in. drill bit for hole preparation - clearly defined bit size ensures the correct hole diameter for proper anchor expansion and seating
• Installs with DIABST hand-setting tool model DIABST75 - purpose-built tooling drives controlled expansion for consistent, repeatable results across every anchor set

Why This Product

• Engineered for speed without sacrificing accuracy - the improved anchor geometry delivers displacement-controlled expansion in significantly fewer hammer hits than previous designs, helping crews move through concrete anchoring tasks more efficiently
• Built-in confirmation of proper set - the positive-set marking system gives installers a clear, reliable signal that each anchor is fully seated, reducing the risk of under-set anchors and the rework that follows
• Purpose-matched threading for coil-thread applications - the internal coil-thread profile is specifically designed for 3/4-in. coil-thread rod, making this anchor the right fit for suspended systems and other coil-thread rod installations rather than a generic alternative
• A trusted Simpson anchor with a streamlined install process - the combination of improved geometry, indicator-based verification, and compatibility with a dedicated hand-setting tool makes this drop-in anchor a practical, economical choice for repetitive concrete fastening work

Specifications

• MPN: DIAB75C
• Brand: Simpson Strong-Tie
• Material: Carbon Steel
• Coating / Finish: Zinc Plated
• Length (in.): 3-1/8
• Thread Length (in.): 1-1/4
• TPI: 4-1/2
• Bolt / Rod Diameter (in.): 3/4
• Drill Bit Diameter (in.): 1
• Packaging: Packs of 20 and Cartons of 80

Install With

• Simpson Strong-Tie DIAB75C Drop-In Coil-Thread Anchors
• Installs with DIABST hand-setting tool model DIABST75 (sold separately)

Frequently Asked Questions

What type of rod is the DIAB75C compatible with?

The DIAB75C is designed for use with 3/4 in. coil-thread rod, featuring internal coil-thread geometry to ensure a secure and compatible connection.

What drill bit size is required to install the DIAB75C?

Installation of the DIAB75C requires a 1 in. diameter drill bit to properly prepare the hole in the base material.

How do I know when the DIAB75C anchor is properly set?

The DIAB75C features a positive-set marking system - an indication marker located at the top of the anchor that clearly confirms when the anchor has been properly and fully set.

What tool is used to install the DIAB75C drop-in anchor?

The DIAB75C installs with the DIABST hand-setting tool, model DIABST75, which drives the expansion plug toward the bottom of the anchor to achieve proper displacement-controlled expansion.

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