The Simpson 1/2 in. Lipped Drop-In Internally Threaded Anchor from Simpson is a displacement-controlled expansion anchor engineered for fast, accurate installation into concrete and masonry base materials. Featuring improved geometry for smooth and consistent placement, this internally threaded drop-in anchor requires minimum effort to set and includes a positive-set marking system that confirms proper placement - making it a reliable and economical choice for threaded rod connections that demand a clean, flush finish.

Key Features

• Sets with 40% fewer hammer hits than previous drop-in anchor designs - reduces installation time and labor effort on the job site
• Positive-set marking system at the top of the anchor - provides clear visual confirmation that the anchor is fully and correctly set, eliminating guesswork
• Lipped design for flush installation - anchor sits level with the base material surface for a clean, professional finish ideal for exposed or finished applications
• Zinc-plated carbon steel construction - provides a corrosion-resistant finish suitable for interior concrete and masonry installations
• Compatible with dedicated setting tools - installs with DIABST hand-setting tool model DIABST50 or power-setting tool model DIABST50-SDS for consistent, repeatable results

Why This Product

• Faster, easier installation - the enhanced setting capability and improved geometry mean fewer hammer hits and less effort per anchor, helping crews work more efficiently on high-volume concrete anchoring projects
• Built-in installation confidence - the positive-set marking system takes the uncertainty out of drop-in anchor installation, ensuring every anchor is fully set before the threaded rod is engaged
• Flush, lipped finish for versatile applications - the lipped design keeps the anchor sitting at surface level, making this internally threaded anchor well suited for suspended systems, mechanical connections, and anywhere a clean surface profile matters
• Trusted Simpson engineering - the DIAB anchor reflects Simpson's focus on practical improvements over standard drop-in anchor designs, delivering a product built for accuracy, speed, and consistent field performance

Specifications

• MPN: DIABL50
• Brand: Simpson Strong-Tie
• Material: Carbon Steel
• Coating / Finish: Zinc Plated
• Length (in.): 2
• Thread Length (in.): 3/4
• TPI: 13
• Bolt/Rod Diameter (in.): 1/2
• Drill Bit Diameter (in.): 5/8
• Anchor Type: Displacement-Controlled Expansion Anchor
• Packaging: Packs of 50 and Cartons of 200

Frequently Asked Questions

What tools are required to install the Simpson Strong-Tie DIABL50 anchor?

The DIABL50 installs with the DIABST hand-setting tool model DIABST50 or the power-setting tool model DIABST50-SDS. These dedicated setting tools drive the expansion plug toward the bottom of the anchor to properly displace and set it within the base material.

How do I know when the DIABL50 anchor has been correctly set?

The DIAB anchor features a positive-set marking system located at the top of the anchor. This indication marker provides a clear visual confirmation that the anchor has been properly and fully set in the base material, eliminating guesswork during installation.

What size drill bit is required for the DIABL50 drop-in anchor?

A 5/8-in. drill bit is required to prepare the hole for the DIABL50 anchor. The anchor itself accepts a 1/2-in. threaded rod and has a thread pitch of 13 TPI with a thread length of 3/4 in.

What does "lipped" mean for the DIABL50, and why does it matter?

The lipped design of the DIABL50 allows the anchor to sit flush with the surface of the base material upon installation. This ensures a clean, level finish that is ideal for applications where a protruding anchor would interfere with the connected hardware or structural component.

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