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Drop-In (DIAB) Internally Threaded Anchor

Drop-In (DIAB)

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Simpson Strong-Tie introduces a redesigned Drop-In anchor (DIAB) that provides easier installation into base materials. Improved geometry in the preassembled expansion plug improves setting capability so the anchor installs with 40% fewer hammer strikes than previous versions. These displacement-controlled expansion anchors are easily set by driving the plug toward the bottom of the anchor using either the hand- or power-setting tools. DIAB anchors feature a positive-set marking indicator at the top of the anchor — helping you see more clearly when proper installation has taken place.

Use a Simpson Strong-Tie fixed-depth stop bit to take the guesswork out of drilling to the correct depth. The fluted design of the tip draws debris away from the hole during drilling, allowing for a cleaner installation.

Key Features

  • New design offers easier installation than previous drop-in anchor design — sets with 40% fewer hammer hits
  • Positive-set marking system indicates when anchor is properly set
  • Lipped drop-in version available for flush installation
  • Hand- and power-setting tools available for fast, easy and economical installation
  • Fixed-depth stop bit helps you drill to the correct depth every time
  • Available in coil-thread version for 1/2" and 3/4" coil-thread rod

Material

  • Carbon steel

Finish

  • Zinc plated

Installation

DIAB Manual Installation

  1. Drill a hole in the base material using the appropriate diameter carbide drill bit or fixed-depth bit as specified in the table. Drill the hole to the specified embedment. For fixed-depth bits drill the hole until the shoulder of the bit contacts the surface of the base material. Then blow the hole clean of dust and debris using compressed air. Overhead installations need not be blown clean.
  2. Insert the anchor into the hole. Tap with hammer until flush against the surface.
  3. Using the designated Drop-In setting tool, drive expander plug towards the bottom of the anchor until the shoulder of the setting tool makes contact with the top of the anchor. When properly set, four indentations will be visible on the top of the anchor indicating full expansion.
  4. Insert bolt or threaded rod. Minimum thread engagement should be equal to the nominal diameter of the threaded insert.

DIAB SDS Installation

  1. Drill a hole in the base material using the appropriate diameter carbide drill bit or fixed-depth bit as specified in the table. Drill the hole to the specified embedment. For fixed-depth bits drill the hole until the shoulder of the bit contacts the surface of the base material. Then blow the hole clean of dust and debris using compressed air. Overhead installations need not be blown clean.
  2. Insert the anchor into the hole. Tap with hammer until flush against the surface.
  3. Attach the SDS Drop-In setting tool to a drill. Drive expander plug towards the bottom of the anchor using only hammer mode until the shoulder of the setting tool makes contact with the top of the anchor. When properly set, four indentations will be visible on the top of the anchor indicating full expansion.
  4. Insert bolt or threaded rod. Minimum thread engagement should be equal to the nominal diameter of the threaded insert.

Caution

  • Oversized holes will reduce the anchor's load capacity

Related Literature

2022–2025 Product Guide — Anchoring, Fastening Systems and Restoration Solutions for Concrete and Masonry
S-A-PG22
A product guide providing information on Simpson Strong-Tie® anchoring adhesives, mechanical anchors, direct fastening, carbide drill bits and restoration products for concrete and masonry.
Product Guide
Anchoring, Fastening, Restoration and Strengthening Systems for Concrete and Masonry
C-A-2021
An informative and comprehensive catalog of products belonging to our anchoring, fastening, restoration and strengthening systems for concrete and masonry.
Catalog
Sistemas de anclaje, sujeción, restauración y fortalecimiento para concreto y mampostería
C-A-2021SP
Un catálogo completo de productos e información para los sistemas de anclaje, sujeción, restauración y fortalecimiento para concreto y mampostería.
Catalog
Tension Performance of Post-Installed Anchors Adjacent to Abandoned Holes
L-A-ABANHOLE21
This letter is intended to address the performance of Simpson Strong-Tie® post-installed concrete anchors in normal-weight concrete when installed adjacent to holes that have been abandoned.
Engineering Letter
Safety Data Sheet for Mechanical Anchors
SDS-MechAnchors-NA-ENG-0520
Intended to provide information for use in workplace chemical management; information such as physical properties; hazards; protective measures; precautions for handling, storing, and transportation.
SDS

Product Information Table

Fastener Production Information and Stuff & Things
Model No. Description Coating/Material Drill Bit Dia. (in.) Length (in.) Rod Dia. (in.) Thread Length (in.) TPI Box Qty. Carton Qty.
Footnotes
  1. DIAB50C and DIAB75C accept 1/2" and 3/4" coil-thread rod, respectively.
DIAB25 Drop-In Anchor Zinc Plated / Carbon Steel 3/8 1 1/4 3/8 20 100 500
DIAB37 Drop-In Anchor Zinc Plated / Carbon Steel 1/2 1 9/16 3/8 5/8 16 50 250
DIAB50 Drop-In Anchor Zinc Plated / Carbon Steel 5/8 2 1/2 3/4 13 50 200
DIAB62 Drop-In Anchor Zinc Plated / Carbon Steel 7/8 2 1/2 5/8 1 11 25 100
DIAB75 Drop-In Anchor Zinc Plated / Carbon Steel 1 3 1/8 3/4 1 1/4 10 20 80
DIAB50C Coil-Thread Drop-In Anchor Zinc Plated / Carbon Steel 5/8 2 1/2 3/4 6 50 200
DIAB75C Coil-Thread Drop-In Anchor Zinc Plated / Carbon Steel 1 3 1/8 3/4 1 1/4 4 1/2 20 80
DIABL25 Lipped Drop-In Anchor Zinc Plated / Carbon Steel 3/8 1 1/4 3/8 20 100 500
DIABL37 Lipped Drop-In Anchor Zinc Plated / Carbon Steel 1/2 1 9/16 3/8 5/8 16 50 250
DIABL50 Lipped Drop-In Anchor Zinc Plated / Carbon Steel 5/8 2 1/2 3/4 13 50 200

Product Information Tables

Drop-in Anchor
Rod Size (in.) Model No. Drill Bit Dia. (in.) Bolt Threads (per in.) Body Length (in.) Thread Length (in.) Quantity
Box Carton
1/4 DIAB25 3/8 20 1 3/8 100 500
3/8 DIAB37 1/2 16 1 9/16 5/8 50 250
1/2 DIAB50 5/8 13 2 3/4 50 200
5/8 DIAB62 7/8 11 2 1/2 1 25 100
3/4 DIAB75 1 10 3 1/8 1 1/4 20 80
Lipped Drop-In Anchor
Rod Size (in.) Model No. Drill Bit Dia. (in.) Bolt Threads (per in.) Body Length (in.) Thread Length (in.) Quantity
Box Carton
1/4 DIABL25 3/8 20 1 3/8 100 500
3/8 DIABL37 1/2 16 1 9/16 5/8 50 250
1/2 DIABL50 5/8 13 2 3/4 50 200
Coil-Thread Drop-In Anchor
Rod Size (in.) Model No. Drill Bit Dia. (in.) Bolt Threads (per in.) Body Length (in.) Thread Length (in.) Quantity
Box Carton
1/2 DIAB50C 5/8 6 2 3/4 50 200
3/4 DIAB75C 1 5 3 1/8 1 1/4 20 80

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT

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