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Drop-In (DIA) Internally Threaded Anchor

Drop-In (DIA)

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Drop-In anchors are internally threaded drop-in expansion anchors for use in flush-mount applications in solid base materials. Available in stainless steel (DIA) or short (DIAS) versions. Minimum thread engagement should be equal to the nominal diameter of the threaded insert.

Key Features

  • Lipped edge (DIAS) eliminates need for precisely drilled hole depth
  • 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
  • Short length (DIAS) enables shallow embedment to help avoid drilling into rebar or pre-stressed/post-tensioned cables
  • Short drop-in anchors include a setting tool compatible with the anchor to ensure consistent installation

Material

  • Stainless steel and carbon steel

Finish

  • Carbon steel; zinc plated

Installation

  1. Drill a hole in the base material using the appropriate diameter carbide drill bit as specified in the table. Drill the hole to the specified embedment depth plus 1/8" for flush mounting. Blow the hole clean using compressed air. Overhead installations need not be blown clean.
  2. Insert designated anchor into hole. Tap with hammer until flush against surface.
  3. Using the designated drop-in setting tool, drive expander plug toward the bottom of the anchor until shoulder of setting tool makes contact with the top of the anchor.
  4. Minimum thread engagement should be equal to the nominal diameter of the threaded insert.

Caution

  • The load tables list values based upon results from the most recent testing and may not reflect those in current code reports. Where code jurisdictions apply, consult the current reports for applicable load values.
  • Oversized holes will make it difficult to set the anchor and 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
Ficha de Datos de Seguridad para Anclas Mecánicas
SDS-MechAnchors-NA-ES
Diseñado para dar información útil en la gestión de químicos en el lugar de trabajo; p.ej. propiedades físicas; riesgos; medidas de protección; precauciones para manejo, almacenamiento y transporte.
SDS
Fiche de Données de Sécurité pour Ancrages Mécaniques
SDS-MechAnchors-NA-FRCA
Prévu pour fournir de l’information sur la gestion des produits chimiques au travail comme propriétés physiques, dangers, mesures de protection et précautions de manipulation, stockage et transport.
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 Component Material, Anchor Body Component Material, Expander Plug Component Material, Thread Box Qty. Carton Qty.
Footnotes

  1. A dedicated setting tool is included with each box of DIA37S and DIA50S.
DIA25SS Drop-In Anchor Type 303/304 Stainless Steel 3/8 1 1/4 3/8 20 AISI 303. Meets chemical requirements of ASTM A582 AISI 303 UNC 100 500
DIA37SS Drop-In Anchor Type 303/304 Stainless Steel 1/2 1 9/16 3/8 5/8 16 AISI 303. Meets chemical requirements of ASTM A582 AISI 303 UNC 50 250
DIA50SS Drop-In Anchor Type 303/304 Stainless Steel 5/8 2 1/2 3/4 13 AISI 303. Meets chemical requirements of ASTM A582 AISI 303 UNC 50 200
DIA62SS Drop-In Anchor Type 303/304 Stainless Steel 7/8 2 1/2 5/8 1 11 AISI 303. Meets chemical requirements of ASTM A582 AISI 303 UNC 25 100
DIA75SS Drop-In Anchor Type 303/304 Stainless Steel 1 3 1/8 3/4 1 1/4 10 AISI 303. Meets chemical requirements of ASTM A582 AISI 303 UNC 20 80
DIA256SS Drop-In Anchor Type 316 Stainless Steel 3/8 1 1/4 3/8 20 Type 316 Type 316 UNC 100 500
DIA376SS Drop-In Anchor Type 316 Stainless Steel 1/2 1 9/16 3/8 5/8 16 Type 316 Type 316 UNC 50 250
DIA506SS Drop-In Anchor Type 316 Stainless Steel 5/8 2 1/2 3/4 13 Type 316 Type 316 UNC 50 200
DIA37S Short Drop-In Anchor Zinc Plated / Carbon Steel 1/2 3/4 3/8 1/4 16 Meets minimum 70,000 psi tensile Meets minimum 50,000 psi tensile UNC/Coil-thread 100 500
DIA50S Short Drop-In Anchor Zinc Plated / Carbon Steel 5/8 1 1/2 5/16 13 Meets minimum 70,000 psi tensile Meets minimum 50,000 psi tensile UNC/Coil-thread 50 200

Product Information Tables

Drop-In Anchor Product Data – Stainless Steel
Rod Size (in.) Type 303/304 Stainless Model No. Type 316 Stainless Model No. Drill Bit Dia. (in.) Bolt Threads (per in.) Body Length (in.) Thread Length (in.) Quantity
Box Carton
1/4 DIA25SS DIA256SS 3/8 20 1 3/8 100 500
3/8 DIA37SS DIA376SS 1/2 16 1 9/16 5/8 50 250
1/2 DIA50SS DIA506SS 5/8 13 2 3/4 50 200
5/8 DIA62SS — 7/8 11 2 1/2 1 25 100
3/4 DIA75SS — 1 10 3 1/8 1 1/4 20 80
Short Drop-In Anchor Product Data
Rod Size (in.) Model No. Drill Bit Diameter (in.) Bolt Threads (per in.) Body Length (in.) Thread Length (in.) Quantity
Box Carton
3/8 DIA37S1 1/2 16 3/4 1/4 100 500
1/2 DIA50S1 5/8 13 1 5/16 50 200
  1. A dedicated setting tool is included with each box of DIA37S and DIA50S.
Coil-Thread Drop-In Anchor Product Data
Rod Size (in.) Carbon Steel Model No. Drill Bit Diameter (in.) Bolt Threads (per in.) Body Length (in.) Thread Length (in.) Quantity
Box Carton
1/2 DIA50C1 5/8 6 2 3/4 50 200
3/4 DIA75C1 1 5 3 1/8 1 1/4 20 80
  1. DIA50C and DIA75C accept 1/2" and 3/4" coil-thread rod, respectively.
Material Specifications
Anchor Component Component Material
Zinc Plated Carbon Steel Type 303/304 Stainless Steel Type 316 Stainless Steel
Anchor Body Meets minimum 70,000 psi tensile AISI 303. Meets chemical requirements of ASTM A582 Type 316
Expander Plug Meets minimum 50,000 psi tensile AISI 303 Type 316
Thread UNC/Coil-thread UNC UNC
Note: DIA37S, DIA50C and DIA75C are not available in stainless steel.

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT

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