ASSY A2 Ecofast

Countersunk Head, Stainless Steel Self-Tapping Wood Screw
  • Code Approval
  • ICC, ETA
  • Connection Type
  • Wood/Wood, Wood/Concrete
  • Applications
  • Timber Framing, Log Home Building, Mass & Heavy Timber Construction
  • Manufacturer
  • SWG

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Countersunk Head

Shank Cutter

Counter Thread Tip


Product Description

Product Description

The ASSY A2 Stainless Steel Ecofast is a structural, corrosion-free, and self-tapping screw. The screw design reduces wood splitting while offering a precise setting without the need for pre-drilling.  Code-approved reliability, the ASSY A2 Ecofast has been awarded an ICC-ESR approval in the United States.



Diameters1/4″ (6 mm) , 5/16″ (8 mm)
Lengths2-1/4” (60 mm)  to  11-7/8” (300 mm)
  • Corrosion-free
  • Versatile countersunk head with milling pockets for a clean architectural finish
  • Aggressive tip bites into the wood and assures quick and easy installation
  • Ring thread tip reduces wood splitting and promotes precise setting
  • Suitable for ledger board to rim joist connections, and ledger board to stud wall connections

The Ecofast A2 is suitable for a broad range of projects from log home building to multi-story mass timber construction. 



SpecificationASSY A2 EcofastThread LengthAW Drive BitPackaging Qty.
# ItemMaterialHead
A2ECO0660Stainless SteelCountersunk Head1/4" x 2 3/8"6 x 601 1/2"37AW 30200
A2ECO0680Stainless SteelCountersunk Head1/4" x 3 1/8"6 x 802"50AW 30100
A2ECO06100Stainless SteelCountersunk Head1/4" x 4"6 x 1002 3/8"60AW 30100
A2ECO06120Stainless SteelCountersunk Head1/4" x 4 3/4"6 x 1202 3/4"70AW 30100
A2ECO06140Stainless SteelCountersunk Head1/4" x 5 1/2"6 x 1402 3/4"70AW 30100
A2ECO0880Stainless SteelCountersunk Head5/16" x 3 1/8"8 x 802"50AW 4075
A2ECO08100Stainless SteelCountersunk Head5/16" x 4"8 x 1002 3/8"60AW 4075
A2ECO08120Stainless SteelCountersunk Head5/16" x 4 3/4"8 x 1203 1/8"80AW 4075
A2ECO08140Stainless SteelCountersunk Head5/16" x 5 1/2"8 x 1403 1/8"80AW 4075
A2ECO08160Stainless SteelCountersunk Head5/16" x 6 1/4"8 x 1603 1/8"80AW 4075
A2ECO08180Stainless SteelCountersunk Head5/16" x 7 1/8"8 x 1803 1/8"80AW 4075
A2ECO08200Stainless SteelCountersunk Head5/16" x 7 7/8"8 x 2003 1/8"80AW 4075
A2ECO08220Stainless SteelCountersunk Head5/16" x 8 5/8"8 x 2204"100AW 4075
A2ECO08240Stainless SteelCountersunk Head5/16" x 9 1/2"8 x 2404"100AW 4075
A2ECO08260Stainless SteelCountersunk Head5/16" x 10 1/4"8 x 2604"100AW 4075
A2ECO08280Stainless SteelCountersunk Head5/16" x 11"8 x 2804"100AW 4075
A2ECO08300Stainless SteelCountersunk Head5/16" x 11 7/8"8 x 3004"100AW 4075

CAD Drawings

CAD Drawings

ProductASSY A2 Ecofast DiameterFile Extension
ASSY A2 Ecofast1/4"6
ASSY A2 Ecofast5/16"8
Design Guides

Design Guides

Structural Screw Design Guide

The most complete tool for high-capacity mass timber connections design using ICC and CCMC code approved ASSY structural fasteners.

Structural Mass Timber Fastening Design Guide

Companion to the Structural Screws Design Guide, it provides pre-designed, easy-to-read tables for tens of mass timber connections using high-capacity ASSY self-tapping screws.

Code Approvals

Code Approvals

ICC Code Approval ESR-3179 for Partially Threaded Fasteners - 2021 Edition (August)

ISO 50001 Certification for ASSY Fasteners

LA Research Report (LARR): RR 26073

Installation Instructions

Installation Instructions

Structural Fasteners Installation Guide

The structural fasteners installation guide is a practical document designed to simplify the installation process of ASSY self-tapping screws.

White Papers

White Papers

Timber Moisture Content Changes and Associated Stress Predictions on Structural Wood Screws

Substitution of Lag Screws with Wood Screws

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