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

Ring Thread Tip

Suitable in Wet Service Conditions


Product Description

Product Description

The A2 Stainless Steel Ecofast are high corrosion resistant structural fasteners suitable for use in wet service conditions & corrosive environments. These ICC-ESR approved fasteners are designed to reduce wood splitting during installation. They offer a precise setting without the need for pre-drilling [may be recommended for long models].

Made from chromium-nickel austenitic stainless steel (corrosion resistant) with low carbon content and copper addition. Considered to be equivalent to 304 stainless steel.


Diameters 1/4″ (6 mm) , 5/16″ (8 mm)
Lengths 2-1/4” (60 mm)  to  11-7/8” (300 mm)
  • Countersunk head for a clean architectural finish
  • 304 stainless steel equivalents
  • Suitable in corrosive environment
  • Suitable for use in wet service conditions
  • Aggressive ring thread tip providing the fastest fastener wood bite & installation
  • Installed with AW Bits




SpecificationASSY A2 EcofastThread LengthDrive BitPackaging Qty.
# ItemMaterialHead
A2ECO0660Stainless SteelCountersunk Head1/4 x 2 3/86 x 601 1/237AW 30200
A2ECO0680Stainless SteelCountersunk Head1/4 x 3 1/86 x 80250AW 30100
A2ECO06100Stainless SteelCountersunk Head1/4 x 46 x 1002 3/860AW 30100
A2ECO06120Stainless SteelCountersunk Head1/4 x 4 3/46 x 1202 3/470AW 30100
A2ECO06140Stainless SteelCountersunk Head1/4 x 5 1/26 x 1402 3/470AW 30100
A2ECO0880Stainless SteelCountersunk Head5/16 x 3 1/88 x 80250AW 4075
A2ECO08100Stainless SteelCountersunk Head5/16 x 48 x 1002 3/860AW 4075
A2ECO08120Stainless SteelCountersunk Head5/16 x 4 3/48 x 1203 1/880AW 4075
A2ECO08140Stainless SteelCountersunk Head5/16 x 5 1/28 x 1403 1/880AW 4075
A2ECO08160Stainless SteelCountersunk Head5/16 x 6 1/48 x 1603 1/880AW 4075
A2ECO08180Stainless SteelCountersunk Head5/16 x 7 1/88 x 1803 1/880AW 4075
A2ECO08200Stainless SteelCountersunk Head5/16 x 7 7/88 x 2003 1/880AW 4075
A2ECO08220Stainless SteelCountersunk Head5/16 x 8 5/88 x 2204100AW 4075
A2ECO08240Stainless SteelCountersunk Head5/16 x 9 1/28 x 2404100AW 4075
A2ECO08260Stainless SteelCountersunk Head5/16 x 10 1/48 x 2604100AW 4075
A2ECO08280Stainless SteelCountersunk Head5/16 x 118 x 2804100AW 4075
A2ECO08300Stainless SteelCountersunk Head5/16 x 11 7/88 x 3004100AW 4075

CAD Drawings

2D & 3D Geometry

ProductASSY A2 Ecofast Diameter File Extension
ASSY A2 Ecofast 1/46
ASSY A2 Ecofast 5/168
Design Guides

Design Guides

Structural Screw Catalog

A catalog with all information on our ICC & CCMC code-approved fasteners, including dimensions, references & design properties.

Structural Screw Connection Design Guide

Companion to the Structural Screws Catalog, it provides easy-to-read tables for the most common mass timber connections with design values & installation instructions.

Code Approvals

Code Approvals

ICC Code Approval ESR-3179 for Partially Threaded Fasteners - 2022 Edition (October)

ISO 50001 Certification for ASSY Fasteners

LA Research Report (LARR): RR 26073

White Papers

White Papers

Supplementary Considerations for the Conventional Yield Model

Screw Buckling Values for Compression Perpendicular to Grain Reinforcement

Withdrawal Resistances of ASSY Screws at Various Angles to the Grain

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

Substitution of Lag Screws with Wood Screws

Technical Blogs

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