ASSY Ecofast

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

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Countersunk Head

Shank Cutter

Partially Threaded

Counter Thread Tip

Product Description

Product Description

The ASSY Ecofast is a partially threaded high strength self-tapping structural wood screw with a countersunk head designed for engineered wood products.  The screw design reduces wood splitting while offering a precise setting without the need for pre-drilling. 

The ASSY Ecofast screw can be used with both the 90° and 45° wedge washer. Offering Code-approved reliability, the ASSY Ecofast screw has been awarded an ICC-ESR approval in the United States and the Canadian Construction Materials Centre Reports (CCMC)  approval in Canada.  

 

Features

Diameters1/4″ (6 mm), 5/16″ (8 mm), 3/8″ (10 mm)
Lengths2-1/4″ (60 mm)  to  15-3/4” (400 mm)
  • Versatile countersunk head with milling pockets for a clean architectural finish
  • Aggressive self-tapping tip bites into the wood and assures quick and easy installation
  • Partially threaded to pull members together tightly 
  • Equipped with a shank cutter to ease installation
  • Suitable for ledger board to rim joist connections, and ledger board to stud wall connections
  • Can be used with both the 90° and 45° wedge washer
  • Ideal for Cross Laminated Timber (CLT) panel-to-panel connections 
  • For more connection examples and information see our Design Guides
  • All ASSY fasteners can participate in LEED BD+C 2.0 certification [MRc 4.1 & 4.2, 2 points possible] thanks to the percentage of post-consumer recycled steel used to manufacture them. LEED certification letter is available on request.

The range of available lengths and diameters make the Ecofast suitable for a broad range of projects from log home building to multi-story mass timber construction.

Specifications

Specifications

SpecificationASSY EcofastThread LengthAW Drive BitPackaging Qty.
# ItemMaterialHead Typein.mmin.mm
[3] ECO0660Hardened SteelCountersunk Head1/4" x 2 3/8"6 x 601 1/2"37AW 30200
[3] ECO0670Hardened SteelCountersunk Head1/4" x 2 3/4"6 x 701 5/8"42AW 30200
[3] ECO0680Hardened SteelCountersunk Head1/4" x 3 1/8"6 x 802"50AW 30100
[3] ECO0690Hardened SteelCountersunk Head1/4" x 3 1/2"6 x 902"50AW 30100
[3] ECO06100Hardened SteelCountersunk Head1/4" x 4"6 x 1002 3/8"60AW 30100
[3] ECO06120Hardened SteelCountersunk Head1/4" x 4 3/4"6 x 1202 3/4"70AW 30100
[3] ECO06140Hardened SteelCountersunk Head1/4" x 5 1/2"6 x 1402 3/4"70AW 30100
[3] ECO06160Hardened SteelCountersunk Head1/4" x 6 1/4"6 x 1602 3/4"70AW 30100
[3] ECO06180Hardened SteelCountersunk Head1/4" x 7 1/8"6 x 1802 3/4"70AW 30100
[3] ECO06200Hardened SteelCountersunk Head1/4" x 7 7/8"6 x 2002 3/4"70AW 30100
[3] ECO06220Hardened SteelCountersunk Head1/4" x 8 5/8"6 x 2202 3/4"70AW 30100
[3] ECO06240Hardened SteelCountersunk Head1/4" x 9 1/2"6 x 2402 3/4"70AW 30100
[3] ECO06260Hardened SteelCountersunk Head1/4" x 10 1/4"6 x 2602 3/4"70AW 30100
[3] ECO06280Hardened SteelCountersunk Head1/4" x 11"6 x 2802 3/4"70AW 30100
[3] ECO06300Hardened SteelCountersunk Head1/4" x 11 7/8"6 x 3002 3/4"70AW 30100
[3] ECO0880Hardened SteelCountersunk Head5/16" x 3 1/8"8 x 802"50AW 4075
[3] ECO0890Hardened SteelCountersunk Head5/16" x 3 1/2"8 x 902 3/8"60AW 4075
[3] ECO08100Hardened SteelCountersunk Head5/16" x 4"8 x 1002 3/8"60AW 4075
[3] ECO08120Hardened SteelCountersunk Head5/16" x 4 3/4"8 x 1203 1/8"80AW 4075
[3] ECO08140Hardened SteelCountersunk Head5/16" x 5 1/2"8 x 1403 1/8"80AW 4075
[3] ECO08160Hardened SteelCountersunk Head5/16" x 6 1/4"8 x 1603 1/8"80AW 4075
[3] ECO08180Hardened SteelCountersunk Head5/16" x 7 1/8"8 x 1803 1/8"80AW 4075
[3] ECO08200Hardened SteelCountersunk Head5/16" x 7 7/8"8 x 2003 1/8"80AW 4075
[3] ECO08220Hardened SteelCountersunk Head5/16" x 8 5/8"8 x 2204"100AW 4075
[3] ECO08240Hardened SteelCountersunk Head5/16" x 9 1/2"8 x 2404"100AW 4075
[3] ECO08260Hardened SteelCountersunk Head5/16" x 10 1/4"8 x 2604"100AW 4075
[3] ECO08280Hardened SteelCountersunk Head5/16" x 11"8 x 2804"100AW 4075
[3] ECO08300Hardened SteelCountersunk Head5/16" x 11 7/8"8 x 3004"100AW 4075
[3] ECO08320Hardened SteelCountersunk Head5/16" x 12 5/8"8 x 3204"100AW 40100
[3] ECO08340Hardened SteelCountersunk Head5/16" x 13 3/8"8 x 3404"100AW 40100
[3] ECO08360Hardened SteelCountersunk Head5/16" x 14 1/4"8 x 3604"100AW 40100
[3] ECO08380Hardened SteelCountersunk Head5/16" x 15"8 x 3804"100AW 40100
[3] ECO08400Hardened SteelCountersunk Head5/16" x 15 3/4"8 x 4004"100AW 40100
[3] ECO1080Hardened SteelCountersunk Head3/8" x 3 1/8"10 x 802"50AW 5050
[3] ECO10100Hardened SteelCountersunk Head3/8" x 4"10 x 1002 3/8"60AW 5050
[3] ECO10120Hardened SteelCountersunk Head3/8" x 4 3/4"10 x 1203 1/8"80AW 5050
[3] ECO10140Hardened SteelCountersunk Head3/8" x 5 1/2"10 x 1403 1/8"80AW 5050
[3] ECO10160Hardened SteelCountersunk Head3/8" x 6 1/4"10 x 1604"100AW 5050
[3] ECO10180Hardened SteelCountersunk Head3/8" x 7 1/8"10 x 1804"100AW 5050
[3] ECO10200Hardened SteelCountersunk Head3/8" x 7 7/8"10 x 2004"100AW 5050
[3] ECO10220Hardened SteelCountersunk Head3/8" x 8 5/8"10 x 2204"100AW 5050
[3] ECO10240Hardened SteelCountersunk Head3/8" x 9 1/2"10 x 2404"100AW 5050
[3] ECO10260Hardened SteelCountersunk Head3/8" x 10 1/4"10 x 2604"100AW 5050
[3] ECO10280Hardened SteelCountersunk Head3/8" x 11"10 x 2804"100AW 5050
[3] ECO10300Hardened SteelCountersunk Head3/8" x 11 7/8"10 x 3004"100AW 5050
[3] ECO10320Hardened SteelCountersunk Head3/8" x 12 5/8"10 x 3204 3/4"120AW 5050
[3] ECO10340Hardened SteelCountersunk Head3/8" x 13 3/8"10 x 3404 3/4"120AW 5050
[3] ECO10360Hardened SteelCountersunk Head3/8" x 14 1/4"10 x 3604 3/4"120AW 5050
[3] ECO10380Hardened SteelCountersunk Head3/8" x 15"10 x 3804 3/4"120AW 5050
[3] ECO10400Hardened SteelCountersunk Head3/8" x 15 3/4"10 x 4004 3/4"120AW 5050
CAD Drawings

CAD Drawings

ProductASSY Ecofast DiameterFile Extension
in.mm..DXF
ASSY Ecofast1/4"6
ASSY Ecofast5/16"8
ASSY Ecofast3/8"10
All of The Above
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)

CCMC Code Approval 13677-R

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

Substitution of Lag Screws with Wood Screws

CLT Special Provisions

4D+ Embedment Reduction Factor for Screws Loaded in Withdrawal

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

CLT Horizontal Diaphragm Design Example

Structural Screw Technology in Tall Wood Buildings

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