Self-tapping Wood Screw | ASSY Ecofast

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

Diameters	1/4″ (6 mm), 5/16″ (8 mm), 3/8″ (10 mm)
Lengths	2-1/4″ (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

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

Specification	ASSY Ecofast				Thread Length		AW Drive Bit	Packaging Qty.
# Item	Material	Head Type	in.	mm	in.	mm
[3] ECO0660	Hardened Steel	Countersunk Head	1/4" x 2 3/8"	6 x 60	1 1/2"	37	AW 30	200
[3] ECO0670	Hardened Steel	Countersunk Head	1/4" x 2 3/4"	6 x 70	1 5/8"	42	AW 30	200
[3] ECO0680	Hardened Steel	Countersunk Head	1/4" x 3 1/8"	6 x 80	2"	50	AW 30	100
[3] ECO0690	Hardened Steel	Countersunk Head	1/4" x 3 1/2"	6 x 90	2"	50	AW 30	100
[3] ECO06100	Hardened Steel	Countersunk Head	1/4" x 4"	6 x 100	2 3/8"	60	AW 30	100
[3] ECO06120	Hardened Steel	Countersunk Head	1/4" x 4 3/4"	6 x 120	2 3/4"	70	AW 30	100
[3] ECO06140	Hardened Steel	Countersunk Head	1/4" x 5 1/2"	6 x 140	2 3/4"	70	AW 30	100
[3] ECO06160	Hardened Steel	Countersunk Head	1/4" x 6 1/4"	6 x 160	2 3/4"	70	AW 30	100
[3] ECO06180	Hardened Steel	Countersunk Head	1/4" x 7 1/8"	6 x 180	2 3/4"	70	AW 30	100
[3] ECO06200	Hardened Steel	Countersunk Head	1/4" x 7 7/8"	6 x 200	2 3/4"	70	AW 30	100
[3] ECO06220	Hardened Steel	Countersunk Head	1/4" x 8 5/8"	6 x 220	2 3/4"	70	AW 30	100
[3] ECO06240	Hardened Steel	Countersunk Head	1/4" x 9 1/2"	6 x 240	2 3/4"	70	AW 30	100
[3] ECO06260	Hardened Steel	Countersunk Head	1/4" x 10 1/4"	6 x 260	2 3/4"	70	AW 30	100
[3] ECO06280	Hardened Steel	Countersunk Head	1/4" x 11"	6 x 280	2 3/4"	70	AW 30	100
[3] ECO06300	Hardened Steel	Countersunk Head	1/4" x 11 7/8"	6 x 300	2 3/4"	70	AW 30	100
[3] ECO0880	Hardened Steel	Countersunk Head	5/16" x 3 1/8"	8 x 80	2"	50	AW 40	75
[3] ECO0890	Hardened Steel	Countersunk Head	5/16" x 3 1/2"	8 x 90	2 3/8"	60	AW 40	75
[3] ECO08100	Hardened Steel	Countersunk Head	5/16" x 4"	8 x 100	2 3/8"	60	AW 40	75
[3] ECO08120	Hardened Steel	Countersunk Head	5/16" x 4 3/4"	8 x 120	3 1/8"	80	AW 40	75
[3] ECO08140	Hardened Steel	Countersunk Head	5/16" x 5 1/2"	8 x 140	3 1/8"	80	AW 40	75
[3] ECO08160	Hardened Steel	Countersunk Head	5/16" x 6 1/4"	8 x 160	3 1/8"	80	AW 40	75
[3] ECO08180	Hardened Steel	Countersunk Head	5/16" x 7 1/8"	8 x 180	3 1/8"	80	AW 40	75
[3] ECO08200	Hardened Steel	Countersunk Head	5/16" x 7 7/8"	8 x 200	3 1/8"	80	AW 40	75
[3] ECO08220	Hardened Steel	Countersunk Head	5/16" x 8 5/8"	8 x 220	4"	100	AW 40	75
[3] ECO08240	Hardened Steel	Countersunk Head	5/16" x 9 1/2"	8 x 240	4"	100	AW 40	75
[3] ECO08260	Hardened Steel	Countersunk Head	5/16" x 10 1/4"	8 x 260	4"	100	AW 40	75
[3] ECO08280	Hardened Steel	Countersunk Head	5/16" x 11"	8 x 280	4"	100	AW 40	75
[3] ECO08300	Hardened Steel	Countersunk Head	5/16" x 11 7/8"	8 x 300	4"	100	AW 40	75
[3] ECO08320	Hardened Steel	Countersunk Head	5/16" x 12 5/8"	8 x 320	4"	100	AW 40	100
[3] ECO08340	Hardened Steel	Countersunk Head	5/16" x 13 3/8"	8 x 340	4"	100	AW 40	100
[3] ECO08360	Hardened Steel	Countersunk Head	5/16" x 14 1/4"	8 x 360	4"	100	AW 40	100
[3] ECO08380	Hardened Steel	Countersunk Head	5/16" x 15"	8 x 380	4"	100	AW 40	100
[3] ECO08400	Hardened Steel	Countersunk Head	5/16" x 15 3/4"	8 x 400	4"	100	AW 40	100
[3] ECO1080	Hardened Steel	Countersunk Head	3/8" x 3 1/8"	10 x 80	2"	50	AW 50	50
[3] ECO10100	Hardened Steel	Countersunk Head	3/8" x 4"	10 x 100	2 3/8"	60	AW 50	50
[3] ECO10120	Hardened Steel	Countersunk Head	3/8" x 4 3/4"	10 x 120	3 1/8"	80	AW 50	50
[3] ECO10140	Hardened Steel	Countersunk Head	3/8" x 5 1/2"	10 x 140	3 1/8"	80	AW 50	50
[3] ECO10160	Hardened Steel	Countersunk Head	3/8" x 6 1/4"	10 x 160	4"	100	AW 50	50
[3] ECO10180	Hardened Steel	Countersunk Head	3/8" x 7 1/8"	10 x 180	4"	100	AW 50	50
[3] ECO10200	Hardened Steel	Countersunk Head	3/8" x 7 7/8"	10 x 200	4"	100	AW 50	50
[3] ECO10220	Hardened Steel	Countersunk Head	3/8" x 8 5/8"	10 x 220	4"	100	AW 50	50
[3] ECO10240	Hardened Steel	Countersunk Head	3/8" x 9 1/2"	10 x 240	4"	100	AW 50	50
[3] ECO10260	Hardened Steel	Countersunk Head	3/8" x 10 1/4"	10 x 260	4"	100	AW 50	50
[3] ECO10280	Hardened Steel	Countersunk Head	3/8" x 11"	10 x 280	4"	100	AW 50	50
[3] ECO10300	Hardened Steel	Countersunk Head	3/8" x 11 7/8"	10 x 300	4"	100	AW 50	50
[3] ECO10320	Hardened Steel	Countersunk Head	3/8" x 12 5/8"	10 x 320	4 3/4"	120	AW 50	50
[3] ECO10340	Hardened Steel	Countersunk Head	3/8" x 13 3/8"	10 x 340	4 3/4"	120	AW 50	50
[3] ECO10360	Hardened Steel	Countersunk Head	3/8" x 14 1/4"	10 x 360	4 3/4"	120	AW 50	50
[3] ECO10380	Hardened Steel	Countersunk Head	3/8" x 15"	10 x 380	4 3/4"	120	AW 50	50
[3] ECO10400	Hardened Steel	Countersunk Head	3/8" x 15 3/4"	10 x 400	4 3/4"	120	AW 50	50

Product	ASSY Ecofast Diameter	File Extension
ASSY Ecofast	1/4"	6
ASSY Ecofast	5/16"	8
ASSY Ecofast	3/8"	10
All of The Above

Product

ASSY Ecofast Diameter

File Extension

in.

mm.

.DXF

ASSY Ecofast

1/4"

ASSY Ecofast

5/16"

ASSY Ecofast

3/8"

All of The Above

Structural Mass Timber Fastening Design Guide

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ASSY Ecofast

Countersunk Head Partially Threaded Self-Tapping Structural Wood Screw

Countersunk Head

Shank Cutter

Partially Threaded

Counter Thread Tip

Product Description

Features

Specifications

CAD Drawings

Design Guides

Code Approvals

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

CCMC Code Approval 13677-R

Screws ISO 50001

LA Research Report (LARR): RR 26073

Installation Instructions

White Papers

Structural Screw Technology in Tall Wood Buildings

CLT Horizontal Diaphragm Design Example

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

Substitution of Lag Screws with Wood Screws

CLT Special Provisions

4D+ Embedment Reduction Factor for Screws Loaded in Withdrawal

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