ASSY SK

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

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Washer Head

Shank Cutter

Partially Threaded

Counter Thread Tip

Product Description

Product Description

The ASSY SK Washer Head screw is an engineered self-tapping structural wood screw, with a large washer head that eliminates the need for an additional washer. The screw design also reduces wood splitting while offering a precise setting without the need for pre-drilling.

Code-approved reliability, the ASSY SK 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) , 1/2″ (12 mm)
Lengths1-3/4″ (50 mm)   to  39-3/8” (1000 mm)
  • Provides tremendous head pull-through capacity
  • Each increase in screw diameter also increases the screw’s washer head diameter, up to 29.4 mm (1-3/16”) at its largest
  • 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
  • Counter Thread Tip cuts the wood and pushes it aside
  • Suitable for ledger board to rim joist connections, and ledger board to stud wall connections
  • Ideal for Cross Laminated Timber (CLT) panel-to-panel connections 
  • Can be used in Timber Concrete Composite systems
  • For more connection examples and information see our Design Guides

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

Specifications

Specifications


SpecificationASSY SKThread LengthAW Drive BitPackaging Qty.
# ItemMaterialHead Typein.mmin.mm
[3] SK0650Hardened SteelWasher Head1/4" x 2"6 x 501 3/4"45AW 30100
[3] SK0660Hardened SteelWasher Head1/4" x 2 3/8"6 x 601 1/2"37AW 30100
[3] SK0670Hardened SteelWasher Head1/4" x 2 3/4"6 x 701 5/8"42AW 30100
[3] SK0680Hardened SteelWasher Head1/4" x 3 1/8"6 x 802"50AW 30100
[3] SK0690Hardened SteelWasher Head1/4" x 3 1/2"6 x 902"50AW 30100
[3] SK06100Hardened SteelWasher Head1/4" x 4"6 x 1002 3/8"60AW 30100
[3] SK06120Hardened SteelWasher Head1/4" x 4 3/4"6 x 1202 3/4"70AW 30100
[3] SK06140Hardened SteelWasher Head1/4" x 5 1/2"6 x 1402 3/4"70AW 30100
[3] SK06160Hardened SteelWasher Head1/4" x 6 1/4"6 x 1602 3/4"70AW 30100
[3] SK06180Hardened SteelWasher Head1/4" x 7 1/8"6 x 1802 3/4"70AW 30100
[3] SK06200Hardened SteelWasher Head1/4" x 7 7/8"6 x 2002 3/4"70AW 30100
[3] SK06220Hardened SteelWasher Head1/4" x 8 5/8"6 x 2202 3/4"70AW 30100
[3] SK06240Hardened SteelWasher Head1/4" x 9 1/2"6 x 2402 3/4"70AW 30100
[3] SK06260Hardened SteelWasher Head1/4" x 10 1/4"6 x 2602 3/4"70AW 30100
[3] SK06280Hardened SteelWasher Head1/4" x 11"6 x 2802 3/4"70AW 30100
[3] SK06300Hardened SteelWasher Head1/4" x 11 7/8"6 x 3002 3/4"70AW 30100
[3] SK0860Hardened SteelWasher Head5/16" x 2 3/8"8 x 602"50AW 4050
[3] SK0880Hardened SteelWasher Head5/16" x 3 1/8"8 x 802"50AW 4050
[3] SK08100Hardened SteelWasher Head5/16" x 4"8 x 1002 3/8"60AW 4050
[3] SK08120Hardened SteelWasher Head5/16" x 4 3/4"8 x 1203 1/8"80AW 4050
[3] SK08140Hardened SteelWasher Head5/16" x 5 1/2"8 x 1403 1/8"80AW 4050
[3] SK08160Hardened SteelWasher Head5/16" x 6 1/4"8 x 1603 1/8"80AW 4050
[3] SK08180Hardened SteelWasher Head5/16" x 7 1/8"8 x 1803 1/8"80AW 4050
[3] SK08200Hardened SteelWasher Head5/16" x 7 7/8"8 x 2003 1/8"80AW 4050
[3] SK08220Hardened SteelWasher Head5/16" x 8 5/8"8 x 2204"100AW 4050
[3] SK08240Hardened SteelWasher Head5/16" x 9 1/2"8 x 2404"100AW 4050
[3] SK08260Hardened SteelWasher Head5/16" x 10 1/4"8 x 2604"100AW 4050
[3] SK08280Hardened SteelWasher Head5/16" x 11"8 x 2804"100AW 4050
[3] SK08300Hardened SteelWasher Head5/16" x 11 7/8"8 x 3004"100AW 4050
[3] SK08320Hardened SteelWasher Head5/16" x 12 5/8"8 x 3204"100AW 4050
[3] SK08340Hardened SteelWasher Head5/16" x 13 3/8"8 x 3404"100AW 4050
[3] SK08360Hardened SteelWasher Head5/16" x 14 1/4"8 x 3604"100AW 4050
[3] SK08380Hardened SteelWasher Head5/16" x 15"8 x 3804"100AW 4050
[3] SK08400Hardened SteelWasher Head5/16" x 15 3/4"8 x 4004"100AW 4050
[3] SK08420Hardened SteelWasher Head5/16" x 16 1/2"8 x 4204"100AW 4050
[3] SK08440Hardened SteelWasher Head5/16" x 17 1/4"8 x 4404"100AW 4050
[3] SK08480Hardened SteelWasher Head5/16" x 19"8 x 4804"100AW 4025
[3] SK08520Hardened SteelWasher Head5/16" x 20 1/2"8 x 5204"100AW 4025
[3] SK10100Hardened SteelWasher Head3/8" x 4"10 x 1002 3/8"60AW 5050
[3] SK10120Hardened SteelWasher Head3/8" x 4 3/4"10 x 1203 1/8"80AW 5050
[3] SK10140Hardened SteelWasher Head3/8" x 5 1/2"10 x 1403 1/8"80AW 5050
[3] SK10160Hardened SteelWasher Head3/8" x 6 1/4"10 x 1604"100AW 5050
[3] SK10180Hardened SteelWasher Head3/8" x 7 1/8"10 x 1804"100AW 5050
[3] SK10200Hardened SteelWasher Head3/8" x 7 7/8"10 x 2004"100AW 5050
[3] SK10220Hardened SteelWasher Head3/8" x 8 5/8"10 x 2204"100AW 5050
[3] SK10240Hardened SteelWasher Head3/8" x 9 1/2"10 x 2404"100AW 5050
[3] SK10260Hardened SteelWasher Head3/8" x 10 1/4"10 x 2604"100AW 5050
[3] SK10280Hardened SteelWasher Head3/8" x 11"10 x 2804"100AW 5050
[3] SK10300Hardened SteelWasher Head3/8" x 11 7/8"10 x 3004"100AW 5050
[3] SK10320Hardened SteelWasher Head3/8" x 12 5/8"10 x 3204 3/4"120AW 5050
[3] SK10340Hardened SteelWasher Head3/8" x 13 3/8"10 x 3404 3/4"120AW 5050
[3] SK10360Hardened SteelWasher Head3/8" x 14 1/4"10 x 3604 3/4"120AW 5050
[3] SK10380Hardened SteelWasher Head3/8" x 15"10 x 3804 3/4"120AW 5050
[3] SK10400Hardened SteelWasher Head3/8" x 15 3/4"10 x 4004 3/4"120AW 5050
[3] SK10460Hardened SteelWasher Head3/8" x 18 1/8"10 x 4604 3/4"120AW 5025
[3] SK12200Hardened SteelWasher Head1/2" x 7 7/8"12 x 2004"100AW 5025
[3] SK12220Hardened SteelWasher Head1/2" x 8 5/8"12 x 2204 3/4"120AW 5025
[3] SK12240Hardened SteelWasher Head1/2" x 9 1/2"12 x 2404 3/4"120AW 5025
[3] SK12260Hardened SteelWasher Head1/2" x 10 1/4"12 x 2604 3/4"120AW 5025
[3] SK12280Hardened SteelWasher Head1/2" x 11"12 x 2804 3/4"120AW 5025
[3] SK12300Hardened SteelWasher Head1/2" x 11 7/8"12 x 3004 3/4"120AW 5025
[3] SK12320Hardened SteelWasher Head1/2" x 12 5/8"12 x 3204 3/4"120AW 5025
[3] SK12340Hardened SteelWasher Head1/2" x 13 3/8"12 x 3404 3/4"120AW 5025
[3] SK12360Hardened SteelWasher Head1/2" x 14 1/4"12 x 3604 3/4"120AW 5025
[3] SK12380Hardened SteelWasher Head1/2" x 15"12 x 3805 3/4"145AW 5025
[3] SK12400Hardened SteelWasher Head1/2" x 15 3/4"12 x 4005 3/4"145AW 5025
[3] SK12440Hardened SteelWasher Head1/2" x 17 1/4"12 x 4405 3/4"145AW 5025
[3] SK12480Hardened SteelWasher Head1/2" x 19"12 x 4805 3/4"145AW 5025
[3] SK12520Hardened SteelWasher Head1/2" x 20 1/2"12 x 5205 3/4"145AW 5025
[3] SK12900Hardened SteelWasher Head1/2" x 35 1/2"12 x 9004 3/4"120AW 5025
[3] SK121000Hardened SteelWasher Head1/2" x 39 3/8"12 x 10004 3/4"120AW 5025

CAD Drawings

CAD Drawings

ProductASSY SK DiameterFile Extension
in.mm..DXF
ASSY SK1/4"6
ASSY SK5/16"8
ASSY SK3/8"10
ASSY SK1/2"12
ALL 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

Structural Insulated Panel (SIP) Installation Design

Structural Screw Technology in Tall Wood Buildings

ASSY Screws vs. Lag Bolt

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

Substitution of Lag Screws with Wood Screws

CLT Special Provisions

Designing Timber Concrete Composite Systems (TCC) with ASSY Self-Tapping Screws

4D+ Embedment Reduction Factor for Screws Loaded in Withdrawal

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