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

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Countersunk Head

Fully Threaded

Tapping Tip

Product Description

Product Description

The ASSY VG CSK (Countersunk Head) screw is a fully threaded timber connector suitable for timber reinforcement, wood-to-wood connections, and steel-to-wood connections. The ASSY VG CSK can be used with both the 90° and 45° wedge washer.

Code-approved reliability, the ASSY VG CSK screw has been awarded an ICC-ESR approval in the United States and the Canadian Construction Materials Centre Reports (CCMC) approval in Canada.  



Diameters5/16″ (8 mm) , 3/8″ (10 mm) , 1/2″ (12 mm)
Lengths3-1/8″ (80 mm)  to  31-1/2” (800 mm)
  • Versatile countersunk head with milling pockets for a clean architectural finish
  • Aggressive drill tip mimics a drill bit and bites into the wood and assures quick and easy installation
  • Used with the RICON S VS and MEGANT beam hanger connectors. 
  • Ideal for incline wood-to-wood connections and wood reinforcement
  • Can be used with both the 90° and 45° wedge washer
  • Can be used in Timber Concrete Composite systems, potentially replacing ASSY VG Cyl
  • For more connection examples and information see our Design Guides
  • Recommended for lifting in conjunction with the Yoke systems and steel-to-wood connections
  • 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 makes the ASSY VG CSK suitable for a broad range of projects from log home building to multi-story mass timber construction. The ASSY VG CSK screw can also be used in beam upgrades and steel-to-wood connections. ASSY fully threaded screws can be used in typical reinforcing applications, including checked or cracked members, potentially restoring them to nearly their full original strength following ourTimber Reinforcement Guide.



SpecificationASSY VG CSKThread LengthAW Drive BitPackaging Qty.
# ItemMaterialHead
CSK0880Hardened SteelCountersunk Head5/16" x 3 1/8"8 x 802 1/2"61AW 4075
CSK08120Hardened SteelCountersunk Head5/16" x 4 3/4"8 x 1204"103AW 4075
CSK08140Hardened SteelCountersunk Head5/16" x 5 1/2"8 x 1404 7/8"123AW 4075
CSK08160Hardened SteelCountersunk Head5/16" x 6 1/4"8 x 1605 5/8"143AW 4075
CSK08180Hardened SteelCountersunk Head5/16" x 7 1/8"8 x 1806 3/8"163AW 4075
CSK08200Hardened SteelCountersunk Head5/16" x 7 7/8"8 x 2007 1/4"183AW 4075
CSK08220Hardened SteelCountersunk Head5/16" x 8 5/8"8 x 2208"203AW 4075
CSK08240Hardened SteelCountersunk Head5/16" x 9 1/2"8 x 2408 3/4"223AW 4075
CSK08260Hardened SteelCountersunk Head5/16" x 10 1/4"8 x 2609 5/8"243AW 4075
CSK08280Hardened SteelCountersunk Head5/16" x 11"8 x 28010 3/8"263AW 4075
CSK08300Hardened SteelCountersunk Head5/16" x 11 7/8"8 x 30011 1/8"283AW 4075
CSK10100Hardened SteelCountersunk Head3/8" x 4"10 x 1003"77AW 5050
CSK10140Hardened SteelCountersunk Head3/8" x 5 1/2"10 x 1404 7/8"125AW 5050
CSK10160Hardened SteelCountersunk Head3/8" x 6 1/4"10 x 1605 3/4"145AW 5050
CSK10180Hardened SteelCountersunk Head3/8" x 7 1/8"10 x 1806 1/2"165AW 5050
CSK10200Hardened SteelCountersunk Head3/8" x 7 7/8"10 x 2007 1/4"185AW 5050
CSK10220Hardened SteelCountersunk Head3/8" x 8 5/8"10 x 2208 1/8"205AW 5050
CSK10240Hardened SteelCountersunk Head3/8" x 9 1/2"10 x 2408 7/8"225AW 5050
CSK10260Hardened SteelCountersunk Head3/8" x 10 1/4"10 x 2609 5/8"245AW 5050
CSK10280Hardened SteelCountersunk Head3/8" x 11"10 x 28010 3/8"265AW 5050
CSK10300Hardened SteelCountersunk Head3/8" x 11 7/8"10 x 30011 1/4"285AW 5050
CSK10320Hardened SteelCountersunk Head3/8" x 12 5/8"10 x 32012"305AW 5050
CSK10340Hardened SteelCountersunk Head3/8" x 13 3/8"10 x 34012 3/4"325AW 5050
CSK10360Hardened SteelCountersunk Head3/8" x 14 1/4"10 x 36013 5/8"345AW 5050
CSK10380Hardened SteelCountersunk Head3/8" x 15"10 x 38014 3/8"365AW 5050
CSK10400Hardened SteelCountersunk Head3/8" x 15 3/4"10 x 40015 1/8"385AW 5050
CSK10430Hardened SteelCountersunk Head3/8" x 16 7/8"10 x 43016 3/8"415AW 5025
CSK10480Hardened SteelCountersunk Head3/8" x 19"10 x 48018 1/4"465AW 5025
CSK10530Hardened SteelCountersunk Head3/8" x 20 7/8"10 x 53020 1/8"512AW 5025
CSK10580Hardened SteelCountersunk Head3/8" x 22 7/8"10 x 58022 1/8"562AW 5025
CSK10650Hardened SteelCountersunk Head3/8" x 25 5/8"10 x 65024 7/8"632AW 5025
CSK10700Hardened SteelCountersunk Head3/8" x 27 5/8"10 x 70026 7/8"682AW 5025
CSK10750Hardened SteelCountersunk Head3/8" x 29 1/2"10 x 75028 7/8"732AW 5025
CSK10800Hardened SteelCountersunk Head3/8" x 31 1/2"10 x 80030 3/4"782AW 5025
CSK12120Hardened SteelCountersunk Head1/2" x 4 3/4"12 x 1204 1/8"105AW 5050
CSK12140Hardened SteelCountersunk Head1/2" x 5 1/2"12 x 1404 7/8"125AW 5050
CSK12160Hardened SteelCountersunk Head1/2" x 6 1/4"12 x 1605 3/4"145AW 5050
CSK12180Hardened SteelCountersunk Head1/2" x 7 1/8"12 x 1806 1/2"165AW 5050
CSK12200Hardened SteelCountersunk Head1/2" x 7 7/8"12 x 2007 1/4"185AW 5050
CSK12220Hardened SteelCountersunk Head1/2" x 8 5/8"12 x 2208 1/8"205AW 5050
CSK12240Hardened SteelCountersunk Head1/2" x 9 1/2"12 x 2408 7/8"225AW 5050
CSK12260Hardened SteelCountersunk Head1/2" x 10 1/4"12 x 2609 5/8"245AW 5050
CSK12280Hardened SteelCountersunk Head1/2" x 11"12 x 28010 3/8"265AW 5050
CSK12300Hardened SteelCountersunk Head1/2" x 11 7/8"12 x 30011 1/4"285AW 5050
CSK12380Hardened SteelCountersunk Head1/2" x 15"12 x 38014 3/8"365AW 5050
CSK12480Hardened SteelCountersunk Head1/2" x 19"12 x 48018 1/4"465AW 5025
CSK12600Hardened SteelCountersunk Head1/2" x 23 5/8"12 x 60023"58525

CAD Drawings

CAD Drawings

ProductASSY VG CSK DiameterFile Extension
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 3178 for Fully Threaded Screws - 2021 Edition

CCMC Code Approval 13677-R

ISO 50001 Certification for ASSY Fasteners

LA Research Report (LARR): RR 26072

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 Reinforcement Guide

Notch Reinforcement Design USA

Design for Reinforcement of Perpendicular to Grain Connection

Purlin to Beam Connections Using ASSY Fully Threaded Fasteners

Steel to CLT Lateral Connections

ASSY Screws vs. Lag Bolt

Screw Withdrawal Resistance in Near-Edge Applications

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

CLT Special Provisions

4D+ Embedment Reduction Factor for Screws Loaded in Withdrawal

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