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

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Cylinder Head

Fully Threaded

Tapping Tip

Wood Reinforcement

Product Description

Product Description

The ASSY VG Cyl (Cylinder Head) screw is a fully threaded self-tapping wood screw engineered for timber reinforcement, beam repair, and connections where a small head is required for a clean, concealed, architectural finish.

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



Diameters1/4″ (6 mm) , 5/16″ (8 mm) , 3/8″ (10 mm)
Lengths3-1/8″ (80 mm)  to  31-1/2” (800 mm)
  • Small cylindrical head almost invisible when installed
  • Easily concealable with a wood plug
  • Zinc coating designed for dry service condition
  • Aggressive drill tip mimics a drill bit and bites into the wood and assures quick and easy installation
  • Ideal for incline wood-to-wood connections and wood reinforcement
  • Can be used in Timber Concrete Composite systems, potentially replacing ASSY VG CSK
  • 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 makes the ASSY VG Cyl suitable for a broad range of projects from log home building to multi-story mass timber construction. The ASSY VG Cyl screw can also be used in beam upgrades and connections where a small screw head is required. 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 our Timber Reinforcement Guide.



SpecificationASSY VG CYL   Thread Length AW Drive BitPackaging Qty.
# ItemMaterialHead
CYL0680Hardened SteelCylinder Head1/4" x 3 1/8"6 x 802 7/8"73RW 30100
CYL06100Hardened SteelCylinder Head1/4" x 4"6 x 1003 5/8"93RW 30100
CYL06120Hardened SteelCylinder Head1/4" x 4 3/4"6 x 1204 1/2"113RW 30100
CYL06140Hardened SteelCylinder Head1/4" x 5 1/2"6 x 1405 1/4"133RW 30100
CYL06160Hardened SteelCylinder Head1/4" x 6 1/4"6 x 1606"153RW 30100
CYL06180Hardened SteelCylinder Head1/4" x 7 1/8"6 x 1806 3/4"173RW 30100
CYL06200Hardened SteelCylinder Head1/4" x 7 7/8"6 x 2007 5/8"193RW 30100
CYL08120Hardened SteelCylinder Head5/16" x 4 3/4"8 x 1204"104RW 4050
CYL08140Hardened SteelCylinder Head5/16" x 5 1/2"8 x 1404 7/8"124RW 4050
CYL08160Hardened SteelCylinder Head5/16" x 6 1/4"8 x 1605 5/8"144RW 4050
CYL08180Hardened SteelCylinder Head5/16" x 7 1/8"8 x 1806 1/2"164RW 4050
CYL08200Hardened SteelCylinder Head5/16" x 7 7/8"8 x 2007 1/4"184RW 4075
CYL08220Hardened SteelCylinder Head5/16" x 8 5/8"8 x 2208"204RW 4075
CYL08240Hardened SteelCylinder Head5/16" x 9 1/2"8 x 2408 7/8"224RW 4075
CYL08260Hardened SteelCylinder Head5/16" x 10 1/4"8 x 2609 5/8"244RW 4075
CYL08280Hardened SteelCylinder Head5/16" x 11"8 x 28010 3/8"264RW 4075
CYL08300Hardened SteelCylinder Head5/16" x 11 7/8"8 x 30011 1/8"284RW 4075
CYL08330Hardened SteelCylinder Head5/16" x 13"8 x 33012 3/8"314RW 4050
CYL08360Hardened SteelCylinder Head5/16" x 14 1/4"8 x 36013 1/2"344RW 4050
CYL08380Hardened SteelCylinder Head5/16" x 15"8 x 38014 3/8"364RW 4050
CYL08430Hardened SteelCylinder Head5/16" x 17"8 x 43016 1/4"414RW 4025
CYL08480Hardened SteelCylinder Head5/16" x 19"8 x 48018 1/4"464RW 4025
CYL08530Hardened SteelCylinder Head5/16" x 20 7/8"8 x 53020 1/4"514RW 4025
CYL08580Hardened SteelCylinder Head5/16" x 22 7/8"8 x 58022 1/4"564RW 4025
CYL10180Hardened SteelCylinder Head3/8" x 7 1/8"10 x 1806 1/2"165RW 5050
CYL10200Hardened SteelCylinder Head3/8" x 7 7/8"10 x 2007 1/4"185RW 5050
CYL10220Hardened SteelCylinder Head3/8" x 8 5/8"10 x 2208 1/8"205RW 5050
CYL10240Hardened SteelCylinder Head3/8" x 9 1/2"10 x 2408 7/8"225RW 5050
CYL10260Hardened SteelCylinder Head3/8" x 10 1/4"10 x 2609 5/8"245RW 5050
CYL10280Hardened SteelCylinder Head3/8" x 11"10 x 28010 3/8"265RW 5050
CYL10300Hardened SteelCylinder Head3/8" x 11 7/8"10 x 30011 1/4"285RW 5050
CYL10320Hardened SteelCylinder Head3/8" x 12 5/8"10 x 32012"305RW 5050
CYL10340Hardened SteelCylinder Head3/8" x 13 3/8"10 x 34012 3/4"325RW 5050
CYL10360Hardened SteelCylinder Head3/8" x 14 1/4"10 x 36013 5/8"345RW 5050
CYL10380Hardened SteelCylinder Head3/8" x 15"10 x 38014 3/8"365RW 5050
CYL10400Hardened SteelCylinder Head3/8" x 15 3/4"10 x 40015 1/8"385RW 5050
CYL10430Hardened SteelCylinder Head3/8" x 17"10 x 43016 3/8"415RW 5025
CYL10480Hardened SteelCylinder Head3/8" x 19"10 x 48018"456RW 5025
CYL10530Hardened SteelCylinder Head3/8" x 20 7/8"10 x 53019 7/8"506RW 5025
CYL10580Hardened SteelCylinder Head3/8" x 22 7/8"10 x 58021 7/8"556RW 5025
CYL10650Hardened SteelCylinder Head3/8" x 25 5/8"10 x 65024 5/8"626RW 5025
CYL10700Hardened SteelCylinder Head3/8" x 27 5/8"10 x 70026 5/8"676RW 5025
CYL10750Hardened SteelCylinder Head3/8" x 29 1/2"10 x 75028 5/8"726RW 5025
CYL10800Hardened SteelCylinder Head3/8" x 31 1/2"10 x 80030 1/2"776RW 5025
CAD Drawings

CAD Drawings

ProductASSY VG CYL DiameterFile Extension
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 3178 for Fully Threaded Screws - 2022 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

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

Purlin to Beam Connections Using ASSY Fully Threaded Fasteners

Roof-to-Wall Connections (Truss Uplift)

ASSY Screws vs. Lag Bolt

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

4D+ Embedment Reduction Factor for Screws Loaded in Withdrawal

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