Reverse Head Fully Threaded Self-Tapping Structural Wood Screw
  • Code Approval
  • ETA
  • Connection Type
  • Wood/Wood , Wood/Steel
  • Applications
  • Mass & Heavy Timber Construction
  • Manufacturer
  • SWG

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Reverse Head

Fully Threaded

Tapping Tip

Wood Reinforcement

Product Description

Product Description

The ASSY VG Reverse Head (RH) screw is a fully threaded self-tapping screw suitable for timber reinforcement.



Diameters9/16″ (14 mm)
Lengths31-1/2” (800 mm)  to  59” (1500 mm)
  • Longest fully threaded wood screw in the world
  • Ideal for large-scale reinforcement projects
  • Engineered small diameter reverse head
  • Easily concealable with a wood plug
  • Aggressive drill tip mimics a drill bit and bites into the wood and assures quick and easy installation
  • 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.

Similar to the VG Cyl, it has a head that is engineered to have the smallest diameter possible. This screw is ideal for large-scale reinforcement projects. The ASSY VG RH 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.

An ASSY Reverse Head Socket drive and ASSY Bit Holder Case are highly recommended for trouble-free installation. 




SpecificationASSY R.H.Thread LengthAW Drive BitPackaging Qty.
# ItemMaterialHead
RH14800Hardened SteelReverse Head9/16" x 31 1/2"14 x 80030 3/4"780Reverse Head Socket15
RH14850Hardened SteelReverse Head9/16" x 33 1/2"14 x 85032 1/2"830Reverse Head Socket15
RH14900Hardened SteelReverse Head9/16" x 35 3/8"14 x 90034 5/8"880Reverse Head Socket15
RH14950Hardened SteelReverse Head9/16" x 37 3/8"14 x 95036 5/8"930Reverse Head Socket15
RH141000Hardened SteelReverse Head9/16" x 39 3/8"14 x 100038 5/8"980Reverse Head Socket15
RH141050Hardened SteelReverse Head9/16" x 41 3/8"14 x 105040 1/2"1030Reverse Head Socket15
RH141100Hardened SteelReverse Head9/16" x 43 1/4"14 x 110042 1/2"1080Reverse Head Socket15
RH141200Hardened SteelReverse Head9/16" x 47 1/4"14 x 120046 1/2"1180Reverse Head Socket15
RH141300Hardened SteelReverse Head9/16" x 51 1/8"14 x 130050 3/8"1280Reverse Head Socket15
RH141400Hardened SteelReverse Head9/16" x 55 1/8"14 x 140054 3/8"1380Reverse Head Socket15
RH141500Hardened SteelReverse Head9/16" x 59"14 x 150058 1/4"1480Reverse Head Socket15
CAD Drawings

CAD Drawings

ProductASSY VG RH DiameterFile Extension
ASSY RH9/16"14
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

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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