Unite wood to steel beam
Wood to steel beam screws
Uniwing screws for fixing timber to steel beams
Our Uniwing range is designed for fastening timber to heavy section steel where you need a clean countersunk finish in the timber and a secure self-drilling connection into the steel. The wing design mills free space in the timber first, then breaks off when it reaches the steel so the thread can grip the beam and complete the installation.
This page stays focused on wood to steel beam applications only. In the range below, you can compare standard and stainless options, check timber-thickness coverage and make sure the screw fits the steel thickness you are drilling into. If you need more help with material choice or drilling range, our guides on corrosion classes, drilling capacity and stainless steel are the most relevant starting points.
Choose the right Uniwing screw for wood to steel beam fixing
Standard Uniwing for low-corrosivity applications
Choose our standard Uniwing screws when you are fixing timber to heavy section steel in lower-corrosivity applications and need a reliable countersunk installation in the timber. The range covers several lengths for different timber sections, while the wing design helps prevent the timber from binding under the head before the thread reaches the steel.
Stainless Uniwing for higher corrosion demands
Use our stainless A2 Uniwing screws when the same timber-to-heavy-section-steel build-up needs a more corrosion-resistant option. This is the better fit when the environment or specification calls for a higher corrosion class, without changing the basic Uniwing installation principle.
Detailed wood to steel beam data in our catalogue
The catalogue page below is the key reference for this product family. It lets you compare standard and stainless Uniwing options, see which timber thickness each designation is intended for, and confirm the drill-capacity span into heavy section steel.
Because this family is very focused, the page stays tight to timber fixed into heavy section steel only. If your substrate is lighter steel rather than a steel beam or other heavy section, that belongs on our separate timber to light section steel page instead.
Need help choosing the right wood to steel beam screw?
If you are unsure about corrosion class, timber thickness or whether the substrate should be treated as heavy section steel, we can help you narrow the right Uniwing designation before you order. We support contractors, fabricators and project buyers who want a fastening that fits the build-up and installation method from the start.
How do I choose between standard and stainless wood to steel beam screws?
Start with the corrosion requirement. Our standard Uniwing screws suit lower-corrosivity applications, while our stainless A2 versions are the better choice when the project calls for a more corrosion-resistant solution. If the environment is unclear, decide that first rather than choosing by length alone.
When should I use this page instead of timber to light section steel screws?
Use this page when the timber is being fixed into heavy section steel, not light section steel. The Uniwing range here is intended for steel thicknesses in the 5.0-12.5 mm span, so if the substrate is lighter than that you should move to the separate timber to light section steel family instead.
Why do the wings on Uniwing matter?
The wings matter because they create clearance in the timber before the thread takes hold in the steel. That helps prevent the timber from being pulled up and locked under the head too early. When the wings reach the steel, they break off and the thread completes the fastening into the beam.
What should I check before choosing screw length?
Check the timber thickness first, then match it to the thickness range shown for the designation you are considering. After that, confirm the steel beam also falls within the screw’s drill-capacity span. This range covers different timber sections, so length choice should always be tied to the actual build-up rather than guessed on site.
Do I need to consider drill capacity separately from timber thickness?
Yes. Timber thickness helps you choose the right length, but drill capacity tells you whether the screw is actually suitable for the steel beam. On this page, the family is built for heavy section steel in the 5.0-12.5 mm range, so both factors must be checked together.
Can Unite help us choose the right option for a project-specific build-up?
Yes. If you are comparing corrosion class, timber thickness or whether the steel should be treated as light or heavy section, we can help you narrow the right Uniwing option before ordering. That is often the fastest way to avoid choosing a screw that is the right length but wrong for the substrate or environment.