Screw AS3566 refers to self-drilling screws manufactured and specified in accordance with the AS 3566 series of standards for building and construction applications. These screws are widely associated with roofing, wall cladding, steel framing and other applications where reliable fastening and appropriate corrosion resistance are important.
Choosing the correct AS3566 screw involves more than selecting a screw by size. The screw type, material, coating, corrosion environment, substrate and application all need to be considered.
At Boltility, we supply a range of self-drilling and construction fastening solutions for different project requirements.
What Is a Screw AS3566?
A Screw AS3566 is a self-drilling screw covered by the AS 3566 standard series.
AS 3566.1 specifies general requirements and mechanical properties for self-drilling screws used in building and construction, including screws for drilling and tapping into steel and screws used for fixing to timber. AS 3566.2 addresses corrosion resistance and the selection of self-drilling screws for appropriate environmental conditions, particularly in roofing and cladding applications.
This means AS3566 is not simply a brand or a particular screw shape. It is a standard used to specify performance requirements for self-drilling screws.
Why Choose AS3566 Screws?
Using an appropriately specified AS3566 screw can provide several advantages for construction and building projects.
Reliable Self-Drilling Performance
Self-drilling screws are designed with a drilling point that allows the screw to penetrate suitable metal substrates without a separate pre-drilling operation in applications where the screw’s capacity and substrate thickness permit it.
Suitable for Construction Applications
AS 3566 self-drilling screws are designed for building and construction applications, including steel and timber fastening applications covered by the standard.
Corrosion Resistance
Corrosion resistance is an important consideration when selecting screws for external construction applications. AS 3566.2 specifies requirements relating to corrosion resistance and environmental selection for self-drilling screws used in roofing and cladding.
Faster Installation
Because a self-drilling screw can drill its own hole in suitable applications, installation can be faster than using a conventional screw that requires a separate pilot hole.
AS 3566 Screw Standards Explained
Understanding the AS 3566 series helps when choosing the correct Screw AS3566 for a project.
AS 3566.1 – General Requirements and Mechanical Properties
AS 3566.1 covers the general requirements and mechanical properties of self-drilling screws used in building and construction.
It includes requirements relating to dimensions, thread forms, lead types, mechanical properties and performance requirements. The standard covers screws used for drilling and tapping into steel, fixing to timber and certain plasterboard-to-steel applications.
AS 3566.2 – Corrosion Resistance
AS 3566.2 focuses on corrosion resistance and environmental selection for self-drilling screws used in roofing and cladding.
The current AS 3566.2:2025 edition specifies requirements for corrosion resistance and selection according to the appropriate environment, including requirements for associated sealing washers.
Therefore, when someone searches for AS3566 screws, it is important to consider both the mechanical requirements and the corrosion environment.
AS3566 Screw Corrosion Resistance
The correct corrosion-resistant screw depends on the environment where it will be installed.
Factors to consider include:
- Indoor or outdoor exposure
- Moisture
- Humidity
- Coastal or marine exposure
- Industrial pollutants
- Roofing application
- Cladding application
- Contact with treated timber
- Expected service conditions
A screw suitable for an internal dry environment may not be appropriate for an exposed or corrosive environment.
For this reason, choosing an AS3566 screw coating should be based on the actual project environment rather than simply selecting the highest or lowest coating class.
AS3566 Class 3 Screws
AS3566 Class 3 screws are commonly associated with applications requiring a higher level of corrosion protection than standard internal fasteners.
They may be considered for certain moderate-exposure applications, subject to the applicable standard and project requirements.
AS3566 Class 4 Screws
AS3566 Class 4 screws provide a higher level of corrosion resistance for more demanding environments.
They are commonly associated with external roofing and cladding applications where increased corrosion resistance is required.
The appropriate class should always be selected according to the applicable AS 3566 requirements and the actual environmental exposure.
Types of AS3566 Screws
The appropriate Screw AS3566 configuration depends on the application and substrate.
Hex Head AS3566 Screws
Hex head self-drilling screws provide a practical driving configuration for many construction and roofing applications.
They are commonly used where a secure mechanical drive is required and may be supplied with sealing washers for suitable roofing and cladding applications.
Countersunk AS3566 Screws
Countersunk self-drilling screws are designed where a more flush screw head is preferred.
They may be useful in applications where the appearance or finished surface is important, subject to the specific screw design and substrate.
Bi-Metal AS3566 Screws
Bi-metal screws combine different metals within the screw construction to provide a combination of drilling performance, strength and corrosion resistance.
For example, a stainless-steel body can be combined with a hardened carbon-steel drilling point.
Boltility’s product range includes bi-metal screws with an AS3566 Class 3 coating, such as the CSK Head Bi-Metal Steel 304 + Carbon Steel screw.
Where Are AS3566 Screws Used?
AS 3566 self drilling screws can be used across a variety of building and construction applications.
Roofing
Self-drilling screws are widely used to secure roofing materials to suitable steel or timber substrates.
For roofing applications, screw selection should consider the roof material, supporting structure, washer/sealing requirements and environmental exposure.
Wall Cladding
AS3566 screws can be used for suitable metal wall cladding applications where the selected screw meets the required mechanical and corrosion-resistance requirements.
Steel Framing
Self-drilling screws can be used for connecting suitable steel framing components.
The screw must be selected according to the steel thickness, connection requirements and applicable project specifications.
Metal Sheets
Self-drilling screws provide an efficient method for fastening suitable metal sheets and components.
Timber Applications
Certain self-drilling screws covered by AS 3566 are intended for fastening to timber.
The screw length, thread configuration and corrosion protection should be appropriate for the timber and environmental conditions.
Construction and Fabrication
AS3566 screws can also be used in suitable fabrication and construction applications where self-drilling fastening is required.
How to Choose the Right Screw AS3566
Selecting the right Screw AS3566 requires more than choosing the correct diameter.
1. Identify the Substrate
First determine whether you are fastening into:
- Steel
- Light-gauge steel
- Structural steel
- Timber
- Metal roofing
- Metal cladding
- Another approved substrate
The screw’s drilling capacity and mechanical properties need to be suitable for the substrate.
2. Check Material Thickness
The thickness of the material affects the appropriate screw point, drilling capacity and thread engagement.
Always check the manufacturer’s technical information before installation.
3. Select the Correct Screw Length
The screw must provide sufficient engagement with the supporting material without creating unnecessary penetration.
4. Consider Corrosion Exposure
For external and exposed applications, corrosion resistance is a critical consideration.
Choose the appropriate AS 3566 corrosion classification based on the environment and project specification.
5. Choose the Correct Head
Select the head configuration according to the installation and finished appearance requirements.
Common options include hex head and countersunk configurations.
6. Consider the Washer
For roofing and cladding, a suitable sealing washer may be required to help prevent water penetration around the fixing point.
AS 3566.2:2025 specifically includes specifications for associated sealing washers used with relevant self-drilling screws for roofing and cladding.
7. Check Manufacturer Requirements
Always check the manufacturer’s technical specifications for drilling capacity, recommended installation method, substrate compatibility and corrosion classification.
Screw AS3566 vs Standard Self Drilling Screws
Not every self-drilling screw should automatically be described as an AS3566 screw.
The AS 3566 series establishes specific requirements for self-drilling screws used in building and construction.
When comparing an AS3566 screw with a generic self-drilling screw, consider:
| Feature | AS3566 Screw | Generic Self-Drilling Screw |
|---|---|---|
| Standard reference | AS 3566 series | May vary |
| Mechanical requirements | Specified by applicable standard | Manufacturer dependent |
| Corrosion requirements | Addressed by AS 3566.2 where applicable | May vary |
| Construction applications | Covered applications | Depends on product |
| Environmental selection | Considered under applicable corrosion requirements | Depends on coating/product |
The important point is that AS3566 is a standards-based specification, not simply a marketing description for any self-drilling screw.
AS3566 Screws for Roofing and Cladding
Roofing and cladding projects require particular attention to corrosion resistance because fasteners can be exposed to moisture and changing environmental conditions.
A suitable roofing screw should be selected according to:
- Roofing material
- Supporting structure
- Steel or timber substrate
- Screw diameter
- Screw length
- Drilling capacity
- Corrosion environment
- Washer/sealing requirements
- Manufacturer specifications
AS 3566.2:2025 specifically addresses corrosion resistance and environmental selection for self-drilling screws used in roofing and cladding.
Common Mistakes When Choosing AS3566 Screws
Choosing by Size Alone
A screw that has the correct diameter and length may still be unsuitable for the environmental conditions.
Ignoring Corrosion Exposure
External, coastal or industrial environments can require greater corrosion protection than internal applications.
Using the Wrong Drilling Capacity
The screw’s drilling capacity must match the thickness and type of material being drilled.
Using an Incorrect Washer
For roofing and cladding, the washer and sealing system are important parts of the fastening assembly.
Assuming Every Self-Drilling Screw Is AS3566
A generic self-drilling screw should not be described as AS3566 unless its compliance with the relevant requirements has been established.
Installation Tips for AS3566 Screws
For best results, always follow the manufacturer’s installation instructions.
Important considerations include:
- Use the correct driver or bit
- Maintain the appropriate installation angle
- Avoid over-driving the screw
- Avoid damaging the screw head
- Ensure the washer is seated correctly
- Do not compromise the roof or cladding surface
- Use the recommended installation speed
- Check drilling capacity before installation
- Follow project specifications
Incorrect installation can affect the performance of the screw and the overall fastening system.
Why Choose Boltility for AS3566 Screws?
Boltility supplies fastening solutions for construction, engineering, roofing and other industrial applications.
Our range includes self-drilling screws and specialised fasteners designed for different substrates, environments and installation requirements.
If you need Screw AS3566 for roofing, cladding, steel, timber or another construction application, our team can help you identify a suitable product based on your project requirements.
Frequently Asked Questions About Screw AS3566
What is a Screw AS3566?
A Screw AS3566 is a self-drilling screw covered by the AS 3566 series of Australian standards for building and construction applications.
What is AS3566 used for?
AS 3566 covers self-drilling screws used in building and construction, including applications involving steel and timber. AS 3566.2 addresses corrosion resistance and environmental selection for relevant roofing and cladding screws.
Are AS3566 screws self-drilling?
Yes. The AS 3566 series covers self-drilling screws for specified building and construction applications.
What is AS 3566.1?
AS 3566.1 covers general requirements and mechanical properties for self-drilling screws used in building and construction.
What is AS 3566.2?
AS 3566.2 covers corrosion resistance requirements and environmental selection for applicable self-drilling screws used in roofing and cladding. The current edition is AS 3566.2:2025.
What are AS3566 Class 3 screws?
AS3566 Class 3 refers to a corrosion-resistance classification used for applicable self-drilling screws. The correct classification depends on the applicable requirements and environmental exposure.
What are AS3566 Class 4 screws?
AS3566 Class 4 refers to a higher corrosion-resistance classification for applicable self-drilling screws. The appropriate classification should be selected according to the project environment and applicable requirements.
Can AS3566 screws be used for roofing?
AS 3566 includes self-drilling screws used in roofing and cladding, with AS 3566.2 specifically addressing corrosion resistance and environmental selection for relevant roofing and cladding fasteners.
Can AS3566 screws be used outdoors?
Some AS3566 screws are designed for external applications, but the appropriate corrosion classification must be selected according to the environment and project requirements.
How do I choose the right AS3566 screw?
Consider the substrate, material thickness, screw length, drilling capacity, head type, corrosion exposure, washer requirements and manufacturer’s technical specifications.
Buy Screw AS3566 in Singapore
Looking for Screw AS3566 for a construction, roofing, cladding or engineering project?
Boltility provides self-drilling screws and fastening solutions for different applications and environmental requirements.
Contact Boltility to discuss your required screw size, substrate, coating, quantity and application.
Choose the right AS3566 self-drilling screw for your project with the right combination of mechanical performance, corrosion resistance and application suitability.