10G x 25mm Class 4 Galvanised Tek Screws | AS3566 Compliant
Looking for reliable, high-performance Hex Tek Screws in Australia? Our 10G x 25mm Class 4 Galvanised Tek Screws are engineered for strength, exceptional corrosion resistance, and fast, hassle-free installation into steel sections. Trusted by builders, contractors, and landscapers nationwide, these self-drilling screws are the professional's top choice for securing greenhouse frames, purlins, arches, roofing, cladding, and a wide range of structural projects.
Designed to meet the stringent Australian Standard AS3566, these screws provide exceptional performance in harsh outdoor environments, including coastal and industrial areas. The Class 4 galvanised coating offers maximum corrosion protection, ensuring the longevity and integrity of your build. Each screw features a hex washer head for easy installation with a standard nutsetter, delivering excellent torque control with a reduced risk of cam-out.
Best For
Professionals and serious DIYers requiring AS3566 compliant, corrosion-resistant fasteners for critical metal-to-metal connections in outdoor and structural applications.
Key Features
- AS3566 Compliant - Manufactured to meet the stringent Australian Standard for self-drilling screws, guaranteeing quality and performance you can trust.
- Class 4 Galvanised Protection - Features a superior galvanised finish that provides maximum resistance to corrosion, making it ideal for harsh environments, including coastal areas.
- Self-Drilling Tek Point - The integrated drill point (6.2mm length) eliminates the need for pre-drilling, cutting through steel cleanly and efficiently for fast installation.
- Hex Washer Head Design - The 5/16" hex head allows for strong, slip-free drive with a nutsetter, while the bonded washer helps create a weather-tight seal.
- High-Strength Carbon Steel - Hardened for durability and a secure, vibration-resistant hold in steel applications.
Product Specifications
- Quantity: 500
- Screw Gauge: 10G
- Length: 25mm
- Thread Length: 18.8mm
- Drill Point Length: 6.2mm
- Shank Diameter: 4.8mm
- Head Diameter: 11mm
- Finish: Class 4 Galvanised
- Material: Hardened Carbon Steel
- Driver Type: 5/16" Hex (Nutsetter)
- Point Type: Tek Metal Self Drill
- Head Type: Hex Washer Head
Ideal Applications
- Greenhouse & Shade House Construction - Securing frames, purlins, arches, and bracings with a strong, reliable fix.
- Roofing & Wall Cladding - Fastening colourbond or galvanised steel sheeting to steel frames and purlins.
- Structural Steel Framing - Assembling sheds, garages, workshops, and industrial structures where a compliant fastener is required.
- Fencing & Railings - Building robust metal fences and gate frameworks designed to last.
- General Metal Fabrication - The go-to screw for any project involving light to medium gauge steel.
Oversized Item Delivery Options
Since oversized items require special handling, we may need to provide a custom freight quote for your order and will contact you with an updated shipping rate.
Available options include:
✔ Delivery to your closest depot for pickup - default method
✔ Direct delivery - requires forklift on site
✔ Direct delivery with tailgate lift truck (extra fees apply)
✔ Forklift loading at our warehouse (no extra charge if you arrange your own freight)
✔ Direct truck delivery (available in Victoria)
Important Notes:
- Shipping costs vary by location and method
- Because of the forklift requirement, delivery to the nearest depot is the default option and will be the method used unless you contact us to request otherwise.
Business Delivery:
- Business delivery is available for commercial customers only
- If you select business delivery and your products are bulky, it is your responsibility to ensure you have appropriate equipment (including forklifts) to unload products from the delivery truck
- If you select business delivery and you are not a business, you risk your product not being delivered and may incur additional fees to retrieve your order
- Business delivery customers must provide a valid business address and contact information
- Additional fees may apply for failed delivery attempts due to lack of appropriate unloading equipment
Let us know your preference, and we'll arrange the best solution for you!
Important Note on Availability & Shipping
Our warehouse serves as our office and logistics centre rather than a retail showroom. Because we ship from multiple locations and manage high-turnover stock, not all items are available for immediate pickup.
Lead Times:
- In-Stock Items: Usually ready for dispatch the same day.
- Supplier-Dependent Items: Can take up to 2 weeks to arrive.
While we strive for fast delivery, some timelines are subject to supplier availability and are beyond our control. We appreciate your patience as we source the best quality gear for your project.
We Offer the Best Prices
We are committed to offering our customers the best prices possible. If you find the exact same product advertised at a lower price elsewhere, we invite you to contact us and we will review your price match request.
Price Match Conditions:
- The competitor must be an Australian-based seller with a physical presence in Australia
- The product must be the exact same item with a matching SKU or model number
- The product must be in stock and available for purchase at the competitor
- The lower price must be publicly advertised and currently available (not a clearance, closeout, or discontinued item)
- Price matching excludes marketplace platforms including but not limited to Temu and Aliexpress
- Price matching requests must be made before purchase
How to Request a Price Match:
To request a price match, please contact us at sales@greenhousepolytunnels.com.au with a link to the competitor's product listing, or call us on 0418 438 774. Please include the product details and the advertised lower price. We will review your request and respond within 2 business days.
Shop
- Choosing a selection results in a full page refresh.


