Screw Anchors
Self-Tapping Concrete Screws & Bolt Anchors
Screw anchors (concrete screws) are self-tapping fasteners that cut a thread directly into a pre-drilled hole in concrete or masonry. Unlike expansion anchors, screw anchors do not generate radial expansion force -- they rely on the mechanical interlock between the cut thread and the substrate. This makes them suitable for use near edges and in thin concrete members where expansion force could cause splitting.
Screw anchors have gained significant market share in Australian commercial construction due to their speed of installation, removability, and reliable performance in a wide range of substrates. Products like the Hilti HUS3 and Ramset AnkaScrew are commonly used for curtain wall brackets, handrail connections, cable tray supports, and mechanical services mounting.
Testing requirements for screw anchors focus on verifying that the self-tapped thread has achieved adequate engagement in the substrate. Under-drilling (hole too small) can cause installation difficulty and cracking; over-drilling (hole too large) reduces thread engagement and capacity. Proof load testing confirms that the installed screw anchor meets its rated capacity in the specific substrate.
ATA conducts proof load testing for screw anchors in structural and safety-critical applications. Testing is particularly important in lightweight or aged concrete, hollow masonry, and substrates where the drill hole diameter tolerance is critical to anchor performance.
Design of post-installed and cast-in fastenings in concrete
European assessment for concrete screw anchors
Book proof load or ultimate load testing for screw anchors.
Screw Anchors tested by ATA
Products in this category are being added to the library.
Contact ATA about screw anchors testingBook screw anchors testing with ATA
Send your anchor schedule, specification, or project details. ATA will scope the testing programme, define the proof loads, and mobilise to site.