Here, UK-based Bison, a nationwide supplier to the M&E and building engineering services marketplace, explains what a non-expansion anchor is and when they should be used.
When fixing into a substrate such as masonry, concrete and blockwork, there’s essentially two main types of anchor; expansion (also known as a mechanical anchor) and non-expansion, and this denomination relates directly to how the anchor actually ‘anchors’ into the substrate. An expansion anchor works through a mechanical movement within the fixing whereupon a wedge shaped internal piece of the anchor is pulled or pushed (depending on the anchor type), forcing the outer part of the anchor against the substrate into which it is inserted.
A non-expansion anchor can be one of two main types, resin or chemical and screw. The second type of anchor - the screw - is quickly becoming the preferred choice for M&E services installation contractors.
How does a screw anchor work?
In short, a screw anchor will do just that, screw and anchor. After drilling a pilot hole, the screw can be driven into the substrate with an impact driver. The ‘relaxed’ thread on the screw enables the screw to be driven straight into dense substrate i.e. concrete. The thread cuts into the side wall of the pilot hole and provides a strong, stable anchor.
Why use one?
There’s several advantages to using screw anchors over mechanical expansion anchors:
What’s a blue tip?
A bluetip concrete screw is a version of the concrete screw that is intended for multiple use. To indicate wear and suitability for further use, the end of the screw is supplied with a blue painted tip; as the screw is used, the paint is worn off and when the majority of the paint is gone, the screw is no longer suitable for use.
Having spent a decade in the fastener industry experiencing every facet – from steel mills, fastener manufacturers, wholesalers, distributors, as well as machinery builders and plating + coating companies, Claire has developed an in-depth knowledge of all things fasteners.
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